source: MondoRescue/branches/3.2/mindi-busybox/procps/pidof.c@ 3232

/* 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.
 */

//usage:#if (ENABLE_FEATURE_PIDOF_SINGLE || ENABLE_FEATURE_PIDOF_OMIT)
//usage:#define pidof_trivial_usage
//usage:       "[OPTIONS] [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 */
    opt_complementary = "o::";
#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 */
}