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annotate libfreeDiameter/signal.c @ 236:60f34df3e025

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Remove dependency on signalent.h
author Sebastien Decugis <sdecugis@nict.go.jp>
date Mon, 08 Mar 2010 14:10:30 +0900
parents 8773740401a5
children 5df55136361b
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1 /*********************************************************************************************************
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2 * Software License Agreement (BSD License) *
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3 * Author: Sebastien Decugis <sdecugis@nict.go.jp> *
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4 * *
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5 * Copyright (c) 2009, WIDE Project and NICT *
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6 * All rights reserved. *
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7 * *
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8 * Redistribution and use of this software in source and binary forms, with or without modification, are *
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9 * permitted provided that the following conditions are met: *
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10 * *
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11 * * Redistributions of source code must retain the above *
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12 * copyright notice, this list of conditions and the *
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13 * following disclaimer. *
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14 * *
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15 * * Redistributions in binary form must reproduce the above *
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16 * copyright notice, this list of conditions and the *
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17 * following disclaimer in the documentation and/or other *
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18 * materials provided with the distribution. *
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19 * *
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20 * * Neither the name of the WIDE Project or NICT nor the *
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21 * names of its contributors may be used to endorse or *
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22 * promote products derived from this software without *
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23 * specific prior written permission of WIDE Project and *
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24 * NICT. *
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25 * *
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26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED *
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27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
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28 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR *
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29 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT *
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30 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS *
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31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR *
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32 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF *
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33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
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34 *********************************************************************************************************/
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35
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36 #include "libfD.h"
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37
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38 #include <signal.h>
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39
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40 /* A structure to hold the registered signal handlers */
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41 struct sig_hdl {
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42 struct fd_list chain; /* Link in the sig_hdl_list ordered by signal */
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43 int signal; /* The signal this handler is registered for */
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44 void (*sig_hdl)(int);/* The callback to call when the signal is caught */
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45 pthread_t sig_thr; /* The thread that receives the signal */
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46 char *modname; /* The name of the module who registered the signal (for debug) */
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47 };
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48
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49 /* The list of sig_hdl, and the mutex to protect it */
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50 static struct fd_list sig_hdl_list = FD_LIST_INITIALIZER(sig_hdl_list);
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51 static pthread_mutex_t sig_hdl_lock = PTHREAD_MUTEX_INITIALIZER;
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52
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53 /* Detached thread attribute */
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54 static pthread_attr_t detached;
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55
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56 /* Note if the module was initialized */
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57 static int sig_initialized = 0;
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58
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59 /* signals short names list */
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60 static int abbrevs_init(void);
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61
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62 /* Initialize the support for signals */
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63 int fd_sig_init(void)
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64 {
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65 sigset_t sig_all;
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66
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67 TRACE_ENTRY("");
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68
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69 if (sig_initialized)
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70 return 0;
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71
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72 /* Initialize the list of abbreviations */
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73 CHECK_FCT(abbrevs_init());
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74
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75 /* Block all signals from the current thread and all its future children, so that signals are delivered only to our sig_hdl->sig_thr */
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76 sigfillset(&sig_all);
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77 CHECK_POSIX( pthread_sigmask(SIG_BLOCK, &sig_all, NULL) );
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78
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79 /* Initialize the detached attribute */
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80 CHECK_POSIX( pthread_attr_init(&detached) );
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81 CHECK_POSIX( pthread_attr_setdetachstate(&detached, PTHREAD_CREATE_DETACHED) );
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82
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83 sig_initialized++;
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84
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85 /* That's all we have to do here ... */
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86 return 0;
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87 }
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88
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89
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90 /* This thread (created detached) does call the signal handler */
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91 static void * signal_caller(void * arg)
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92 {
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93 struct sig_hdl * me = arg;
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94 char buf[40];
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95
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96 /* Name this thread */
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97 snprintf(buf, sizeof(buf), "cb %d:%s:%s", me->signal, fd_sig_abbrev(me->signal), me->modname);
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98 fd_log_threadname ( buf );
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99
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100 TRACE_ENTRY("%p", me);
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101
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102 /* Call the signal handler */
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103 (*me->sig_hdl)(me->signal);
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104
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105 TRACE_DEBUG(CALL, "Callback completed");
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106
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107 /* Done! */
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108 return NULL;
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109 }
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110
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111 /* This thread "really" receives the signal and starts the signal_caller thread */
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112 static void * signal_catcher(void * arg)
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113 {
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114 struct sig_hdl * me = arg;
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115 sigset_t ss;
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116 char buf[40];
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117
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118 ASSERT(arg);
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119
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120 /* Name this thread */
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121 snprintf(buf, sizeof(buf), "catch %d:%s:%s", me->signal, fd_sig_abbrev(me->signal), me->modname);
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122 fd_log_threadname ( buf );
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123
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124 TRACE_ENTRY("%p", me);
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125
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126 sigemptyset(&ss);
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127 sigaddset(&ss, me->signal);
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128
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129 /* Now loop on the reception of the signal */
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130 while (1) {
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131 int sig;
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132 pthread_t th;
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133
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134 /* Wait to receive the next signal */
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135 CHECK_POSIX_DO( sigwait(&ss, &sig), break );
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136
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137 TRACE_DEBUG(FULL, "Signal %d caught", sig);
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
138
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
139 /* Create the thread that will call the handler */
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
140 CHECK_POSIX_DO( pthread_create( &th, &detached, signal_caller, arg ), break );
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
141 }
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
142
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
143 /* An error occurred... What should we do ? */
236
60f34df3e025 Remove dependency on signalent.h
Sebastien Decugis <sdecugis@nict.go.jp>
parents: 235
diff changeset
144 TRACE_DEBUG(INFO, "!!! ERROR !!! The signal catcher for %d:%s:%s is terminating!", me->signal, fd_sig_abbrev(me->signal), me->modname);
235
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
145
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
146 /* Better way to handle this ? */
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
147 ASSERT(0);
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
148 return NULL;
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
149 }
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
150
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
151 /* Register a new callback to be called on reception of a given signal (it receives the signal as parameter) */
8773740401a5 Centralized signal handlers management in the library
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parents:
diff changeset
152 /* EALREADY will be returned if there is already a callback registered on this signal */
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
153 /* NOTE: the signal handler will be called from a new detached thread */
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
154 int fd_sig_register(int signal, char * modname, void (*handler)(int signal))
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
155 {
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
156 struct sig_hdl * new;
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
157 struct fd_list * next = NULL;
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
158 int matched = 0;
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
159
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
160 TRACE_ENTRY("%d %p %p", signal, modname, handler);
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
161 CHECK_PARAMS( signal && modname && handler && sig_initialized );
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
162
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
163 /* Alloc all memory before taking the lock */
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
164 CHECK_MALLOC( new = malloc(sizeof(struct sig_hdl)) );
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
165 memset(new, 0, sizeof(struct sig_hdl));
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
166 fd_list_init(&new->chain, new);
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
167 new->signal = signal;
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
168 new->sig_hdl = handler;
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
169 CHECK_MALLOC_DO( new->modname = strdup(modname), { free(new); return ENOMEM; } );
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
170
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
171 /* Search in the list if we already have a handler for this signal */
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
172 CHECK_POSIX(pthread_mutex_lock(&sig_hdl_lock));
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
173 for (next = sig_hdl_list.next; next != &sig_hdl_list; next = next->next) {
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
174 struct sig_hdl * nh = (struct sig_hdl *)next;
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
175
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
176 if (nh->signal < signal)
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
177 continue;
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
178 if (nh->signal == signal) {
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
179 matched = 1;
236
60f34df3e025 Remove dependency on signalent.h
Sebastien Decugis <sdecugis@nict.go.jp>
parents: 235
diff changeset
180 TRACE_DEBUG(INFO, "Signal %d (%s) is already registered by module '%s'", signal, fd_sig_abbrev(signal), nh->modname);
235
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
181 }
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
182 break;
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
183 }
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
184 if (!matched)
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
185 /* Insert the new element before the next handle */
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
186 fd_list_insert_before(next, &new->chain);
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
187
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
188 CHECK_POSIX(pthread_mutex_unlock(&sig_hdl_lock));
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
189
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
190 if (matched)
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
191 return EALREADY; /* Already registered... */
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
192
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
193 /* OK, now start the thread */
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
194 CHECK_POSIX( pthread_create( &new->sig_thr, NULL, signal_catcher, new ) );
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
195
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
196 /* All good */
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
197 return 0;
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
198 }
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
199
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
200 /* Dump list of handlers */
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
201 void fd_sig_dump(int level, int indent)
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
202 {
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
203 struct fd_list * li = NULL;
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
204
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
205 if (!TRACE_BOOL(level))
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
206 return;
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
207
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
208
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
209 CHECK_POSIX_DO(pthread_mutex_lock(&sig_hdl_lock), /* continue */);
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
210 if (!FD_IS_LIST_EMPTY(&sig_hdl_list))
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
211 fd_log_debug("%*sList of registered signal handlers:\n", indent, "");
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
212
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
213 for (li = sig_hdl_list.next; li != &sig_hdl_list; li = li->next) {
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
214 struct sig_hdl * h = (struct sig_hdl *)li;
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
215
236
60f34df3e025 Remove dependency on signalent.h
Sebastien Decugis <sdecugis@nict.go.jp>
parents: 235
diff changeset
216 fd_log_debug("%*s - sig %*d (%s) => %p in module %s\n", indent, "", 2, h->signal, fd_sig_abbrev(h->signal), h->sig_hdl, h->modname);
235
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
217 }
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
218 CHECK_POSIX_DO(pthread_mutex_unlock(&sig_hdl_lock), /* continue */);
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
219
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
220 return;
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
221 }
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
222
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
223
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
224 /* Remove a callback */
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
225 int fd_sig_unregister(int signal)
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
226 {
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
227 struct fd_list * li = NULL;
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
228 struct sig_hdl * h = NULL;
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
229
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
230 TRACE_ENTRY("%d", signal);
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
231 CHECK_PARAMS( signal && sig_initialized );
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
232
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
233 /* Search in the list if we already have a handler for this signal */
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
234 CHECK_POSIX(pthread_mutex_lock(&sig_hdl_lock));
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
235 for (li = sig_hdl_list.next; li != &sig_hdl_list; li = li->next) {
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
236 struct sig_hdl * nh = (struct sig_hdl *)li;
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
237
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
238 if (nh->signal < signal)
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
239 continue;
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
240 if (nh->signal == signal) {
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
241 h = nh;
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
242 fd_list_unlink(&h->chain);
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
243 }
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
244 break;
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
245 }
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
246 CHECK_POSIX(pthread_mutex_unlock(&sig_hdl_lock));
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
247
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
248 if (!h)
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
249 return ENOENT;
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
250
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
251 /* Stop the catcher thread */
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
252 CHECK_FCT( fd_thr_term(&h->sig_thr) );
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
253
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
254 /* Free */
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
255 free(h->modname);
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
256 free(h);
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
257
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
258 /* All good */
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
259 return 0;
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
260 }
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
261
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
262 /* Terminate the signal handler thread -- must be called if fd_sig_init was called */
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
263 void fd_sig_fini(void)
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
264 {
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
265 if (!sig_initialized)
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
266 return;
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
267
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
268 /* For each registered handler, stop the thread, free the associated memory */
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
269 CHECK_POSIX_DO(pthread_mutex_lock(&sig_hdl_lock), /* continue */);
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
270 while (!FD_IS_LIST_EMPTY(&sig_hdl_list)) {
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
271 struct sig_hdl * h = (struct sig_hdl *)sig_hdl_list.next;
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
272
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
273 /* Unlink */
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
274 fd_list_unlink(&h->chain);
8773740401a5 Centralized signal handlers management in the library
Sebastien Decugis <sdecugis@nict.go.jp>
parents:
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275
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276 /* Stop the catcher thread */
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277 CHECK_FCT_DO( fd_thr_term(&h->sig_thr), /* continue */ );
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278
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279 /* Free */
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280 free(h->modname);
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281 free(h);
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282 }
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283 CHECK_POSIX_DO(pthread_mutex_unlock(&sig_hdl_lock), /* continue */);
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284
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285 /* Destroy the thread attribute */
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286 CHECK_POSIX_DO( pthread_attr_destroy(&detached), /* continue */ );
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287 return;
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288 }
236
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289
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290
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291 /**************************************************************************************/
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292
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293 static char **abbrevs;
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294 static size_t abbrevs_nr = 0;
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295
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296 /* Initialize the array of signals */
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297 static int abbrevs_init(void)
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298 {
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299 int i;
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300
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301 #define SIGNAL_MAX_LIMIT 100 /* Do not save signals with value > this */
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302
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303 /* The raw list of signals in the system -- might be incomplete, add any signal you need */
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304 struct sig_abb_raw {
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305 int sig;
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306 char *name;
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307 } abbrevs_raw[] = {
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308 { 0, "[unknown signal]" }
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309 #define RAW_SIGNAL( _sig ) ,{ _sig, #_sig }
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310 #ifdef SIGBUS
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311 RAW_SIGNAL( SIGBUS )
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312 #endif /* SIGBUS */
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313 #ifdef SIGTTIN
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314 RAW_SIGNAL( SIGTTIN )
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315 #endif /* SIGTTIN */
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316 #ifdef SIGTTOU
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317 RAW_SIGNAL( SIGTTOU )
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318 #endif /* SIGTTOU */
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319 #ifdef SIGPROF
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320 RAW_SIGNAL( SIGPROF )
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321 #endif /* SIGPROF */
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322 #ifdef SIGALRM
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323 RAW_SIGNAL( SIGALRM )
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324 #endif /* SIGALRM */
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325 #ifdef SIGFPE
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326 RAW_SIGNAL( SIGFPE )
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327 #endif /* SIGFPE */
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328 #ifdef SIGSTKFLT
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329 RAW_SIGNAL( SIGSTKFLT )
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330 #endif /* SIGSTKFLT */
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331 #ifdef SIGSTKSZ
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332 RAW_SIGNAL( SIGSTKSZ )
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333 #endif /* SIGSTKSZ */
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334 #ifdef SIGUSR1
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335 RAW_SIGNAL( SIGUSR1 )
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336 #endif /* SIGUSR1 */
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337 #ifdef SIGURG
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338 RAW_SIGNAL( SIGURG )
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339 #endif /* SIGURG */
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340 #ifdef SIGIO
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341 RAW_SIGNAL( SIGIO )
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342 #endif /* SIGIO */
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343 #ifdef SIGQUIT
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344 RAW_SIGNAL( SIGQUIT )
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345 #endif /* SIGQUIT */
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346 #ifdef SIGABRT
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347 RAW_SIGNAL( SIGABRT )
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348 #endif /* SIGABRT */
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349 #ifdef SIGTRAP
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350 RAW_SIGNAL( SIGTRAP )
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351 #endif /* SIGTRAP */
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352 #ifdef SIGVTALRM
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353 RAW_SIGNAL( SIGVTALRM )
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354 #endif /* SIGVTALRM */
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355 #ifdef SIGSEGV
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356 RAW_SIGNAL( SIGSEGV )
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357 #endif /* SIGSEGV */
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358 #ifdef SIGCONT
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359 RAW_SIGNAL( SIGCONT )
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360 #endif /* SIGCONT */
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361 #ifdef SIGPIPE
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362 RAW_SIGNAL( SIGPIPE )
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363 #endif /* SIGPIPE */
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364 #ifdef SIGWINCH
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365 RAW_SIGNAL( SIGWINCH )
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366 #endif /* SIGWINCH */
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367 #ifdef SIGXFSZ
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368 RAW_SIGNAL( SIGXFSZ )
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369 #endif /* SIGXFSZ */
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370 #ifdef SIGHUP
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371 RAW_SIGNAL( SIGHUP )
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372 #endif /* SIGHUP */
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373 #ifdef SIGCHLD
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374 RAW_SIGNAL( SIGCHLD )
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375 #endif /* SIGCHLD */
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376 #ifdef SIGSYS
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377 RAW_SIGNAL( SIGSYS )
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378 #endif /* SIGSYS */
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379 #ifdef SIGSTOP
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380 RAW_SIGNAL( SIGSTOP )
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381 #endif /* SIGSTOP */
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382 #ifdef SIGUSR2
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383 RAW_SIGNAL( SIGUSR2 )
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384 #endif /* SIGUSR2 */
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385 #ifdef SIGTSTP
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386 RAW_SIGNAL( SIGTSTP )
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387 #endif /* SIGTSTP */
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388 #ifdef SIGKILL
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389 RAW_SIGNAL( SIGKILL )
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390 #endif /* SIGKILL */
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391 #ifdef SIGXCPU
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392 RAW_SIGNAL( SIGXCPU )
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393 #endif /* SIGXCPU */
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394 #ifdef SIGUNUSED
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395 RAW_SIGNAL( SIGUNUSED )
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396 #endif /* SIGUNUSED */
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397 #ifdef SIGPWR
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398 RAW_SIGNAL( SIGPWR )
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399 #endif /* SIGPWR */
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400 #ifdef SIGILL
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401 RAW_SIGNAL( SIGILL )
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402 #endif /* SIGILL */
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403 #ifdef SIGINT
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404 RAW_SIGNAL( SIGINT )
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405 #endif /* SIGINT */
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406 #ifdef SIGIOT
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407 RAW_SIGNAL( SIGIOT )
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408 #endif /* SIGIOT */
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409 #ifdef SIGTERM
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410 RAW_SIGNAL( SIGTERM )
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411 #endif /* SIGTERM */
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412 };
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413
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414 TRACE_ENTRY("");
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415
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416 /* First pass: find the highest signal number */
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417 for (i=0; i < sizeof(abbrevs_raw)/sizeof(abbrevs_raw[0]); i++) {
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418 if (abbrevs_raw[i].sig > SIGNAL_MAX_LIMIT) {
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419 TRACE_DEBUG(ANNOYING, "Ignoring signal %s (%d), increase SIGNAL_MAX_LIMIT if you want it included", abbrevs_raw[i].name, abbrevs_raw[i].sig);
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420 continue;
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421 }
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422 if (abbrevs_raw[i].sig > abbrevs_nr)
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423 abbrevs_nr = abbrevs_raw[i].sig;
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424 }
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425
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426 /* Now, alloc the array */
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427 abbrevs_nr++; /* 0-based */
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428 CHECK_MALLOC( abbrevs = calloc( abbrevs_nr, sizeof(char *) ) );
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429
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430 /* Second pass: add all the signals in the array */
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431 for (i=0; i < sizeof(abbrevs_raw)/sizeof(abbrevs_raw[0]); i++) {
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432 if (abbrevs_raw[i].sig > SIGNAL_MAX_LIMIT)
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433 continue;
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434
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435 if (abbrevs[abbrevs_raw[i].sig] == NULL)
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436 abbrevs[abbrevs_raw[i].sig] = abbrevs_raw[i].name;
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437 }
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438
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439 /* Third pass: Set all missing signals to the undef value */
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440 for (i=0; i < abbrevs_nr; i++) {
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441 if (abbrevs[i] == NULL)
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442 abbrevs[i] = abbrevs_raw[0].name;
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443 }
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444
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445 /* Done! */
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446 return 0;
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447 }
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448
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449 /* Names of signals */
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450 const char * fd_sig_abbrev(int signal)
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451 {
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452 if (signal < abbrevs_nr)
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453 return abbrevs[signal];
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454 return abbrevs[0];
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455 }
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456
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