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/*
* Mini pidofproc implementation for busybox.
*
* Copyright (C) 2005 by David Seikel won_fang@yahoo.com.au
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307 USA
*
*/
#include <getopt.h>
#include <string.h>
#include <unistd.h>
#include "busybox.h"
#include "lib_init_d.h"
int checkpid(char *pid)
{
int found = 0;
char proc[132];
sprintf(proc, "/proc/%s", pid);
if (stat(proc, &path_stat) == 0)
{
char *state = NULL;
sprintf(proc, "/proc/%s/stat", pid);
state = quick_read(proc);
if (state != NULL)
{
/* Read and interpret the third space seperated field (State - DRSW = OK - ZX = DEAD_PID - T = STOPPED) */
if (state[0] != '\0')
{
while (*state != ' ') state++;
while (*state == ' ') state++;
while (*state != ' ') state++
// Should compare the name while scanning this.
;
while (*state == ' ') state++;
switch (*state)
{
case 'D' :
case 'R' :
case 'S' :
case 'W' :
case 'T' : /* Until proven otherwise, I'm assuming this means OK. */
found = 1;
}
}
}
else /* Paranoid fallbacks. */
{
sprintf(proc, "/proc/%s/exe", pid);
if (stat(proc, &path_stat) == 0)
{
// Should check that it is a link to our executable.
found = 1;
}
else
{
sprintf(proc, "/proc/%s/cmdline", pid);
if (stat(proc, &path_stat) == 0)
{
// Should compare the name.
found = 1;
}
}
}
}
return found;
}
int pidofproc(char *pidfile, char *pathname, char **pids)
{
int status = INIT_D_STATUS_UNKNOWN;
char *our_pidfile = pidfile;
char *our_pids = NULL;
if (our_pidfile == NULL)
bb_xasprintf(&our_pidfile, "/var/run/%s.pid", bb_get_last_path_component(pathname));
our_pids = quick_read(our_pidfile);
if (our_pids != NULL)
{
int i;
char *pid;
char *strtok_temp;
status = INIT_D_STATUS_DEAD_PID;
if (pids != NULL)
{
(*pids) = (char *) xmalloc(sizeof (char) * strlen(our_pids) + 1);
(*pids)[0] = '\0';
}
pid = strtok_r(our_pids, " \n\r", &strtok_temp);
for (i = 0; pid != NULL; i++)
{
if (checkpid(pid))
{
if (pids != NULL)
{
strcat(*pids, pid);
strcat(*pids, " ");
}
status = INIT_D_STATUS_OK;
}
pid = strtok_r(NULL, " \n\r", &strtok_temp);
}
free(our_pids);
}
else
status = INIT_D_STATUS_NOT_RUNNING;
if (pidfile == NULL)
free(our_pidfile);
return status;
}
/*
pidofproc [-p pidfile] pathname
This function returns one or more pid(s) for a particular
daemon using the algorithm given above. Only pids of running processes
should be returned.
Multiple pid(s) shall be separated by a single space in the pidfile
and in the output of pidofproc.
Compliant applications may use the basename instead of the pathname.
pidofproc should return the LSB defined exit status
codes for "status". It shall return 0 if the program is
running and not 0 otherwise.
*/
static const struct option long_options[] =
{
{ "pidfile", 1, NULL, 'p' },
{ 0, 0, 0, 0 }
};
int pidofproc_main(int argc, char **argv)
{
int result = EXIT_FAILURE;
char *pidfile = NULL;
char *pids = NULL;
int opt;
while ((opt = getopt_long (argc, argv, "p:", long_options, NULL)) > 0)
{
switch (opt)
{
case 'p':
pidfile = optarg;
break;
default:
bb_show_usage();
}
}
/* We require exactly one argument: the path name */
if (optind != (argc - 1))
bb_show_usage();
result = pidofproc(pidfile, argv[optind], &pids);
if (pids != NULL)
bb_printf("%s\n", pids);
return result;
}
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