trunk/sbin/start-stop-daemon.c

/*
 * A rewrite of the original Debian's start-stop-daemon Perl script
 * in C (faster - it is executed many times during system startup).
 *
 * Written by Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>,
 * public domain.  Based conceptually on start-stop-daemon.pl, by Ian
 * Jackson <ijackson@gnu.ai.mit.edu>.  May be used and distributed
 * freely for any purpose.  Changes by Christian Schwarz
 * <schwarz@monet.m.isar.de>, to make output conform to the Debian
 * Console Message Standard, also placed in public domain.  Minor
 * changes by Klee Dienes <klee@debian.org>, also placed in the Public
 * Domain.
 *
 * Changes by Ben Collins <bcollins@debian.org>, added --chuid, --background
 * and --make-pidfile options, placed in public domain aswell.
 *
 * Port to OpenBSD by Sontri Tomo Huynh <huynh.29@osu.edu>
 *                 and Andreas Schuldei <andreas@schuldei.org>
 *
 * Changes by Ian Jackson: added --retry (and associated rearrangements).
 *
 * Modified for Gentoo rc-scripts by Donny Davies <woodchip@gentoo.org>:
 *   I removed the BSD/Hurd/OtherOS stuff, added #include <stddef.h>
 *   and stuck in a #define VERSION "1.9.18".  Now it compiles without
 *   the whole automake/config.h dance.
 */

#include <stddef.h>
#define VERSION "1.9.18"

#define MIN_POLL_INTERVAL 20000 /*us*/

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <signal.h>
#include <sys/stat.h>
#include <dirent.h>
#include <sys/time.h>
#include <unistd.h>
#include <getopt.h>
#include <pwd.h>
#include <grp.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/termios.h>
#include <fcntl.h>
#include <limits.h>
#include <assert.h>
#include <ctype.h>
#include <error.h>

static int testmode = 0;
static int quietmode = 0;
static int exitnodo = 1;
static int start = 0;
static int stop = 0;
static int background = 0;
static int mpidfile = 0;
static int signal_nr = 15;
static const char *signal_str = NULL;
static int user_id = -1;
static int runas_uid = -1;
static int runas_gid = -1;
static const char *userspec = NULL;
static char *changeuser = NULL;
static const char *changegroup = NULL;
static char *changeroot = NULL;
static const char *cmdname = NULL;
static char *execname = NULL;
static char *startas = NULL;
static const char *pidfile = NULL;
static char what_stop[1024];
static const char *schedule_str = NULL;
static const char *progname = "";
static int nicelevel = 0;

static struct stat exec_stat;

struct pid_list {
        struct pid_list *next;
        pid_t pid;
};

static struct pid_list *found = NULL;
static struct pid_list *killed = NULL;

struct schedule_item {
        enum { sched_timeout, sched_signal, sched_goto, sched_forever } type;
        int value; /* seconds, signal no., or index into array */
        /* sched_forever is only seen within parse_schedule and callees */
};

static int schedule_length;
static struct schedule_item *schedule = NULL;

static void *xmalloc(int size);
static void push(struct pid_list **list, pid_t pid);
static void do_help(void);
static void parse_options(int argc, char * const *argv);
static int pid_is_user(pid_t pid, uid_t uid);
static int pid_is_cmd(pid_t pid, const char *name);
static void check(pid_t pid);
static void do_pidfile(const char *name);
static void do_stop(int signal_nr, int quietmode,
                    int *n_killed, int *n_notkilled, int retry_nr);
static int pid_is_exec(pid_t pid, const struct stat *esb);

#ifdef __GNUC__
static void fatal(const char *format, ...)
        __attribute__((noreturn, format(printf, 1, 2)));
static void badusage(const char *msg)
        __attribute__((noreturn));
#else
static void fatal(const char *format, ...);
static void badusage(const char *msg);
#endif

/* This next part serves only to construct the TVCALC macro, which
 * is used for doing arithmetic on struct timeval's.  It works like this:
 *   TVCALC(result, expression);
 * where result is a struct timeval (and must be an lvalue) and
 * expression is the single expression for both components.  In this
 * expression you can use the special values TVELEM, which when fed a
 * const struct timeval* gives you the relevant component, and
 * TVADJUST.  TVADJUST is necessary when subtracting timevals, to make
 * it easier to renormalise.  Whenver you subtract timeval elements,
 * you must make sure that TVADJUST is added to the result of the
 * subtraction (before any resulting multiplication or what have you).
 * TVELEM must be linear in TVADJUST.
 */
typedef long tvselector(const struct timeval*);
static long tvselector_sec(const struct timeval *tv) { return tv->tv_sec; }
static long tvselector_usec(const struct timeval *tv) { return tv->tv_usec; }
#define TVCALC_ELEM(result, expr, sec, adj)                           \
{                                                                     \
  const long TVADJUST = adj;                                          \
  long (*const TVELEM)(const struct timeval*) = tvselector_##sec;     \
  (result).tv_##sec = (expr);                                         \
}
#define TVCALC(result,expr)                                           \
do {                                                                  \
  TVCALC_ELEM(result, expr, sec, (-1));                               \
  TVCALC_ELEM(result, expr, usec, (+1000000));                        \
  (result).tv_sec += (result).tv_usec / 1000000;                      \
  (result).tv_usec %= 1000000;                                        \
} while(0)


static void
fatal(const char *format, ...)
{
        va_list arglist;

        fprintf(stderr, "%s: ", progname);
        va_start(arglist, format);
        vfprintf(stderr, format, arglist);
        va_end(arglist);
        putc('\n', stderr);
        exit(2);
}


static void *
xmalloc(int size)
{
        void *ptr;

        ptr = malloc(size);
        if (ptr)
                return ptr;
        fatal("malloc(%d) failed", size);
}


static void
xgettimeofday(struct timeval *tv)
{
        if (gettimeofday(tv,0) != 0)
                fatal("gettimeofday failed: %s", strerror(errno));
}


static void
push(struct pid_list **list, pid_t pid)
{
        struct pid_list *p;

        p = xmalloc(sizeof(*p));
        p->next = *list;
        p->pid = pid;
        *list = p;
}

static void
clear(struct pid_list **list)
{
        struct pid_list *here, *next;

        for (here = *list; here != NULL; here = next) {
                next = here->next;
                free(here);
        }

        *list = NULL;
}

static void
do_help(void)
{
        printf(
"start-stop-daemon " VERSION " for Debian - small and fast C version written by\n"
"Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>, public domain.\n"
"\n"
"Usage:\n"
"  start-stop-daemon -S|--start options ... -- arguments ...\n"
"  start-stop-daemon -K|--stop options ...\n"
"  start-stop-daemon -H|--help\n"
"  start-stop-daemon -V|--version\n"
"\n"
"Options (at least one of --exec|--pidfile|--user is required):\n"
"  -x|--exec <executable>        program to start/check if it is running\n"
"  -p|--pidfile <pid-file>       pid file to check\n"
"  -c|--chuid <name|uid[:group|gid]>\n"
"               change to this user/group before starting process\n"
"  -u|--user <username>|<uid>    stop processes owned by this user\n"
"  -n|--name <process-name>      stop processes with this name\n"
"  -s|--signal <signal>          signal to send (default TERM)\n"
"  -a|--startas <pathname>       program to start (default is <executable>)\n"
"  -N|--nicelevel <incr>         add incr to the process's nice level\n"
"  -b|--background               force the process to detach\n"
"  -m|--make-pidfile             create the pidfile before starting\n"
"  -R|--retry <schedule>         check whether processes die, and retry\n"
"  -t|--test                     test mode, don't do anything\n"
"  -o|--oknodo                   exit status 0 (not 1) if nothing done\n"
"  -q|--quiet                    be more quiet\n"
"  -v|--verbose                  be more verbose\n"
"Retry <schedule> is <item>|/<item>/... where <item> is one of\n"
" -<signal-num>|[-]<signal-name>  send that signal\n"
" <timeout>                       wait that many seconds\n"
" forever                         repeat remainder forever\n"
"or <schedule> may be just <timeout>, meaning <signal>/<timeout>/KILL/<timeout>\n"
"\n"
"Exit status:  0 = done      1 = nothing done (=> 0 if --oknodo)\n"
"              3 = trouble   2 = with --retry, processes wouldn't die\n");
}


static void
badusage(const char *msg)
{
        if (msg)
                fprintf(stderr, "%s: %s\n", progname, msg);
        fprintf(stderr, "Try `%s --help' for more information.\n", progname);
        exit(3);
}

struct sigpair {
        const char *name;
        int signal;
};

const struct sigpair siglist[] = {
        { "ABRT",       SIGABRT },
        { "ALRM",       SIGALRM },
        { "FPE",        SIGFPE  },
        { "HUP",        SIGHUP  },
        { "ILL",        SIGILL  },
        { "INT",        SIGINT  },
        { "KILL",       SIGKILL },
        { "PIPE",       SIGPIPE },
        { "QUIT",       SIGQUIT },
        { "SEGV",       SIGSEGV },
        { "TERM",       SIGTERM },
        { "USR1",       SIGUSR1 },
        { "USR2",       SIGUSR2 },
        { "CHLD",       SIGCHLD },
        { "CONT",       SIGCONT },
        { "STOP",       SIGSTOP },
        { "TSTP",       SIGTSTP },
        { "TTIN",       SIGTTIN },
        { "TTOU",       SIGTTOU }
};

static int parse_integer (const char *string, int *value_r) {
        unsigned long ul;
        char *ep;

        if (!string[0])
                return -1;

        ul= strtoul(string,&ep,10);
        if (ul > INT_MAX || *ep != '\0')
                return -1;

        *value_r= ul;
        return 0;
}

static int parse_signal (const char *signal_str, int *signal_nr)
{
        unsigned int i;

        if (parse_integer(signal_str, signal_nr) == 0)
                return 0;

        for (i = 0; i < sizeof (siglist) / sizeof (siglist[0]); i++) {
                if (strcmp (signal_str, siglist[i].name) == 0) {
                        *signal_nr = siglist[i].signal;
                        return 0;
                }
        }
        return -1;
}

static void
parse_schedule_item(const char *string, struct schedule_item *item) {
        const char *after_hyph;

        if (!strcmp(string,"forever")) {
                item->type = sched_forever;
        } else if (isdigit(string[0])) {
                item->type = sched_timeout;
                if (parse_integer(string, &item->value) != 0)
                        badusage("invalid timeout value in schedule");
        } else if ((after_hyph = string + (string[0] == '-')) &&
                   parse_signal(after_hyph, &item->value) == 0) {
                item->type = sched_signal;
        } else {
                badusage("invalid schedule item (must be [-]<signal-name>, "
                         "-<signal-number>, <timeout> or `forever'");
        }
}

static void
parse_schedule(const char *schedule_str) {
        char item_buf[20];
        const char *slash;
        int count, repeatat;
        ptrdiff_t str_len;

        count = 0;
        for (slash = schedule_str; *slash; slash++)
                if (*slash == '/')
                        count++;

        schedule_length = (count == 0) ? 4 : count+1;
        schedule = xmalloc(sizeof(*schedule) * schedule_length);

        if (count == 0) {
                schedule[0].type = sched_signal;
                schedule[0].value = signal_nr;
                parse_schedule_item(schedule_str, &schedule[1]);
                if (schedule[1].type != sched_timeout) {
                        badusage ("--retry takes timeout, or schedule list"
                                  " of at least two items");
                }
                schedule[2].type = sched_signal;
                schedule[2].value = SIGKILL;
                schedule[3]= schedule[1];
        } else {
                count = 0;
                repeatat = -1;
                while (schedule_str != NULL) {
                        slash = strchr(schedule_str,'/');
                        str_len = slash ? slash - schedule_str : strlen(schedule_str);
                        if (str_len >= (ptrdiff_t)sizeof(item_buf))
                                badusage("invalid schedule item: far too long"
                                         " (you must delimit items with slashes)");
                        memcpy(item_buf, schedule_str, str_len);
                        item_buf[str_len] = 0;
                        schedule_str = slash ? slash+1 : NULL;

                        parse_schedule_item(item_buf, &schedule[count]);
                        if (schedule[count].type == sched_forever) {
                                if (repeatat >= 0)
                                        badusage("invalid schedule: `forever'"
                                                 " appears more than once");
                                repeatat = count;
                                continue;
                        }
                        count++;
                }
                if (repeatat >= 0) {
                        schedule[count].type = sched_goto;
                        schedule[count].value = repeatat;
                        count++;
                }
                assert(count == schedule_length);
        }
}

static void
parse_options(int argc, char * const *argv)
{
        static struct option longopts[] = {
                { "help",         0, NULL, 'H'},
                { "stop",         0, NULL, 'K'},
                { "start",        0, NULL, 'S'},
                { "version",      0, NULL, 'V'},
                { "startas",      1, NULL, 'a'},
                { "name",         1, NULL, 'n'},
                { "oknodo",       0, NULL, 'o'},
                { "pidfile",      1, NULL, 'p'},
                { "quiet",        0, NULL, 'q'},
                { "signal",       1, NULL, 's'},
                { "test",         0, NULL, 't'},
                { "user",         1, NULL, 'u'},
                { "chroot",       1, NULL, 'r'},
                { "verbose",      0, NULL, 'v'},
                { "exec",         1, NULL, 'x'},
                { "chuid",        1, NULL, 'c'},
                { "nicelevel",    1, NULL, 'N'},
                { "background",   0, NULL, 'b'},
                { "make-pidfile", 0, NULL, 'm'},
                { "retry",        1, NULL, 'R'},
                { NULL,         0, NULL, 0}
        };
        int c;

        for (;;) {
                c = getopt_long(argc, argv, "HKSVa:n:op:qr:s:tu:vx:c:N:bmR:",
                                longopts, (int *) 0);
                if (c == -1)
                        break;
                switch (c) {
                case 'H':  /* --help */
                        do_help();
                        exit(0);
                case 'K':  /* --stop */
                        stop = 1;
                        break;
                case 'S':  /* --start */
                        start = 1;
                        break;
                case 'V':  /* --version */
                        printf("start-stop-daemon " VERSION "\n");
                        exit(0);
                case 'a':  /* --startas <pathname> */
                        startas = optarg;
                        break;
                case 'n':  /* --name <process-name> */
                        cmdname = optarg;
                        break;
                case 'o':  /* --oknodo */
                        exitnodo = 0;
                        break;
                case 'p':  /* --pidfile <pid-file> */
                        pidfile = optarg;
                        break;
                case 'q':  /* --quiet */
                        quietmode = 1;
                        break;
                case 's':  /* --signal <signal> */
                        signal_str = optarg;
                        break;
                case 't':  /* --test */
                        testmode = 1;
                        break;
                case 'u':  /* --user <username>|<uid> */
                        userspec = optarg;
                        break;
                case 'v':  /* --verbose */
                        quietmode = -1;
                        break;
                case 'x':  /* --exec <executable> */
                        execname = optarg;
                        break;
                case 'c':  /* --chuid <username>|<uid> */
                        /* we copy the string just in case we need the
                         * argument later. */
                        changeuser = strdup(optarg);
                        changeuser = strtok(changeuser, ":");
                        changegroup = strtok(NULL, ":");
                        break;
                case 'r':  /* --chroot /new/root */
                        changeroot = optarg;
                        break;
                case 'N':  /* --nice */
                        nicelevel = atoi(optarg);
                        break;
                case 'b':  /* --background */
                        background = 1;
                        break;
                case 'm':  /* --make-pidfile */
                        mpidfile = 1;
                        break;
                case 'R':  /* --retry <schedule>|<timeout> */
                        schedule_str = optarg;
                        break;
                default:
                        badusage(NULL);  /* message printed by getopt */
                }
        }

        if (signal_str != NULL) {
                if (parse_signal (signal_str, &signal_nr) != 0)
                        badusage("signal value must be numeric or name"
                                 " of signal (KILL, INTR, ...)");
        }

        if (schedule_str != NULL) {
                parse_schedule(schedule_str);
        }

        if (start == stop)
                badusage("need one of --start or --stop");

        if (!execname && !pidfile && !userspec && !cmdname)
                badusage("need at least one of --exec, --pidfile, --user or --name");

        if (!startas)
                startas = execname;

        if (start && !startas)
                badusage("--start needs --exec or --startas");

        if (mpidfile && pidfile == NULL)
                badusage("--make-pidfile is only relevant with --pidfile");

        if (background && !start)
                badusage("--background is only relevant with --start");

}

static int
pid_is_exec(pid_t pid, const struct stat *esb)
{
        struct stat sb;
        char buf[32];

        sprintf(buf, "/proc/%d/exe", pid);
        if (stat(buf, &sb) != 0)
                return 0;
        return (sb.st_dev == esb->st_dev && sb.st_ino == esb->st_ino);
}


static int
pid_is_user(pid_t pid, uid_t uid)
{
        struct stat sb;
        char buf[32];

        sprintf(buf, "/proc/%d", pid);
        if (stat(buf, &sb) != 0)
                return 0;
        return (sb.st_uid == uid);
}


static int
pid_is_cmd(pid_t pid, const char *name)
{
        char buf[32];
        FILE *f;
        int c;

        sprintf(buf, "/proc/%d/stat", pid);
        f = fopen(buf, "r");
        if (!f)
                return 0;
        while ((c = getc(f)) != EOF && c != '(')
                ;
        if (c != '(') {
                fclose(f);
                return 0;
        }
        /* this hopefully handles command names containing ')' */
        while ((c = getc(f)) != EOF && c == *name)
                name++;
        fclose(f);
        return (c == ')' && *name == '\0');
}


static void
check(pid_t pid)
{
        if (execname && !pid_is_exec(pid, &exec_stat))
                return;
        if (userspec && !pid_is_user(pid, user_id))
                return;
        if (cmdname && !pid_is_cmd(pid, cmdname))
                return;
        push(&found, pid);
}

static void
do_pidfile(const char *name)
{
        FILE *f;
        pid_t pid;

        f = fopen(name, "r");
        if (f) {
                if (fscanf(f, "%d", &pid) == 1)
                        check(pid);
                fclose(f);
        } else if (errno != ENOENT)
                fatal("open pidfile %s: %s", name, strerror(errno));

}

/* WTA: this  needs to be an autoconf check for /proc/pid existance.
 */
static void
do_procinit(void)
{
        DIR *procdir;
        struct dirent *entry;
        int foundany;
        pid_t pid;

        procdir = opendir("/proc");
        if (!procdir)
                fatal("opendir /proc: %s", strerror(errno));

        foundany = 0;
        while ((entry = readdir(procdir)) != NULL) {
                if (sscanf(entry->d_name, "%d", &pid) != 1)
                        continue;
                foundany++;
                check(pid);
        }
        closedir(procdir);
        if (!foundany)
                fatal("nothing in /proc - not mounted?");
}

static void
do_findprocs(void)
{
        clear(&found);
        
        if (pidfile)
                do_pidfile(pidfile);
        else
                do_procinit();
}

/* return 1 on failure */
static void
do_stop(int signal_nr, int quietmode, int *n_killed, int *n_notkilled, int retry_nr)
{
        struct pid_list *p;

        do_findprocs();
 
        *n_killed = 0;
        *n_notkilled = 0;
 
        if (!found)
                return;
 
        clear(&killed);

        for (p = found; p; p = p->next) {
                if (testmode)
                        printf("Would send signal %d to %d.\n",
                               signal_nr, p->pid);
                else if (kill(p->pid, signal_nr) == 0) {
                        push(&killed, p->pid);
                        (*n_killed)++;
                } else {
                        printf("%s: warning: failed to kill %d: %s\n",
                               progname, p->pid, strerror(errno));
                        (*n_notkilled)++;
                }
        }
        if (quietmode < 0 && killed) {
                printf("Stopped %s (pid", what_stop);
                for (p = killed; p; p = p->next)
                        printf(" %d", p->pid);
                putchar(')');
                if (retry_nr > 0)
                        printf(", retry #%d", retry_nr);
                printf(".\n");
        }
}


static void
set_what_stop(const char *str)
{
        strncpy(what_stop, str, sizeof(what_stop));
        what_stop[sizeof(what_stop)-1] = '\0';
}

static int
run_stop_schedule(void)
{
        int r, position, n_killed, n_notkilled, value, ratio, anykilled, retry_nr;
        struct timeval stopat, before, after, interval, maxinterval;

        if (testmode) {
                if (schedule != NULL) {
                        printf("Ignoring --retry in test mode\n");
                        schedule = NULL;
                }
        }

        if (cmdname)
                set_what_stop(cmdname);
        else if (execname)
                set_what_stop(execname);
        else if (pidfile)
                sprintf(what_stop, "process in pidfile `%.200s'", pidfile);
        else if (userspec)
                sprintf(what_stop, "process(es) owned by `%.200s'", userspec);
        else
                fatal("internal error, please report");

        anykilled = 0;
        retry_nr = 0;

        if (schedule == NULL) {
                do_stop(signal_nr, quietmode, &n_killed, &n_notkilled, 0);
                if (n_notkilled > 0 && quietmode <= 0)
                        printf("%d pids were not killed\n", n_notkilled);
                if (n_killed)
                        anykilled = 1;
                goto x_finished;
        }

        for (position = 0; position < schedule_length; ) {
                value= schedule[position].value;
                n_notkilled = 0;

                switch (schedule[position].type) {

                case sched_goto:
                        position = value;
                        continue;

                case sched_signal:
                        do_stop(value, quietmode, &n_killed, &n_notkilled, retry_nr++);
                        if (!n_killed)
                                goto x_finished;
                        else
                                anykilled = 1;
                        goto next_item;

                case sched_timeout:
 /* We want to keep polling for the processes, to see if they've exited,
  * or until the timeout expires.
  *
  * This is a somewhat complicated algorithm to try to ensure that we
  * notice reasonably quickly when all the processes have exited, but
  * don't spend too much CPU time polling.  In particular, on a fast
  * machine with quick-exiting daemons we don't want to delay system
  * shutdown too much, whereas on a slow one, or where processes are
  * taking some time to exit, we want to increase the polling
  * interval.
  *
  * The algorithm is as follows: we measure the elapsed time it takes
  * to do one poll(), and wait a multiple of this time for the next
  * poll.  However, if that would put us past the end of the timeout
  * period we wait only as long as the timeout period, but in any case
  * we always wait at least MIN_POLL_INTERVAL (20ms).  The multiple
  * (`ratio') starts out as 2, and increases by 1 for each poll to a
  * maximum of 10; so we use up to between 30% and 10% of the
  * machine's resources (assuming a few reasonable things about system
  * performance).
  */
                        xgettimeofday(&stopat);
                        stopat.tv_sec += value;
                        ratio = 1;
                        for (;;) {
                                xgettimeofday(&before);
                                if (timercmp(&before,&stopat,>))
                                        goto next_item;

                                do_stop(0, 1, &n_killed, &n_notkilled, 0);
                                if (!n_killed)
                                        goto x_finished;

                                xgettimeofday(&after);

                                if (!timercmp(&after,&stopat,<))
                                        goto next_item;

                                if (ratio < 10)
                                        ratio++;

 TVCALC(interval,    ratio * (TVELEM(&after) - TVELEM(&before) + TVADJUST));
 TVCALC(maxinterval,          TVELEM(&stopat) - TVELEM(&after) + TVADJUST);

                                if (timercmp(&interval,&maxinterval,>))
                                        interval = maxinterval;

                                if (interval.tv_sec == 0 &&
                                    interval.tv_usec <= MIN_POLL_INTERVAL)
                                        interval.tv_usec = MIN_POLL_INTERVAL;

                                r = select(0,0,0,0,&interval);
                                if (r < 0 && errno != EINTR)
                                        fatal("select() failed for pause: %s",
                                              strerror(errno));
                        }

                default:
                        assert(!"schedule[].type value must be valid");

                }

        next_item:
                position++;
        }

        if (quietmode <= 0)
                printf("Program %s, %d process(es), refused to die.\n",
                       what_stop, n_killed);

        return 2;

x_finished:
        if (!anykilled) {
                if (quietmode <= 0)
                        printf("No %s found running; none killed.\n", what_stop);
                return exitnodo;
        } else {
                return 0;
        }
}

/*
int main(int argc, char **argv) NONRETURNING;
*/

int
main(int argc, char **argv)
{
        progname = argv[0];

        parse_options(argc, argv);
        argc -= optind;
        argv += optind;

        if (execname && stat(execname, &exec_stat))
                fatal("stat %s: %s", execname, strerror(errno));

        if (userspec && sscanf(userspec, "%d", &user_id) != 1) {
                struct passwd *pw;

                pw = getpwnam(userspec);
                if (!pw)
                        fatal("user `%s' not found\n", userspec);

                user_id = pw->pw_uid;
        }

        if (changegroup && sscanf(changegroup, "%d", &runas_gid) != 1) {
                struct group *gr = getgrnam(changegroup);
                if (!gr)
                        fatal("group `%s' not found\n", changegroup);
                runas_gid = gr->gr_gid;
        }
        if (changeuser && sscanf(changeuser, "%d", &runas_uid) != 1) {
                struct passwd *pw = getpwnam(changeuser);
                if (!pw)
                        fatal("user `%s' not found\n", changeuser);
                runas_uid = pw->pw_uid;
                if (changegroup == NULL) { /* pass the default group of this user */
                        changegroup = ""; /* just empty */
                        runas_gid = pw->pw_gid;
                }
        }

        if (stop) {
                int i = run_stop_schedule();
                exit(i);
        }

        do_findprocs();

        if (found) {
                if (quietmode <= 0)
                        printf("%s already running.\n", execname);
                exit(exitnodo);
        }
        if (testmode) {
                printf("Would start %s ", startas);
                while (argc-- > 0)
                        printf("%s ", *argv++);
                if (changeuser != NULL) {
                        printf(" (as user %s[%d]", changeuser, runas_uid);
                        if (changegroup != NULL)
                                printf(", and group %s[%d])", changegroup, runas_gid);
                        else
                                printf(")");
                }
                if (changeroot != NULL)
                        printf(" in directory %s", changeroot);
                if (nicelevel)
                        printf(", and add %i to the priority", nicelevel);
                printf(".\n");
                exit(0);
        }
        if (quietmode < 0)
                printf("Starting %s...\n", startas);
        *--argv = startas;
        if (changeroot != NULL) {
                if (chdir(changeroot) < 0)
                        fatal("Unable to chdir() to %s", changeroot);
                if (chroot(changeroot) < 0)
                        fatal("Unable to chroot() to %s", changeroot);
        }
        if (changeuser != NULL) {
                if (setgid(runas_gid))
                        fatal("Unable to set gid to %d", runas_gid);
                if (initgroups(changeuser, runas_gid))
                        fatal("Unable to set initgroups() with gid %d", runas_gid);
                if (setuid(runas_uid))
                        fatal("Unable to set uid to %s", changeuser);
        }

        if (background) { /* ok, we need to detach this process */
                int i, fd;
                if (quietmode < 0)
                        printf("Detatching to start %s...", startas);
                i = fork();
                if (i<0) {
                        fatal("Unable to fork.\n");
                }
                if (i) { /* parent */
                        if (quietmode < 0)
                                printf("done.\n");
                        exit(0);
                }
                 /* child continues here */
                 /* now close all extra fds */
                for (i=getdtablesize()-1; i>=0; --i) close(i);
                 /* change tty */
                fd = open("/dev/tty", O_RDWR);
                ioctl(fd, TIOCNOTTY, 0);
                close(fd);
                chdir("/");
                umask(022); /* set a default for dumb programs */
                setpgid(0,0);  /* set the process group */
                fd=open("/dev/null", O_RDWR); /* stdin */
                dup(fd); /* stdout */
                dup(fd); /* stderr */
        }
        if (nicelevel) {
                if (nice(nicelevel))
                        fatal("Unable to alter nice level by %i: %s", nicelevel,
                                strerror(errno));
        }
        if (mpidfile && pidfile != NULL) { /* user wants _us_ to make the pidfile :) */
                FILE *pidf = fopen(pidfile, "w");
                pid_t pidt = getpid();
                if (pidf == NULL)
                        fatal("Unable to open pidfile `%s' for writing: %s", pidfile,
                                strerror(errno));
                fprintf(pidf, "%d\n", pidt);
                fclose(pidf);
        }
        execv(startas, argv);
        fatal("Unable to start %s: %s", startas, strerror(errno));
}

Name	Value
svn:eol-style	native
svn:keywords	Author Date Id Revision