lib/pidfile.c

ソースコードを見る。

関数
pid_t	pidfile_pid (const char *name)
void	pidfile_create (const char *program_name)

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関数

pid_t pidfile_pid

(

const char *

name

)

pidfile.c の 31 行で定義されています。

参照先 fcntl_lock()・fd・process_exists_by_pid()・sys_open().

参照元 cli_send_mailslot()・parse_dest()・pidfile_create()・status_page()・stop_nmbd()・stop_smbd()・stop_winbindd().

{
        int fd;
        char pidstr[20];
        pid_t pid;
        unsigned int ret;
        pstring pidFile;

        slprintf(pidFile, sizeof(pidFile)-1, "%s/%s.pid", lp_piddir(), name);

        fd = sys_open(pidFile, O_NONBLOCK | O_RDONLY, 0644);
        if (fd == -1) {
                return 0;
        }

        ZERO_ARRAY(pidstr);

        if (read(fd, pidstr, sizeof(pidstr)-1) <= 0) {
                goto noproc;
        }

        ret = atoi(pidstr);

        if (ret == 0) {
                /* Obviously we had some garbage in the pidfile... */
                DEBUG(1, ("Could not parse contents of pidfile %s\n",
                          pidFile));
                goto noproc;
        }
        
        pid = (pid_t)ret;
        if (!process_exists_by_pid(pid)) {
                goto noproc;
        }

        if (fcntl_lock(fd,SMB_F_SETLK,0,1,F_RDLCK)) {
                /* we could get the lock - it can't be a Samba process */
                goto noproc;
        }

        close(fd);
        return (pid_t)ret;

 noproc:
        close(fd);
        unlink(pidFile);
        return 0;
}

void pidfile_create

(

const char *

program_name

)

pidfile.c の 81 行で定義されています。

参照先 buf・dyn_CONFIGFILE・errno・fcntl_lock()・fd・name・pidfile_pid()・strerror()・sys_getpid()・sys_open().

参照元 main().

{
        int     fd;
        char    buf[20];
        char    *short_configfile;
        pstring name;
        pstring pidFile;
        pid_t pid;

        /* Add a suffix to the program name if this is a process with a
         * none default configuration file name. */
        if (strcmp( CONFIGFILE, dyn_CONFIGFILE) == 0) {
                strncpy( name, program_name, sizeof( name)-1);
        } else {
                short_configfile = strrchr( dyn_CONFIGFILE, '/');
                if (short_configfile == NULL) {
                        /* conf file in current directory */
                        short_configfile = dyn_CONFIGFILE;
                } else {
                        /* full/relative path provided */
                        short_configfile++;
                }
                slprintf( name, sizeof( name)-1, "%s-%s", program_name,
                          short_configfile );
        }

        slprintf(pidFile, sizeof(pidFile)-1, "%s/%s.pid", lp_piddir(), name);

        pid = pidfile_pid(name);
        if (pid != 0) {
                DEBUG(0,("ERROR: %s is already running. File %s exists and process id %d is running.\n", 
                         name, pidFile, (int)pid));
                exit(1);
        }

        fd = sys_open(pidFile, O_NONBLOCK | O_CREAT | O_WRONLY | O_EXCL, 0644);
        if (fd == -1) {
                DEBUG(0,("ERROR: can't open %s: Error was %s\n", pidFile, 
                         strerror(errno)));
                exit(1);
        }

        if (fcntl_lock(fd,SMB_F_SETLK,0,1,F_WRLCK)==False) {
                DEBUG(0,("ERROR: %s : fcntl lock of file %s failed. Error was %s\n",  
              name, pidFile, strerror(errno)));
                exit(1);
        }

        memset(buf, 0, sizeof(buf));
        slprintf(buf, sizeof(buf) - 1, "%u\n", (unsigned int) sys_getpid());
        if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf)) {
                DEBUG(0,("ERROR: can't write to file %s: %s\n", 
                         pidFile, strerror(errno)));
                exit(1);
        }
        /* Leave pid file open & locked for the duration... */
}

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