commands/simple/kill.c

   1 /* kill - send a signal to a process    Author: Adri Koppes  */
   2
   3 #include <sys/types.h>
   4 #include <errno.h>
   5 #include <signal.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8 #include <stdio.h>
   9
  10 _PROTOTYPE(int main, (int argc, char **argv));
  11 _PROTOTYPE(void usage, (void));
  12
  13 /* Table of signal names. */
  14 struct signames {
  15         char *name;
  16         int sig;
  17 } signames[] = {
  18         { "HUP",        SIGHUP          },
  19         { "INT",        SIGINT          },
  20         { "QUIT",       SIGQUIT         },
  21         { "ILL",        SIGILL          },
  22         { "TRAP",       SIGTRAP         },
  23         { "ABRT",       SIGABRT         },
  24         { "IOT",        SIGIOT          },
  25         { "FPE",        SIGFPE          },
  26         { "KILL",       SIGKILL         },
  27         { "USR1",       SIGUSR1         },
  28         { "SEGV",       SIGSEGV         },
  29         { "USR2",       SIGUSR2         },
  30         { "PIPE",       SIGPIPE         },
  31         { "ALRM",       SIGALRM         },
  32         { "TERM",       SIGTERM         },
  33         { "EMT",        SIGEMT          },
  34         { "BUS",        SIGBUS          },
  35         { "CHLD",       SIGCHLD         },
  36         { "CONT",       SIGCONT         },
  37         { "STOP",       SIGSTOP         },
  38         { "TSTP",       SIGTSTP         },
  39         { "TTIN",       SIGTTIN         },
  40         { "TTOU",       SIGTTOU         },
  41 #ifdef SIGWINCH
  42         { "WINCH",      SIGWINCH        },
  43 #endif
  44         { "VTALRM",     SIGVTALRM       },
  45         { "PROF",       SIGPROF         },
  46         { NULL,         0               }
  47 };
  48
  49 int main(argc, argv)
  50 int argc;
  51 char **argv;
  52 {
  53   pid_t proc;
  54   int ex = 0, sig = SIGTERM;
  55   char *end;
  56   long l;
  57   unsigned long ul;
  58   struct sigaction sa;
  59   int i, doit;
  60   struct signames *snp;
  61
  62   if (argc > 1 && argv[1][0] == '-') {
  63         sig = -1;
  64         for (snp = signames; snp->name != NULL; snp++) {        /* symbolic? */
  65                 if (strcmp(snp->name, argv[1] + 1) == 0) {
  66                         sig = snp->sig;
  67                         break;
  68                 }
  69         }
  70         if (sig < 0) {                                          /* numeric? */
  71                 ul = strtoul(argv[1] + 1, &end, 10);
  72                 if (end == argv[1] + 1 || *end != 0 || ul >= _NSIG) usage();
  73                 sig = ul;
  74         }
  75         argv++;
  76         argc--;
  77   }
  78   sa.sa_flags = 0;
  79   sigemptyset(&sa.sa_mask);
  80   sa.sa_handler = SIG_IGN;              /* try not to kill yourself */
  81   (void) sigaction(sig, &sa, (struct sigaction *) NULL);
  82
  83   for (doit = 0; doit <= 1; doit++) {
  84         for (i = 1; i < argc; i++) {
  85                 l = strtoul(argv[i], &end, 10);
  86                 if (end == argv[i] || *end != 0 || (pid_t) l != l) usage();
  87                 proc = l;
  88                 if (doit && kill(proc, sig) < 0) {
  89                         fprintf(stderr, "kill: %d: %s\n",
  90                                 proc, strerror(errno));
  91                         ex = 1;
  92                 }
  93         }
  94   }
  95   return(ex);
  96 }
  97
  98 void usage()
  99 {
 100   fprintf(stderr, "Usage: kill [-sig] pid\n");
 101   exit(1);
 102 }