80 lines
2.6 KiB
C
80 lines
2.6 KiB
C
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/* pidfile.c - process id file functions
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* Time-stamp: <2010-11-03 05:19:23 nk>
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*
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* (c) 2003-2010 Nicholas J. Kain <njkain at gmail dot com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <string.h>
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#include "defines.h"
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#include "log.h"
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void write_pid(const char *file) {
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FILE *f;
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size_t written, len;
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char buf[MAXLINE];
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f = fopen(file, "w");
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if (f == NULL) {
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log_line("FATAL - failed to open pid file \"%s\"!\n", file);
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exit(EXIT_FAILURE);
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}
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snprintf(buf, sizeof buf - 1, "%i", (unsigned int)getpid());
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len = strlen(buf);
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written = 0;
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while (written < len)
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written = fwrite(buf + written, sizeof (char), len - written, f);
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if (fclose(f) != 0) {
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log_line("FATAL - failed to close pid file \"%s\"!\n", file);
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exit(EXIT_FAILURE);
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}
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}
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/* Return 0 on success, -1 on failure. */
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int file_exists(const char *file, const char *mode) {
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FILE *f;
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if (file == NULL || mode == NULL) {
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log_line("file_exists: FATAL - coding bug: NULL passed\n");
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return -1;
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}
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f = fopen(file, mode);
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if (f == NULL) {
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log_line("file_exists: FATAL - can't open file %s with mode %s!\n",
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file, mode);
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return -1;
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}
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fclose(f);
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return 0;
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}
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