CWRU/misc/sigstat.c

   1 /*
   2  * sigstat - print out useful information about signal arguments
   3  *
   4  * Chet Ramey
   5  * chet@po.cwru.edu
   6  */
   7
   8 /* Copyright (C) 1991-2009 Free Software Foundation, Inc.
   9
  10    This file is part of GNU Bush, the Bourne Again SHell.
  11
  12    Bush is free software: you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation, either version 3 of the License, or
  15    (at your option) any later version.
  16
  17    Bush is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with Bush.  If not, see <http://www.gnu.org/licenses/>.
  24 */
  25
  26 #include <sys/types.h>
  27 #include <signal.h>
  28 #include <stdio.h>
  29
  30 extern char     *strrchr();
  31 static char     *signames[NSIG];
  32
  33 char    *progname;
  34
  35 void    sigstat();
  36
  37 main(argc, argv)
  38 int     argc;
  39 char    **argv;
  40 {
  41         register int    i;
  42         char    *t;
  43
  44         if (t = strrchr(argv[0], '/'))
  45                 progname = ++t;
  46         else
  47                 progname = argv[0];
  48         init_signames();
  49         if (argc == 1) {
  50                 for (i = 1; i < NSIG; i++)
  51                         sigstat(i);
  52                 exit(0);
  53         }
  54         for (i = 1; i < argc; i++)
  55                 sigstat(atoi(argv[i]));
  56         exit(0);
  57 }
  58
  59 void
  60 sigstat(sig)
  61 int     sig;
  62 {
  63         struct sigaction oact;
  64         char *signame;
  65         sigset_t set, oset;
  66         int blocked;
  67
  68         if (sig < 0 || sig >= NSIG) {
  69                 fprintf(stderr, "%s: %d: signal out of range\n", progname, sig);
  70                 return;
  71         }
  72         signame = signames[sig];
  73         sigemptyset(&oset);
  74         sigprocmask(SIG_BLOCK, (sigset_t *)NULL, &oset);
  75         if (sigismember(&oset, sig))
  76                 printf("%s: signal is blocked\n", signame);
  77         sigaction(sig, (struct sigaction *)NULL, &oact);
  78         if (oact.sa_handler == SIG_IGN)
  79                 printf("%s: signal is ignored\n", signame);
  80         else if (oact.sa_handler == SIG_DFL)
  81                 printf("%s: signal is defaulted\n", signame);
  82         else
  83                 printf("%s: signal is trapped (?)\n", signame);
  84 }
  85
  86 init_signames()
  87 {
  88         register int i;
  89         bzero(signames, sizeof(signames));
  90
  91 #if defined (SIGHUP)            /* hangup */
  92         signames[SIGHUP] = "SIGHUP";
  93 #endif
  94 #if defined (SIGINT)            /* interrupt */
  95         signames[SIGINT] = "SIGINT";
  96 #endif
  97 #if defined (SIGQUIT)           /* quit */
  98         signames[SIGQUIT] = "SIGQUIT";
  99 #endif
 100 #if defined (SIGILL)            /* illegal instruction (not reset when caught) */
 101         signames[SIGILL] = "SIGILL";
 102 #endif
 103 #if defined (SIGTRAP)           /* trace trap (not reset when caught) */
 104         signames[SIGTRAP] = "SIGTRAP";
 105 #endif
 106 #if defined (SIGABRT)           /*  */
 107         signames[SIGABRT] = "SIGABRT";
 108 #endif
 109 #if defined (SIGIOT)            /* IOT instruction */
 110         signames[SIGIOT] = "SIGIOT";
 111 #endif
 112 #if defined (SIGEMT)            /* EMT instruction */
 113         signames[SIGEMT] = "SIGEMT";
 114 #endif
 115 #if defined (SIGFPE)            /* floating point exception */
 116         signames[SIGFPE] = "SIGFPE";
 117 #endif
 118 #if defined (SIGKILL)           /* kill (cannot be caught or ignored) */
 119         signames[SIGKILL] = "SIGKILL";
 120 #endif
 121 #if defined (SIGBUS)            /* bus error */
 122         signames[SIGBUS] = "SIGBUS";
 123 #endif
 124 #if defined (SIGSEGV)           /* segmentation violation */
 125         signames[SIGSEGV] = "SIGSEGV";
 126 #endif
 127 #if defined (SIGSYS)            /* bad argument to system call */
 128         signames[SIGSYS] = "SIGSYS";
 129 #endif
 130 #if defined (SIGPIPE)           /* write on a pipe with no one to read it */
 131         signames[SIGPIPE] = "SIGPIPE";
 132 #endif
 133 #if defined (SIGALRM)           /* alarm clock */
 134         signames[SIGALRM] = "SIGALRM";
 135 #endif
 136 #if defined (SIGTERM)           /* software termination signal from kill */
 137         signames[SIGTERM] = "SIGTERM";
 138 #endif
 139 #if defined (SIGCLD)            /* Like SIGCHLD.  */
 140         signames[SIGCLD] = "SIGCLD";
 141 #endif
 142 #if defined (SIGPWR)            /* Magic thing for some machines. */
 143         signames[SIGPWR] = "SIGPWR";
 144 #endif
 145 #if defined (SIGPOLL)           /* For keyboard input?  */
 146         signames[SIGPOLL] = "SIGPOLL";
 147 #endif
 148 #if defined (SIGURG)            /* urgent condition on IO channel */
 149         signames[SIGURG] = "SIGURG";
 150 #endif
 151 #if defined (SIGSTOP)           /* sendable stop signal not from tty */
 152         signames[SIGSTOP] = "SIGSTOP";
 153 #endif
 154 #if defined (SIGTSTP)           /* stop signal from tty */
 155         signames[SIGTSTP] = "SIGTSTP";
 156 #endif
 157 #if defined (SIGCONT)           /* continue a stopped process */
 158         signames[SIGCONT] = "SIGCONT";
 159 #endif
 160 #if defined (SIGCHLD)           /* to parent on child stop or exit */
 161         signames[SIGCHLD] = "SIGCHLD";
 162 #endif
 163 #if defined (SIGTTIN)           /* to readers pgrp upon background tty read */
 164         signames[SIGTTIN] = "SIGTTIN";
 165 #endif
 166 #if defined (SIGTTOU)           /* like TTIN for output if (tp->t_local&LTOSTOP) */
 167         signames[SIGTTOU] = "SIGTTOU";
 168 #endif
 169 #if defined (SIGIO)             /* input/output possible signal */
 170         signames[SIGIO] = "SIGIO";
 171 #endif
 172 #if defined (SIGXCPU)           /* exceeded CPU time limit */
 173         signames[SIGXCPU] = "SIGXCPU";
 174 #endif
 175 #if defined (SIGXFSZ)           /* exceeded file size limit */
 176         signames[SIGXFSZ] = "SIGXFSZ";
 177 #endif
 178 #if defined (SIGVTALRM)         /* virtual time alarm */
 179         signames[SIGVTALRM] = "SIGVTALRM";
 180 #endif
 181 #if defined (SIGPROF)           /* profiling time alarm */
 182         signames[SIGPROF] = "SIGPROF";
 183 #endif
 184 #if defined (SIGWINCH)          /* window changed */
 185         signames[SIGWINCH] = "SIGWINCH";
 186 #endif
 187 #if defined (SIGLOST)           /* resource lost (eg, record-lock lost) */
 188         signames[SIGLOST] = "SIGLOST";
 189 #endif
 190 #if defined (SIGUSR1)           /* user defined signal 1 */
 191         signames[SIGUSR1] = "SIGUSR1";
 192 #endif
 193 #if defined (SIGUSR2)           /* user defined signal 2 */
 194         signames[SIGUSR2] = "SIGUSR2";
 195 #endif
 196 #if defined (SIGMSG)    /* HFT input data pending */
 197         signames[SIGMSG] = "SIGMSG";
 198 #endif
 199 #if defined (SIGPWR)    /* power failure imminent (save your data) */
 200         signames[SIGPWR] = "SIGPWR";
 201 #endif
 202 #if defined (SIGDANGER) /* system crash imminent */
 203         signames[SIGDANGER] = "SIGDANGER";
 204 #endif
 205 #if defined (SIGMIGRATE)        /* migrate process to another CPU */
 206         signames[SIGMIGRATE] = "SIGMIGRATE";
 207 #endif
 208 #if defined (SIGPRE)    /* programming error */
 209         signames[SIGPRE] = "SIGPRE";
 210 #endif
 211 #if defined (SIGGRANT)  /* HFT monitor mode granted */
 212         signames[SIGGRANT] = "SIGGRANT";
 213 #endif
 214 #if defined (SIGRETRACT)        /* HFT monitor mode retracted */
 215         signames[SIGRETRACT] = "SIGRETRACT";
 216 #endif
 217 #if defined (SIGSOUND)  /* HFT sound sequence has completed */
 218         signames[SIGSOUND] = "SIGSOUND";
 219 #endif
 220
 221         for (i = 0; i < NSIG; i++)
 222                 if (signames[i] == (char *)NULL) {
 223                         signames[i] = (char *)malloc (16);;
 224                         sprintf (signames[i], "signal %d", i);
 225                 }
 226 }