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Annotation of embedaddon/mrouted/pidfile.c, revision 1.1

1.1     ! misho       1: /*     $OpenBSD: pidfile.c,v 1.8 2008/06/26 05:42:05 ray 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/param.h>
        !            34: #include <errno.h>
        !            35: #include <paths.h>
        !            36: #include <stdio.h>
        !            37: #include <stdlib.h>
        !            38: #include <unistd.h>
        !            39: 
        !            40: static char *pidfile_path;
        !            41: static pid_t pidfile_pid;
        !            42: 
        !            43: static void pidfile_cleanup(void);
        !            44: 
        !            45: extern char *__progname;
        !            46: 
        !            47: int
        !            48: pidfile(const char *basename)
        !            49: {
        !            50:        int save_errno, result;
        !            51:        pid_t pid;
        !            52:        FILE *f;
        !            53: 
        !            54:        if (basename == NULL)
        !            55:                basename = __progname;
        !            56: 
        !            57:        if (pidfile_path != NULL) {
        !            58:                free(pidfile_path);
        !            59:                pidfile_path = NULL;
        !            60:        }
        !            61: 
        !            62:        /* _PATH_VARRUN includes trailing / */
        !            63:        result = asprintf(&pidfile_path, "%s%s.pid", _PATH_VARRUN, basename);
        !            64:        if (result == -1 || pidfile_path == NULL)
        !            65:                return (-1);
        !            66: 
        !            67:        if ((f = fopen(pidfile_path, "w")) == NULL) {
        !            68:                save_errno = errno;
        !            69:                free(pidfile_path);
        !            70:                pidfile_path = NULL;
        !            71:                errno = save_errno;
        !            72:                return (-1);
        !            73:        }
        !            74: 
        !            75:        pid = getpid();
        !            76:        if (fprintf(f, "%ld\n", (long)pid) <= 0 || fclose(f) != 0) {
        !            77:                save_errno = errno;
        !            78:                (void) unlink(pidfile_path);
        !            79:                free(pidfile_path);
        !            80:                pidfile_path = NULL;
        !            81:                errno = save_errno;
        !            82:                return (-1);
        !            83:        }
        !            84: 
        !            85:        pidfile_pid = pid;
        !            86:        if (atexit(pidfile_cleanup) < 0) {
        !            87:                save_errno = errno;
        !            88:                (void) unlink(pidfile_path);
        !            89:                free(pidfile_path);
        !            90:                pidfile_path = NULL;
        !            91:                pidfile_pid = 0;
        !            92:                errno = save_errno;
        !            93:                return (-1);
        !            94:        }
        !            95: 
        !            96:        return (0);
        !            97: }
        !            98: 
        !            99: static void
        !           100: pidfile_cleanup(void)
        !           101: {
        !           102: 
        !           103:        if (pidfile_path != NULL && pidfile_pid == getpid())
        !           104:                (void) unlink(pidfile_path);
        !           105: }