81 lines
2.5 KiB
C
81 lines
2.5 KiB
C
/*
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* FCRON - periodic command scheduler
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*
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* Copyright 2000-2014 Thibault Godouet <fcron@free.fr>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* The GNU General Public License can also be found in the file
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* `LICENSE' that comes with the fcron source distribution.
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*/
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#include "global.h"
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#include "temp_file.h"
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#include "mem.h"
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extern char *tmp_path;
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extern char debug_opt;
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int
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temp_file(char **name)
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/* Open a temporary file and return its file descriptor */
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/* Returns the filename to *name if name is not null. */
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/* (die on error) */
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{
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int fd;
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#ifdef HAVE_MKSTEMP
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char name_local[PATH_LEN] = "";
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snprintf(name_local, sizeof(name_local), "%sfcr-XXXXXX", tmp_path);
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if ((fd = mkstemp(name_local)) == -1)
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die_e("Can't find a unique temporary filename");
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/* we must set the file mode to 600 (some versions of mkstemp may set it
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* incorrectly) */
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if (fchmod(fd, S_IWUSR | S_IRUSR) != 0)
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die_e("Can't fchmod temp file");
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#else
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const int max_retries = 50;
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char *name_local = NULL;
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int i;
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i = 0;
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do {
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i++;
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Set(name_local, tempnam(NULL, NULL));
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if (name_local == NULL)
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die("Can't find a unique temporary filename");
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fd = open(name_local, O_RDWR | O_CREAT | O_EXCL | O_APPEND,
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S_IRUSR | S_IWUSR);
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/* I'm not sure we actually need to be so persistent here */
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} while (fd == -1 && errno == EEXIST && i < max_retries);
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if (fd == -1)
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die_e("Can't open temporary file");
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#endif
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if (name == NULL && unlink(name_local) != 0)
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die_e("Can't unlink temporary file %s", name_local);
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fcntl(fd, F_SETFD, 1); /* set close-on-exec flag */
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/* give the name of the temp file if necessary */
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if (name != NULL)
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*name = strdup2(name_local);
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#ifndef HAVE_MKSTEMP
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free(name_local);
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#endif
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return fd;
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}
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