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Member "tin-2.6.2/src/tmpfile.c" (9 Dec 2022, 3406 Bytes) of package /linux/misc/tin-2.6.2.tar.xz:

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    1 /*
    2  * Copyright (c) 1990, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * Chris Torek.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 #if 0
   34 #   if defined(LIBC_SCCS) && !defined(lint)
   35 static char rcsid[] = "$OpenBSD: tmpfile.c,v 1.6 1998/09/18 22:06:49 deraadt Exp $";
   36 #   endif /* LIBC_SCCS and not lint */
   37 #   include <sys/types.h>
   38 #   include <sys/stat.h>
   39 #   include <unistd.h>
   40 #   include <signal.h>
   41 #   include <errno.h>
   42 #   include <stdio.h>
   43 #   include <string.h>
   44 #   include <paths.h>
   45 #else
   46 #   include "tin.h"
   47 #endif /* 0 */
   48 
   49 #ifndef HAVE_TMPFILE
   50 #   define TRAILER "tmp.XXXXXXXXXX"
   51 
   52 FILE *
   53 tmpfile(
   54     void)
   55 {
   56     FILE *fp;
   57     char buf[sizeof(_PATH_TMP) + sizeof(TRAILER)];
   58     int sverrno, fd = -1;
   59     sigset_t set, oset;
   60 #   if !defined(HAVE_MKSTEMP) && defined(HAVE_MKTEMP)
   61     char *p;
   62 #   endif /* !HAVE_MKSTEMP && HAVE_MKTEMP */
   63 
   64     (void) memcpy(buf, _PATH_TMP, sizeof(_PATH_TMP) - 1);
   65     (void) memcpy(buf + sizeof(_PATH_TMP) - 1, TRAILER, sizeof(TRAILER));
   66 
   67     /* TODO: use portable signal blocking/unblocking */
   68     sigfillset(&set);
   69     (void) sigprocmask(SIG_BLOCK, &set, &oset);
   70 
   71 #   ifdef HAVE_MKSTEMP
   72     fd = mkstemp(buf);
   73 #   else
   74 #       ifdef HAVE_MKTEMP
   75     p = mktemp(buf);
   76     fd = open(p, (O_WRONLY|O_CREAT|O_EXCL), (mode_t) (S_IRUSR|S_IWUSR));
   77 #       endif /* HAVE_MKTEMP */
   78 #   endif /* HAVE_MKSTEMP */
   79 
   80     if (fd != -1) {
   81         mode_t u;
   82 
   83         (void) unlink(buf);
   84         u = umask(0);
   85         (void) umask(u);
   86 #   ifdef HAVE_FCHMOD
   87         (void) fchmod(fd, (S_IRUGO|S_IWUGO) & ~u);
   88 #   else
   89 #       if defined(HAVE_CHMOD) && !defined(HAVE_MKSTEMP) && defined(HAVE_MKTEMP)
   90         fchmod(p, (S_IRUGO|S_IWUGO) & ~u);
   91 #       endif /* HAVE_CHMOD && !HAVE_MKSTEMP && HAVE_MKTEMP */
   92 #   endif /* HAVE_FCHMOD */
   93     }
   94 
   95     (void) sigprocmask(SIG_SETMASK, &oset, NULL);
   96 
   97     if (fd == -1)
   98         return NULL;
   99 
  100     if ((fp = fdopen(fd, "w+")) == NULL) {
  101         sverrno = errno;
  102         (void) close(fd);
  103         errno = sverrno;
  104         return NULL;
  105     }
  106     return fp;
  107 }
  108 #endif /* !HAVE_TMPFILE */