source: MondoRescue/branches/2.2.5/mindi-busybox/miscutils/crond.c@ 1765

/* vi: set sw=4 ts=4: */
/*
 * crond -d[#] -c <crondir> -f -b
 *
 * run as root, but NOT setuid root
 *
 * Copyright 1994 Matthew Dillon (dillon@apollo.west.oic.com)
 * (version 2.3.2)
 * Vladimir Oleynik <dzo@simtreas.ru> (C) 2002
 *
 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
 */

#include <sys/syslog.h>
#include "libbb.h"

#ifndef CRONTABS
#define CRONTABS        "/var/spool/cron/crontabs"
#endif
#ifndef TMPDIR
#define TMPDIR          "/var/spool/cron"
#endif
#ifndef SENDMAIL
#define SENDMAIL        "sendmail"
#endif
#ifndef SENDMAIL_ARGS
#define SENDMAIL_ARGS   "-ti", "oem"
#endif
#ifndef CRONUPDATE
#define CRONUPDATE      "cron.update"
#endif
#ifndef MAXLINES
#define MAXLINES        256 /* max lines in non-root crontabs */
#endif

typedef struct CronFile {
    struct CronFile *cf_Next;
    struct CronLine *cf_LineBase;
    char *cf_User;      /* username                     */
    int cf_Ready;       /* bool: one or more jobs ready */
    int cf_Running;     /* bool: one or more jobs running */
    int cf_Deleted;     /* marked for deletion, ignore  */
} CronFile;

typedef struct CronLine {
    struct CronLine *cl_Next;
    char *cl_Shell;     /* shell command                        */
    pid_t cl_Pid;       /* running pid, 0, or armed (-1)        */
    int cl_MailFlag;    /* running pid is for mail              */
    int cl_MailPos;     /* 'empty file' size                    */
    char cl_Mins[60];   /* 0-59                                 */
    char cl_Hrs[24];    /* 0-23                                 */
    char cl_Days[32];   /* 1-31                                 */
    char cl_Mons[12];   /* 0-11                                 */
    char cl_Dow[7];     /* 0-6, beginning sunday                */
} CronLine;

#define RUN_RANOUT      1
#define RUN_RUNNING     2
#define RUN_FAILED      3

#define DaemonUid 0

#if ENABLE_DEBUG_CROND_OPTION
static unsigned DebugOpt;
#endif

static unsigned LogLevel = 8;
static const char *LogFile;
static const char *CDir = CRONTABS;

static void startlogger(void);

static void CheckUpdates(void);
static void SynchronizeDir(void);
static int TestJobs(time_t t1, time_t t2);
static void RunJobs(void);
static int CheckJobs(void);

static void RunJob(const char *user, CronLine * line);

#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
static void EndJob(const char *user, CronLine * line);
#else
#define EndJob(user, line)  line->cl_Pid = 0
#endif

static void DeleteFile(const char *userName);

static CronFile *FileBase;


static void crondlog(const char *ctl, ...)
{
    va_list va;
    const char *fmt;
    int level = (int) (ctl[0] & 0xf);
    int type = level == 20 ?
        LOG_ERR : ((ctl[0] & 0100) ? LOG_WARNING : LOG_NOTICE);


    va_start(va, ctl);
    fmt = ctl + 1;
    if (level >= LogLevel) {

#if ENABLE_DEBUG_CROND_OPTION
        if (DebugOpt) {
            vfprintf(stderr, fmt, va);
        } else
#endif
        if (LogFile == 0) {
            vsyslog(type, fmt, va);
        } else {
#if !ENABLE_DEBUG_CROND_OPTION
            int logfd = open(LogFile, O_WRONLY | O_CREAT | O_APPEND, 0600);
#else
            int logfd = open3_or_warn(LogFile, O_WRONLY | O_CREAT | O_APPEND, 0600);
#endif
            if (logfd >= 0) {
                vdprintf(logfd, fmt, va);
                close(logfd);
            }
        }
    }
    va_end(va);
    if (ctl[0] & 0200) {
        exit(20);
    }
}

int crond_main(int ac, char **av);
int crond_main(int ac, char **av)
{
    unsigned opt;
    char *lopt, *Lopt, *copt;
    USE_DEBUG_CROND_OPTION(char *dopt;)

    opt_complementary = "f-b:b-f:S-L:L-S" USE_DEBUG_CROND_OPTION(":d-l");
    opterr = 0;         /* disable getopt 'errors' message. */
    opt = getopt32(av, "l:L:fbSc:" USE_DEBUG_CROND_OPTION("d:"),
            &lopt, &Lopt, &copt USE_DEBUG_CROND_OPTION(, &dopt));
    if (opt & 1) /* -l */
        LogLevel = xatou(lopt);
    if (opt & 2) /* -L */
        if (*Lopt)
            LogFile = Lopt;
    if (opt & 32) /* -c */
        if (*copt)
            CDir = copt;
#if ENABLE_DEBUG_CROND_OPTION
    if (opt & 64) { /* -d */
        DebugOpt = xatou(dopt);
        LogLevel = 0;
    }
#endif

    /* close stdin and stdout, stderr.
     * close unused descriptors -  don't need.
     * optional detach from controlling terminal
     */
    if (!(opt & 4))
        bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS, av);

    xchdir(CDir);
    signal(SIGHUP, SIG_IGN); /* ? original crond dies on HUP... */

    startlogger();  /* need if syslog mode selected */

    /*
     * main loop - synchronize to 1 second after the minute, minimum sleep
     *             of 1 second.
     */
    crondlog("\011%s " BB_VER " started, log level %d\n",
             applet_name, LogLevel);

    SynchronizeDir();

    {
        time_t t1 = time(NULL);
        time_t t2;
        long dt;
        int rescan = 60;
        short sleep_time = 60;

        write_pidfile("/var/run/crond.pid");
        for (;;) {
            sleep((sleep_time + 1) - (short) (time(NULL) % sleep_time));

            t2 = time(NULL);
            dt = t2 - t1;

            /*
             * The file 'cron.update' is checked to determine new cron
             * jobs.  The directory is rescanned once an hour to deal
             * with any screwups.
             *
             * check for disparity.  Disparities over an hour either way
             * result in resynchronization.  A reverse-indexed disparity
             * less then an hour causes us to effectively sleep until we
             * match the original time (i.e. no re-execution of jobs that
             * have just been run).  A forward-indexed disparity less then
             * an hour causes intermediate jobs to be run, but only once
             * in the worst case.
             *
             * when running jobs, the inequality used is greater but not
             * equal to t1, and less then or equal to t2.
             */

            if (--rescan == 0) {
                rescan = 60;
                SynchronizeDir();
            }
            CheckUpdates();
#if ENABLE_DEBUG_CROND_OPTION
            if (DebugOpt)
                crondlog("\005Wakeup dt=%d\n", dt);
#endif
            if (dt < -60 * 60 || dt > 60 * 60) {
                t1 = t2;
                crondlog("\111time disparity of %d minutes detected\n", dt / 60);
            } else if (dt > 0) {
                TestJobs(t1, t2);
                RunJobs();
                sleep(5);
                if (CheckJobs() > 0) {
                    sleep_time = 10;
                } else {
                    sleep_time = 60;
                }
                t1 = t2;
            }
        }
    }
    return 0; /* not reached */
}

static int ChangeUser(const char *user)
{
    struct passwd *pas;
    const char *err_msg;

    /*
     * Obtain password entry and change privileges
     */
    pas = getpwnam(user);
    if (pas == 0) {
        crondlog("\011failed to get uid for %s", user);
        return -1;
    }
    setenv("USER", pas->pw_name, 1);
    setenv("HOME", pas->pw_dir, 1);
    setenv("SHELL", DEFAULT_SHELL, 1);

    /*
     * Change running state to the user in question
     */
    err_msg = change_identity_e2str(pas);
    if (err_msg) {
        crondlog("\011%s for user %s", err_msg, user);
        return -1;
    }
    if (chdir(pas->pw_dir) < 0) {
        crondlog("\011chdir failed: %s: %m", pas->pw_dir);
        if (chdir(TMPDIR) < 0) {
            crondlog("\011chdir failed: %s: %m", TMPDIR);
            return -1;
        }
    }
    return pas->pw_uid;
}

static void startlogger(void)
{
    if (LogFile == 0) {
        openlog(applet_name, LOG_CONS | LOG_PID, LOG_CRON);
    }
#if ENABLE_DEBUG_CROND_OPTION
    else {              /* test logfile */
        int logfd;

        logfd = open3_or_warn(LogFile, O_WRONLY | O_CREAT | O_APPEND, 0600);
        if (logfd >= 0) {
            close(logfd);
        }
    }
#endif
}


static const char DowAry[] ALIGN1 =
    "sun""mon""tue""wed""thu""fri""sat"
    /* "Sun""Mon""Tue""Wed""Thu""Fri""Sat" */
;

static const char MonAry[] ALIGN1 =
    "jan""feb""mar""apr""may""jun""jul""aug""sep""oct""nov""dec"
    /* "Jan""Feb""Mar""Apr""May""Jun""Jul""Aug""Sep""Oct""Nov""Dec" */
;

static char *ParseField(char *user, char *ary, int modvalue, int off,
                const char *names, char *ptr)
/* 'names' is a pointer to a set of 3-char abbreviations */
{
    char *base = ptr;
    int n1 = -1;
    int n2 = -1;

    if (base == NULL) {
        return NULL;
    }

    while (*ptr != ' ' && *ptr != '\t' && *ptr != '\n') {
        int skip = 0;

        /* Handle numeric digit or symbol or '*' */

        if (*ptr == '*') {
            n1 = 0;     /* everything will be filled */
            n2 = modvalue - 1;
            skip = 1;
            ++ptr;
        } else if (*ptr >= '0' && *ptr <= '9') {
            if (n1 < 0) {
                n1 = strtol(ptr, &ptr, 10) + off;
            } else {
                n2 = strtol(ptr, &ptr, 10) + off;
            }
            skip = 1;
        } else if (names) {
            int i;

            for (i = 0; names[i]; i += 3) {
                /* was using strncmp before... */
                if (strncasecmp(ptr, &names[i], 3) == 0) {
                    ptr += 3;
                    if (n1 < 0) {
                        n1 = i / 3;
                    } else {
                        n2 = i / 3;
                    }
                    skip = 1;
                    break;
                }
            }
        }

        /* handle optional range '-' */

        if (skip == 0) {
            crondlog("\111failed user %s parsing %s\n", user, base);
            return NULL;
        }
        if (*ptr == '-' && n2 < 0) {
            ++ptr;
            continue;
        }

        /*
         * collapse single-value ranges, handle skipmark, and fill
         * in the character array appropriately.
         */

        if (n2 < 0) {
            n2 = n1;
        }
        if (*ptr == '/') {
            skip = strtol(ptr + 1, &ptr, 10);
        }
        /*
         * fill array, using a failsafe is the easiest way to prevent
         * an endless loop
         */

        {
            int s0 = 1;
            int failsafe = 1024;

            --n1;
            do {
                n1 = (n1 + 1) % modvalue;

                if (--s0 == 0) {
                    ary[n1 % modvalue] = 1;
                    s0 = skip;
                }
            }
            while (n1 != n2 && --failsafe);

            if (failsafe == 0) {
                crondlog("\111failed user %s parsing %s\n", user, base);
                return NULL;
            }
        }
        if (*ptr != ',') {
            break;
        }
        ++ptr;
        n1 = -1;
        n2 = -1;
    }

    if (*ptr != ' ' && *ptr != '\t' && *ptr != '\n') {
        crondlog("\111failed user %s parsing %s\n", user, base);
        return NULL;
    }

    while (*ptr == ' ' || *ptr == '\t' || *ptr == '\n') {
        ++ptr;
    }
#if ENABLE_DEBUG_CROND_OPTION
    if (DebugOpt) {
        int i;

        for (i = 0; i < modvalue; ++i) {
            crondlog("\005%d", ary[i]);
        }
        crondlog("\005\n");
    }
#endif

    return ptr;
}

static void FixDayDow(CronLine * line)
{
    int i;
    int weekUsed = 0;
    int daysUsed = 0;

    for (i = 0; i < (int)(ARRAY_SIZE(line->cl_Dow)); ++i) {
        if (line->cl_Dow[i] == 0) {
            weekUsed = 1;
            break;
        }
    }
    for (i = 0; i < (int)(ARRAY_SIZE(line->cl_Days)); ++i) {
        if (line->cl_Days[i] == 0) {
            daysUsed = 1;
            break;
        }
    }
    if (weekUsed && !daysUsed) {
        memset(line->cl_Days, 0, sizeof(line->cl_Days));
    }
    if (daysUsed && !weekUsed) {
        memset(line->cl_Dow, 0, sizeof(line->cl_Dow));
    }
}



static void SynchronizeFile(const char *fileName)
{
    int maxEntries = MAXLINES;
    int maxLines;
    char buf[1024];

    if (strcmp(fileName, "root") == 0) {
        maxEntries = 65535;
    }
    maxLines = maxEntries * 10;

    if (fileName) {
        FILE *fi;

        DeleteFile(fileName);

        fi = fopen(fileName, "r");
        if (fi != NULL) {
            struct stat sbuf;

            if (fstat(fileno(fi), &sbuf) == 0 && sbuf.st_uid == DaemonUid) {
                CronFile *file = xzalloc(sizeof(CronFile));
                CronLine **pline;

                file->cf_User = strdup(fileName);
                pline = &file->cf_LineBase;

                while (fgets(buf, sizeof(buf), fi) != NULL && --maxLines) {
                    CronLine line;
                    char *ptr;

                    trim(buf);
                    if (buf[0] == 0 || buf[0] == '#') {
                        continue;
                    }
                    if (--maxEntries == 0) {
                        break;
                    }
                    memset(&line, 0, sizeof(line));

#if ENABLE_DEBUG_CROND_OPTION
                    if (DebugOpt) {
                        crondlog("\111User %s Entry %s\n", fileName, buf);
                    }
#endif

                    /* parse date ranges */
                    ptr = ParseField(file->cf_User, line.cl_Mins, 60, 0, NULL, buf);
                    ptr = ParseField(file->cf_User, line.cl_Hrs, 24, 0, NULL, ptr);
                    ptr = ParseField(file->cf_User, line.cl_Days, 32, 0, NULL, ptr);
                    ptr = ParseField(file->cf_User, line.cl_Mons, 12, -1, MonAry, ptr);
                    ptr = ParseField(file->cf_User, line.cl_Dow, 7, 0, DowAry, ptr);

                    /* check failure */
                    if (ptr == NULL) {
                        continue;
                    }

                    /*
                     * fix days and dow - if one is not * and the other
                     * is *, the other is set to 0, and vise-versa
                     */

                    FixDayDow(&line);

                    *pline = xzalloc(sizeof(CronLine));
                    **pline = line;

                    /* copy command */
                    (*pline)->cl_Shell = strdup(ptr);

#if ENABLE_DEBUG_CROND_OPTION
                    if (DebugOpt) {
                        crondlog("\111    Command %s\n", ptr);
                    }
#endif

                    pline = &((*pline)->cl_Next);
                }
                *pline = NULL;

                file->cf_Next = FileBase;
                FileBase = file;

                if (maxLines == 0 || maxEntries == 0) {
                    crondlog("\111Maximum number of lines reached for user %s\n", fileName);
                }
            }
            fclose(fi);
        }
    }
}

static void CheckUpdates(void)
{
    FILE *fi;
    char buf[256];

    fi = fopen(CRONUPDATE, "r");
    if (fi != NULL) {
        remove(CRONUPDATE);
        while (fgets(buf, sizeof(buf), fi) != NULL) {
            SynchronizeFile(strtok(buf, " \t\r\n"));
        }
        fclose(fi);
    }
}

static void SynchronizeDir(void)
{
    /* Attempt to delete the database. */

    for (;;) {
        CronFile *file;

        for (file = FileBase; file && file->cf_Deleted; file = file->cf_Next);
        if (file == NULL) {
            break;
        }
        DeleteFile(file->cf_User);
    }

    /*
     * Remove cron update file
     *
     * Re-chdir, in case directory was renamed & deleted, or otherwise
     * screwed up.
     *
     * scan directory and add associated users
     */

    remove(CRONUPDATE);
    if (chdir(CDir) < 0) {
        crondlog("\311cannot find %s\n", CDir);
    }
    {
        DIR *dir = opendir(".");
        struct dirent *den;

        if (dir) {
            while ((den = readdir(dir))) {
                if (strchr(den->d_name, '.') != NULL) {
                    continue;
                }
                if (getpwnam(den->d_name)) {
                    SynchronizeFile(den->d_name);
                } else {
                    crondlog("\007ignoring %s\n", den->d_name);
                }
            }
            closedir(dir);
        } else {
            crondlog("\311cannot open current dir!\n");
        }
    }
}


/*
 *  DeleteFile() - delete user database
 *
 *  Note: multiple entries for same user may exist if we were unable to
 *  completely delete a database due to running processes.
 */

static void DeleteFile(const char *userName)
{
    CronFile **pfile = &FileBase;
    CronFile *file;

    while ((file = *pfile) != NULL) {
        if (strcmp(userName, file->cf_User) == 0) {
            CronLine **pline = &file->cf_LineBase;
            CronLine *line;

            file->cf_Running = 0;
            file->cf_Deleted = 1;

            while ((line = *pline) != NULL) {
                if (line->cl_Pid > 0) {
                    file->cf_Running = 1;
                    pline = &line->cl_Next;
                } else {
                    *pline = line->cl_Next;
                    free(line->cl_Shell);
                    free(line);
                }
            }
            if (file->cf_Running == 0) {
                *pfile = file->cf_Next;
                free(file->cf_User);
                free(file);
            } else {
                pfile = &file->cf_Next;
            }
        } else {
            pfile = &file->cf_Next;
        }
    }
}

/*
 * TestJobs()
 *
 * determine which jobs need to be run.  Under normal conditions, the
 * period is about a minute (one scan).  Worst case it will be one
 * hour (60 scans).
 */

static int TestJobs(time_t t1, time_t t2)
{
    int nJobs = 0;
    time_t t;

    /* Find jobs > t1 and <= t2 */

    for (t = t1 - t1 % 60; t <= t2; t += 60) {
        if (t > t1) {
            struct tm *tp = localtime(&t);
            CronFile *file;
            CronLine *line;

            for (file = FileBase; file; file = file->cf_Next) {
#if ENABLE_DEBUG_CROND_OPTION
                if (DebugOpt)
                    crondlog("\005FILE %s:\n", file->cf_User);
#endif
                if (file->cf_Deleted)
                    continue;
                for (line = file->cf_LineBase; line; line = line->cl_Next) {
#if ENABLE_DEBUG_CROND_OPTION
                    if (DebugOpt)
                        crondlog("\005    LINE %s\n", line->cl_Shell);
#endif
                    if (line->cl_Mins[tp->tm_min] && line->cl_Hrs[tp->tm_hour] &&
                        (line->cl_Days[tp->tm_mday] || line->cl_Dow[tp->tm_wday])
                        && line->cl_Mons[tp->tm_mon]) {
#if ENABLE_DEBUG_CROND_OPTION
                        if (DebugOpt) {
                            crondlog("\005    JobToDo: %d %s\n",
                                line->cl_Pid, line->cl_Shell);
                        }
#endif
                        if (line->cl_Pid > 0) {
                            crondlog("\010    process already running: %s %s\n",
                                file->cf_User, line->cl_Shell);
                        } else if (line->cl_Pid == 0) {
                            line->cl_Pid = -1;
                            file->cf_Ready = 1;
                            ++nJobs;
                        }
                    }
                }
            }
        }
    }
    return nJobs;
}

static void RunJobs(void)
{
    CronFile *file;
    CronLine *line;

    for (file = FileBase; file; file = file->cf_Next) {
        if (file->cf_Ready) {
            file->cf_Ready = 0;

            for (line = file->cf_LineBase; line; line = line->cl_Next) {
                if (line->cl_Pid < 0) {

                    RunJob(file->cf_User, line);

                    crondlog("\010USER %s pid %3d cmd %s\n",
                        file->cf_User, line->cl_Pid, line->cl_Shell);
                    if (line->cl_Pid < 0) {
                        file->cf_Ready = 1;
                    }
                    else if (line->cl_Pid > 0) {
                        file->cf_Running = 1;
                    }
                }
            }
        }
    }
}

/*
 * CheckJobs() - check for job completion
 *
 * Check for job completion, return number of jobs still running after
 * all done.
 */

static int CheckJobs(void)
{
    CronFile *file;
    CronLine *line;
    int nStillRunning = 0;

    for (file = FileBase; file; file = file->cf_Next) {
        if (file->cf_Running) {
            file->cf_Running = 0;

            for (line = file->cf_LineBase; line; line = line->cl_Next) {
                if (line->cl_Pid > 0) {
                    int status;
                    int r = wait4(line->cl_Pid, &status, WNOHANG, NULL);

                    if (r < 0 || r == line->cl_Pid) {
                        EndJob(file->cf_User, line);
                        if (line->cl_Pid) {
                            file->cf_Running = 1;
                        }
                    } else if (r == 0) {
                        file->cf_Running = 1;
                    }
                }
            }
        }
        nStillRunning += file->cf_Running;
    }
    return nStillRunning;
}


#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
static void
ForkJob(const char *user, CronLine * line, int mailFd,
        const char *prog, const char *cmd, const char *arg, const char *mailf)
{
    /* Fork as the user in question and run program */
    pid_t pid = fork();

    line->cl_Pid = pid;
    if (pid == 0) {
        /* CHILD */

        /* Change running state to the user in question */

        if (ChangeUser(user) < 0) {
            exit(0);
        }
#if ENABLE_DEBUG_CROND_OPTION
        if (DebugOpt) {
            crondlog("\005Child Running %s\n", prog);
        }
#endif

        if (mailFd >= 0) {
            dup2(mailFd, mailf != NULL);
            dup2((mailf ? mailFd : 1), 2);
            close(mailFd);
        }
        execl(prog, prog, cmd, arg, NULL);
        crondlog("\024cannot exec, user %s cmd %s %s %s\n", user, prog, cmd, arg);
        if (mailf) {
            fdprintf(1, "Exec failed: %s -c %s\n", prog, arg);
        }
        exit(0);
    } else if (pid < 0) {
        /* FORK FAILED */
        crondlog("\024cannot fork, user %s\n", user);
        line->cl_Pid = 0;
        if (mailf) {
            remove(mailf);
        }
    } else if (mailf) {
        /* PARENT, FORK SUCCESS
         * rename mail-file based on pid of process
         */
        char mailFile2[128];

        snprintf(mailFile2, sizeof(mailFile2), TMPDIR "/cron.%s.%d", user, pid);
        rename(mailf, mailFile2);
    }
    /*
     * Close the mail file descriptor.. we can't just leave it open in
     * a structure, closing it later, because we might run out of descriptors
     */

    if (mailFd >= 0) {
        close(mailFd);
    }
}

static void RunJob(const char *user, CronLine * line)
{
    char mailFile[128];
    int mailFd;

    line->cl_Pid = 0;
    line->cl_MailFlag = 0;

    /* open mail file - owner root so nobody can screw with it. */

    snprintf(mailFile, sizeof(mailFile), TMPDIR "/cron.%s.%d", user, getpid());
    mailFd = open(mailFile, O_CREAT | O_TRUNC | O_WRONLY | O_EXCL | O_APPEND, 0600);

    if (mailFd >= 0) {
        line->cl_MailFlag = 1;
        fdprintf(mailFd, "To: %s\nSubject: cron: %s\n\n", user,
            line->cl_Shell);
        line->cl_MailPos = lseek(mailFd, 0, SEEK_CUR);
    } else {
        crondlog("\024cannot create mail file user %s file %s, output to /dev/null\n", user, mailFile);
    }

    ForkJob(user, line, mailFd, DEFAULT_SHELL, "-c", line->cl_Shell, mailFile);
}

/*
 * EndJob - called when job terminates and when mail terminates
 */

static void EndJob(const char *user, CronLine * line)
{
    int mailFd;
    char mailFile[128];
    struct stat sbuf;

    /* No job */

    if (line->cl_Pid <= 0) {
        line->cl_Pid = 0;
        return;
    }

    /*
     * End of job and no mail file
     * End of sendmail job
     */

    snprintf(mailFile, sizeof(mailFile), TMPDIR "/cron.%s.%d", user, line->cl_Pid);
    line->cl_Pid = 0;

    if (line->cl_MailFlag != 1) {
        return;
    }
    line->cl_MailFlag = 0;

    /*
     * End of primary job - check for mail file.  If size has increased and
     * the file is still valid, we sendmail it.
     */

    mailFd = open(mailFile, O_RDONLY);
    remove(mailFile);
    if (mailFd < 0) {
        return;
    }

    if (fstat(mailFd, &sbuf) < 0 || sbuf.st_uid != DaemonUid
     || sbuf.st_nlink != 0 || sbuf.st_size == line->cl_MailPos
     || !S_ISREG(sbuf.st_mode)
    ) {
        close(mailFd);
        return;
    }
    ForkJob(user, line, mailFd, SENDMAIL, SENDMAIL_ARGS, NULL);
}
#else
/* crond without sendmail */

static void RunJob(const char *user, CronLine * line)
{
    /* Fork as the user in question and run program */
    pid_t pid = fork();

    if (pid == 0) {
        /* CHILD */

        /* Change running state to the user in question */

        if (ChangeUser(user) < 0) {
            exit(0);
        }
#if ENABLE_DEBUG_CROND_OPTION
        if (DebugOpt) {
            crondlog("\005Child Running %s\n", DEFAULT_SHELL);
        }
#endif

        execl(DEFAULT_SHELL, DEFAULT_SHELL, "-c", line->cl_Shell, NULL);
        crondlog("\024cannot exec, user %s cmd %s -c %s\n", user,
                 DEFAULT_SHELL, line->cl_Shell);
        exit(0);
    } else if (pid < 0) {
        /* FORK FAILED */
        crondlog("\024cannot, user %s\n", user);
        pid = 0;
    }
    line->cl_Pid = pid;
}
#endif /* ENABLE_FEATURE_CROND_CALL_SENDMAIL */