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annotate toys/kill.c @ 552:7b85b0a0e9c0

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Have probe for unshare test for actual unshare() function in libc.
author Rob Landley <rob@landley.net>
date Mon, 19 Mar 2012 20:15:08 -0500
parents bc4615e2e339
children
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96a5e66a7dae Add new kill toy. Used to send signals to a process or a process group.
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1 /* vi: set sw=4 ts=4:
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2 *
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3 * kill.c - a program to send signals to processes
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4 *
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5 * Copyright 2012 Daniel Walter <d.walter@0x90.at>
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6 *
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7 * See http://opengroup.org/onlinepubs/9699919799/utilities/kill.html
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8
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9 USE_KILL(NEWTOY(kill, "?s: l", TOYFLAG_BIN))
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10
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11 config KILL
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12 bool "kill"
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13 default y
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14 help
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15 usage: kill [-l [SIGNAL] | -s SIGNAL | -SIGNAL] pid...
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16
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17 Send a signal to a process
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18
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19 */
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20
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21 #include "toys.h"
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22
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23 DEFINE_GLOBALS(
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24 char *signame;
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25 )
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26
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27 #define TT this.kill
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28
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29 void kill_main(void)
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30 {
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31 int signum;
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32 char *tmp, **args = toys.optargs;
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33 pid_t pid;
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34
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35 // list signal(s)
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36 if (toys.optflags & 1) {
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37 if (*args) {
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38 int signum = sig_to_num(*args);
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39 char *s = NULL;
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40
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41 if (signum>=0) s = num_to_sig(signum&127);
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42 puts(s ? s : "UNKNOWN");
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43 } else sig_to_num(NULL);
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44 return;
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45 }
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46
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47 // signal must come before pids, so "kill -9 -1" isn't confusing.
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48
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49 if (!TT.signame && *args && **args=='-') TT.signame=*(args++)+1;
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50 if (TT.signame) {
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51 char *arg;
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52 int i = strtol(TT.signame, &arg, 10);
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53 if (!*arg) arg = num_to_sig(i);
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54 else arg = TT.signame;
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55
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56 if (!arg || -1 == (signum = sig_to_num(arg)))
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57 error_exit("Unknown signal '%s'", arg);
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58 } else signum = SIGTERM;
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59
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60 if (!*args) {
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61 toys.exithelp++;
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62 error_exit("missing argument");
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63 }
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64
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65 while (*args) {
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66 char *arg = *(args++);
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67
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68 pid = strtol(arg, &tmp, 10);
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69 if (*tmp || kill(pid, signum) < 0) {
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70 error_msg("unknown pid '%s'", arg);
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71 toys.exitval = EXIT_FAILURE;
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72 }
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73 }
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74 }