toys/lsb/pidof.c

/* pidof.c - Print the Process IDs of all processes with the given names.
 *
 * Copyright 2012 Andreas Heck <aheck@gmx.de>
 * Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com>
 *
 * http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/pidof.html

USE_PIDOF(NEWTOY(pidof, "so:<1", TOYFLAG_USR|TOYFLAG_BIN))

config PIDOF
  bool "pidof"
  default y
  help
    usage: pidof [-s] [-o omitpid[,omitpid..]] [NAME]...

    Print the PIDs of all processes with the given names.
    -s	single shot, only return one pid.
    -o	omits processes with specified PID
*/

#define FOR_pidof
#include "toys.h"

GLOBALS(
  char *omit;
)

static int print_pid(pid_t pid)
{

  if (toys.optflags & FLAG_o)
  {
      char * res;
      int len;
      snprintf(toybuf, sizeof(toybuf), "%d", pid);
      len = strlen(toybuf);
      res = strstr(TT.omit, toybuf);
      if (res &&
          (res == TT.omit || res[-1] == ',') &&
          (res[len] == ',' || res[len] == 0))
          // Found in omit string
          return 1;
  }

  xprintf("%s%ld", toys.exitval ? "" : " ", (long)pid);
  toys.exitval = 0;

  if (toys.optflags & FLAG_s)
      return 0;

  return 1;
}

void pidof_main(void)
{
  toys.exitval = 1;
  for_each_pid_with_name_in(toys.optargs, print_pid);
  if (!toys.exitval) xputc('\n');
}