source: trunk/minix/commands/simple/kill.c@ 20

/* kill - send a signal to a process    Author: Adri Koppes  */

#include <sys/types.h>
#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>

_PROTOTYPE(int main, (int argc, char **argv));
_PROTOTYPE(void usage, (void));

/* Table of signal names. */
struct signames {
        char *name;
        int sig;
} signames[] = {
        { "HUP",        SIGHUP          },
        { "INT",        SIGINT          },
        { "QUIT",       SIGQUIT         },
        { "ILL",        SIGILL          },
        { "TRAP",       SIGTRAP         },
        { "ABRT",       SIGABRT         },
        { "IOT",        SIGIOT          },
        { "FPE",        SIGFPE          },
        { "KILL",       SIGKILL         },
        { "USR1",       SIGUSR1         },
        { "SEGV",       SIGSEGV         },
        { "USR2",       SIGUSR2         },
        { "PIPE",       SIGPIPE         },
        { "ALRM",       SIGALRM         },
        { "TERM",       SIGTERM         },
        { "EMT",        SIGEMT          },
        { "BUS",        SIGBUS          },
        { "CHLD",       SIGCHLD         },
        { "CONT",       SIGCONT         },
        { "STOP",       SIGSTOP         },
        { "TSTP",       SIGTSTP         },
        { "TTIN",       SIGTTIN         },
        { "TTOU",       SIGTTOU         },
#ifdef SIGWINCH
        { "WINCH",      SIGWINCH        },
#endif
        { NULL,         0               }
};

int main(argc, argv)
int argc;
char **argv;
{
  pid_t proc;
  int ex = 0, sig = SIGTERM;
  char *end;
  long l;
  unsigned long ul;
  struct sigaction sa;
  int i, doit;
  struct signames *snp;

  if (argc > 1 && argv[1][0] == '-') {
        sig = -1;
        for (snp = signames; snp->name != NULL; snp++) {        /* symbolic? */
                if (strcmp(snp->name, argv[1] + 1) == 0) {
                        sig = snp->sig;
                        break;
                }
        }
        if (sig < 0) {                                          /* numeric? */
                ul = strtoul(argv[1] + 1, &end, 10);
                if (end == argv[1] + 1 || *end != 0 || ul > _NSIG) usage();
                sig = ul;
        }
        argv++;
        argc--;
  }
  sa.sa_flags = 0;
  sigemptyset(&sa.sa_mask);
  sa.sa_handler = SIG_IGN;              /* try not to kill yourself */
  (void) sigaction(sig, &sa, (struct sigaction *) NULL);

  for (doit = 0; doit <= 1; doit++) {
        for (i = 1; i < argc; i++) {
                l = strtoul(argv[i], &end, 10);
                if (end == argv[i] || *end != 0 || (pid_t) l != l) usage();
                proc = l;
                if (doit && kill(proc, sig) < 0) {
                        fprintf(stderr, "kill: %d: %s\n",
                                proc, strerror(errno));
                        ex = 1;
                }
        }
  }
  return(ex);
}

void usage()
{
  fprintf(stderr, "Usage: kill [-sig] pid\n");
  exit(1);
}