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/* vi: set sw=4 ts=4: */
/*
* pidof implementation for busybox
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
//config:config PIDOF
//config: bool "pidof (6.3 kb)"
//config: default y
//config: help
//config: Pidof finds the process id's (pids) of the named programs. It prints
//config: those id's on the standard output.
//config:
//config:config FEATURE_PIDOF_SINGLE
//config: bool "Enable single shot (-s)"
//config: default y
//config: depends on PIDOF
//config: help
//config: Support '-s' for returning only the first pid found.
//config:
//config:config FEATURE_PIDOF_OMIT
//config: bool "Enable omitting pids (-o PID)"
//config: default y
//config: depends on PIDOF
//config: help
//config: Support '-o PID' for omitting the given pid(s) in output.
//config: The special pid %PPID can be used to name the parent process
//config: of the pidof, in other words the calling shell or shell script.
//applet:IF_PIDOF(APPLET(pidof, BB_DIR_BIN, BB_SUID_DROP))
/* can't be noexec: can find _itself_ under wrong name, since after fork only,
* /proc/PID/cmdline and comm are wrong! Can fix comm (prctl(PR_SET_NAME)),
* but cmdline?
*/
//kbuild:lib-$(CONFIG_PIDOF) += pidof.o
//usage:#if (ENABLE_FEATURE_PIDOF_SINGLE || ENABLE_FEATURE_PIDOF_OMIT)
//usage:#define pidof_trivial_usage
//usage: IF_FEATURE_PIDOF_SINGLE("[-s] ")IF_FEATURE_PIDOF_OMIT("[-o PID] ")"[NAME]..."
//usage:#define USAGE_PIDOF "\n"
//usage:#else
//usage:#define pidof_trivial_usage
//usage: "[NAME]..."
//usage:#define USAGE_PIDOF /* none */
//usage:#endif
//usage:#define pidof_full_usage "\n\n"
//usage: "List PIDs of all processes with names that match NAMEs"
//usage: USAGE_PIDOF
//usage: IF_FEATURE_PIDOF_SINGLE(
//usage: "\n -s Show only one PID"
//usage: )
//usage: IF_FEATURE_PIDOF_OMIT(
//usage: "\n -o PID Omit given pid"
//usage: "\n Use %PPID to omit pid of pidof's parent"
//usage: )
//usage:
//usage:#define pidof_example_usage
//usage: "$ pidof init\n"
//usage: "1\n"
//usage: IF_FEATURE_PIDOF_OMIT(
//usage: "$ pidof /bin/sh\n20351 5973 5950\n")
//usage: IF_FEATURE_PIDOF_OMIT(
//usage: "$ pidof /bin/sh -o %PPID\n20351 5950")
#include "libbb.h"
enum {
IF_FEATURE_PIDOF_SINGLE(OPTBIT_SINGLE,)
IF_FEATURE_PIDOF_OMIT( OPTBIT_OMIT ,)
OPT_SINGLE = IF_FEATURE_PIDOF_SINGLE((1<<OPTBIT_SINGLE)) + 0,
OPT_OMIT = IF_FEATURE_PIDOF_OMIT( (1<<OPTBIT_OMIT )) + 0,
};
int pidof_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int pidof_main(int argc UNUSED_PARAM, char **argv)
{
unsigned first = 1;
unsigned opt;
#if ENABLE_FEATURE_PIDOF_OMIT
llist_t *omits = NULL; /* list of pids to omit */
#endif
/* do unconditional option parsing */
opt = getopt32(argv, ""
IF_FEATURE_PIDOF_SINGLE ("s")
IF_FEATURE_PIDOF_OMIT("o:*", &omits));
#if ENABLE_FEATURE_PIDOF_OMIT
/* fill omit list. */
{
llist_t *omits_p = omits;
while (1) {
omits_p = llist_find_str(omits_p, "%PPID");
if (!omits_p)
break;
/* are we asked to exclude the parent's process ID? */
omits_p->data = utoa((unsigned)getppid());
}
}
#endif
/* Looks like everything is set to go. */
argv += optind;
while (*argv) {
pid_t *pidList;
pid_t *pl;
/* reverse the pidlist like GNU pidof does. */
pidList = pidlist_reverse(find_pid_by_name(*argv));
for (pl = pidList; *pl; pl++) {
#if ENABLE_FEATURE_PIDOF_OMIT
if (opt & OPT_OMIT) {
llist_t *omits_p = omits;
while (omits_p) {
if (xatoul(omits_p->data) == (unsigned long)(*pl)) {
goto omitting;
}
omits_p = omits_p->link;
}
}
#endif
printf(" %u" + first, (unsigned)*pl);
first = 0;
if (ENABLE_FEATURE_PIDOF_SINGLE && (opt & OPT_SINGLE))
break;
#if ENABLE_FEATURE_PIDOF_OMIT
omitting: ;
#endif
}
free(pidList);
argv++;
}
if (!first)
bb_putchar('\n');
#if ENABLE_FEATURE_PIDOF_OMIT
if (ENABLE_FEATURE_CLEAN_UP)
llist_free(omits, NULL);
#endif
return first; /* 1 (failure) - no processes found */
}
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