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Annotation of embedaddon/pimd/libite/pidfile.c, revision 1.1

1.1     ! misho       1: /*     $OpenBSD: pidfile.c,v 1.11 2015/06/03 02:24:36 millert Exp $    */
        !             2: /*     $NetBSD: pidfile.c,v 1.4 2001/02/19 22:43:42 cgd Exp $  */
        !             3: 
        !             4: /*-
        !             5:  * Copyright (c) 1999 The NetBSD Foundation, Inc.
        !             6:  * All rights reserved.
        !             7:  *
        !             8:  * This code is derived from software contributed to The NetBSD Foundation
        !             9:  * by Jason R. Thorpe.
        !            10:  *
        !            11:  * Redistribution and use in source and binary forms, with or without
        !            12:  * modification, are permitted provided that the following conditions
        !            13:  * are met:
        !            14:  * 1. Redistributions of source code must retain the above copyright
        !            15:  *    notice, this list of conditions and the following disclaimer.
        !            16:  * 2. Redistributions in binary form must reproduce the above copyright
        !            17:  *    notice, this list of conditions and the following disclaimer in the
        !            18:  *    documentation and/or other materials provided with the distribution.
        !            19:  *
        !            20:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
        !            21:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
        !            22:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
        !            23:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
        !            24:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
        !            25:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
        !            26:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
        !            27:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
        !            28:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
        !            29:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
        !            30:  * POSSIBILITY OF SUCH DAMAGE.
        !            31:  */
        !            32: 
        !            33: #include <sys/types.h>
        !            34: #include <errno.h>
        !            35: #include <paths.h>
        !            36: #include <stdio.h>
        !            37: #include <stdlib.h>
        !            38: #include <unistd.h>
        !            39: 
        !            40: #ifndef pidfile
        !            41: static char *pidfile_path = NULL;
        !            42: static pid_t pidfile_pid;
        !            43: 
        !            44: static void pidfile_cleanup(void);
        !            45: 
        !            46: const  char *__pidfile_name = NULL;
        !            47: extern char *__progname;
        !            48: 
        !            49: int
        !            50: pidfile(const char *basename)
        !            51: {
        !            52:        int save_errno;
        !            53:        pid_t pid;
        !            54:        FILE *f;
        !            55: 
        !            56:        if (basename == NULL)
        !            57:                basename = __progname;
        !            58: 
        !            59:        if (pidfile_path != NULL) {
        !            60:                free(pidfile_path);
        !            61:                pidfile_path = NULL;
        !            62:                __pidfile_name = NULL;
        !            63:        }
        !            64: 
        !            65:        /* _PATH_VARRUN includes trailing / */
        !            66:        if (asprintf(&pidfile_path, "%s%s.pid", _PATH_VARRUN, basename) == -1)
        !            67:                return (-1);
        !            68: 
        !            69:        if ((f = fopen(pidfile_path, "w")) == NULL) {
        !            70:                save_errno = errno;
        !            71:                free(pidfile_path);
        !            72:                pidfile_path = NULL;
        !            73:                errno = save_errno;
        !            74:                return (-1);
        !            75:        }
        !            76: 
        !            77:        pid = getpid();
        !            78:        if (fprintf(f, "%ld\n", (long)pid) <= 0 || fflush(f) != 0) {
        !            79:                save_errno = errno;
        !            80:                (void) fclose(f);
        !            81:                (void) unlink(pidfile_path);
        !            82:                free(pidfile_path);
        !            83:                pidfile_path = NULL;
        !            84:                errno = save_errno;
        !            85:                return (-1);
        !            86:        }
        !            87:        (void) fclose(f);
        !            88: 
        !            89:        /*
        !            90:         * LITE extension, no need to set up another atexit() handler
        !            91:         * if user only called us to update the mtime of the PID file
        !            92:         */
        !            93:        if (pidfile_pid == pid)
        !            94:                return (0);
        !            95: 
        !            96:        pidfile_pid = pid;
        !            97:        if (atexit(pidfile_cleanup) < 0) {
        !            98:                save_errno = errno;
        !            99:                (void) unlink(pidfile_path);
        !           100:                free(pidfile_path);
        !           101:                pidfile_path = NULL;
        !           102:                pidfile_pid = 0;
        !           103:                errno = save_errno;
        !           104:                return (-1);
        !           105:        }
        !           106:        __pidfile_name = pidfile_path;
        !           107: 
        !           108:        return (0);
        !           109: }
        !           110: 
        !           111: static void
        !           112: pidfile_cleanup(void)
        !           113: {
        !           114: 
        !           115:        if (pidfile_path != NULL && pidfile_pid == getpid())
        !           116:                (void) unlink(pidfile_path);
        !           117: }
        !           118: #endif