toys/posix/kill.c

/* kill.c - a program to send signals to processes
 *
 * Copyright 2012 Daniel Walter <d.walter@0x90.at>
 *
 * See http://opengroup.org/onlinepubs/9699919799/utilities/kill.html

USE_KILL(NEWTOY(kill, "?s: l", TOYFLAG_BIN))

config KILL
  bool "kill"
  default y
  help
    usage: kill [-l [SIGNAL] | -s SIGNAL | -SIGNAL] pid...

    Send a signal to a process
*/

#define FOR_kill
#include "toys.h"

GLOBALS(
  char *signame;
)

void kill_main(void)
{
  int signum;
  char *tmp, **args = toys.optargs;
  pid_t pid;

  // list signal(s)
  if (toys.optflags & FLAG_l) {
    if (*args) {
      int signum = sig_to_num(*args);
      char *s = NULL;

      if (signum>=0) s = num_to_sig(signum&127);
      puts(s ? s : "UNKNOWN");
    } else sig_to_num(NULL);
    return;
  }

  // signal must come before pids, so "kill -9 -1" isn't confusing.

  if (!TT.signame && *args && **args=='-') TT.signame=*(args++)+1;
  if (TT.signame) {
    char *arg;
    int i = strtol(TT.signame, &arg, 10);
    if (!*arg) arg = num_to_sig(i);
    else arg = TT.signame;

    if (!arg || -1 == (signum = sig_to_num(arg)))
      error_exit("Unknown signal '%s'", arg);
  } else signum = SIGTERM;

  if (!*args) {
    toys.exithelp++;
    error_exit("missing argument");
  }

  while (*args) {
    char *arg = *(args++);

    pid = strtol(arg, &tmp, 10);
    if (*tmp || kill(pid, signum) < 0) error_msg("unknown pid '%s'", arg);
  }
}