mirror of
https://git.savannah.gnu.org/git/bison.git
synced 2026-03-21 18:23:03 +00:00
Do not create a temporary file, as that involves security and
cleanup headaches. Instead, use a pair of pipes. Derived from a suggestion by Florian Krohm.
This commit is contained in:
Paul Eggert
@@ -1,42 +0,0 @@
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/* Copyright (C) 1998, 1999, 2001 Free Software Foundation, Inc.
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This file is derived from the one in the GNU C Library.
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|
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This program is free software; you can redistribute it and/or modify
|
|
||||||
it under the terms of the GNU General Public License as published by
|
|
||||||
the Free Software Foundation; either version 2, or (at your option)
|
|
||||||
any later version.
|
|
||||||
|
|
||||||
This program is distributed in the hope that it will be useful,
|
|
||||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
||||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
||||||
GNU General Public License for more details.
|
|
||||||
|
|
||||||
You should have received a copy of the GNU General Public License
|
|
||||||
along with this program; if not, write to the Free Software Foundation,
|
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||||||
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include <config.h>
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/* Disable the definition of mkstemp to rpl_mkstemp (from config.h) in this
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file. Otherwise, we'd get conflicting prototypes for rpl_mkstemp on
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most systems. */
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#undef mkstemp
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#include <stdio.h>
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#include <stdlib.h>
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#ifndef __GT_FILE
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# define __GT_FILE 0
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#endif
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int __gen_tempname ();
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/* Generate a unique temporary file name from TEMPLATE.
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The last six characters of TEMPLATE must be "XXXXXX";
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they are replaced with a string that makes the filename unique.
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Then open the file and return a fd. */
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int
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rpl_mkstemp (char *template)
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{
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return __gen_tempname (template, __GT_FILE);
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}
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@@ -1,96 +0,0 @@
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/* Open a pipe to read from a program without intermediary sh.
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Copyright (C) 1992, 1997 Free Software Foundation, Inc.
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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, or (at your option)
|
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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
|
|
||||||
GNU General Public License for more details.
|
|
||||||
|
|
||||||
You should have received a copy of the GNU General Public License
|
|
||||||
along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* Written by David MacKenzie. */
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdio.h>
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#if __STDC__
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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#if HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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/* Open a pipe to read from a program without intermediary sh. Checks
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PATH. Sample use:
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stream = readpipe ("progname", "arg1", "arg2", (char *) 0);
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Return 0 on error. */
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#if __STDC__
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FILE *
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readpipe (char *progname, ...)
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#else
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FILE *
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readpipe (va_alist)
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#endif
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{
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#if ! __STDC__
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char *progname;
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#endif
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int fds[2];
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va_list ap;
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char *args[100];
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int argno = 0;
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/* Copy arguments into `args'. */
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#if __STDC__
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va_start (ap, progname);
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#else
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va_start (ap);
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progname = va_arg (ap, char *);
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#endif
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args[argno++] = progname;
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while ((args[argno++] = va_arg (ap, char *)) != NULL)
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;
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va_end (ap);
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if (pipe (fds) == -1)
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return 0;
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switch (fork ())
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{
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case 0: /* Child. Write to pipe. */
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close (fds[0]); /* Not needed. */
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if (fds[1] != 1) /* Redirect 1 (stdout) only if needed. */
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{
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close (1); /* We don't want the old stdout. */
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if (dup (fds[1]) == 0)/* Maybe stdin was closed. */
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{
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dup (fds[1]); /* Guaranteed to dup to 1 (stdout). */
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close (0);
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}
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close (fds[1]); /* No longer needed. */
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}
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execvp (args[0], args);
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_exit (2); /* 2 for `cmp'. */
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case -1: /* Error. */
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return 0;
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default: /* Parent. Read from pipe. */
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close (fds[1]); /* Not needed. */
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return fdopen (fds[0], "r");
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}
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}
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342
lib/tempname.c
342
lib/tempname.c
@@ -1,342 +0,0 @@
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/* Copyright (C) 1991-1999, 2000, 2001 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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|
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This program is free software; you can redistribute it and/or modify
|
|
||||||
it under the terms of the GNU General Public License as published by
|
|
||||||
the Free Software Foundation; either version 2, or (at your option)
|
|
||||||
any later version.
|
|
||||||
|
|
||||||
This program is distributed in the hope that it will be useful,
|
|
||||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
||||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
||||||
GNU General Public License for more details.
|
|
||||||
|
|
||||||
You should have received a copy of the GNU General Public License
|
|
||||||
along with this program; if not, write to the Free Software Foundation,
|
|
||||||
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <sys/types.h>
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#include <assert.h>
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#include <errno.h>
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#ifndef __set_errno
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# define __set_errno(Val) errno = (Val)
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#endif
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#include <stdio.h>
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#ifndef P_tmpdir
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# define P_tmpdir "/tmp"
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#endif
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#ifndef TMP_MAX
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# define TMP_MAX 238328
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#endif
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#ifndef __GT_FILE
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# define __GT_FILE 0
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# define __GT_BIGFILE 1
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# define __GT_DIR 2
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# define __GT_NOCREATE 3
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#endif
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#if STDC_HEADERS || _LIBC
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# include <stddef.h>
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# include <string.h>
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#endif
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#include <stdlib.h>
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#if HAVE_FCNTL_H || _LIBC
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# include <fcntl.h>
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#endif
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#if HAVE_SYS_TIME_H || _LIBC
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# include <sys/time.h>
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#endif
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#if HAVE_STDINT_H || _LIBC
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# include <stdint.h>
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#endif
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#if HAVE_UNISTD_H || _LIBC
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# include <unistd.h>
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#endif
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#include <sys/stat.h>
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#if STAT_MACROS_BROKEN
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# undef S_ISDIR
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#endif
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#if !defined S_ISDIR && defined S_IFDIR
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# define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
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#endif
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#if !S_IRUSR && S_IREAD
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# define S_IRUSR S_IREAD
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#endif
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#if !S_IRUSR
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# define S_IRUSR 00400
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#endif
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#if !S_IWUSR && S_IWRITE
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# define S_IWUSR S_IWRITE
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#endif
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#if !S_IWUSR
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# define S_IWUSR 00200
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#endif
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#if !S_IXUSR && S_IEXEC
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# define S_IXUSR S_IEXEC
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#endif
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#if !S_IXUSR
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# define S_IXUSR 00100
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#endif
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#if _LIBC
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# define struct_stat64 struct stat64
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#else
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# define struct_stat64 struct stat
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# define __getpid getpid
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# define __gettimeofday gettimeofday
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# define __mkdir mkdir
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# define __open open
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# define __open64 open
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# define __lxstat64(version, path, buf) lstat (path, buf)
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# define __xstat64(version, path, buf) stat (path, buf)
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#endif
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|
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#if ! (HAVE___SECURE_GETENV || _LIBC)
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# define __secure_getenv getenv
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#endif
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#ifdef _LIBC
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# include <hp-timing.h>
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# if HP_TIMING_AVAIL
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# define RANDOM_BITS(Var) \
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if (__builtin_expect (value == UINT64_C (0), 0)) \
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{ \
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/* If this is the first time this function is used initialize \
|
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the variable we accumulate the value in to some somewhat \
|
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random value. If we'd not do this programs at startup time \
|
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||||||
might have a reduced set of possible names, at least on slow \
|
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||||||
machines. */ \
|
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||||||
struct timeval tv; \
|
|
||||||
__gettimeofday (&tv, NULL); \
|
|
||||||
value = ((uint64_t) tv.tv_usec << 16) ^ tv.tv_sec; \
|
|
||||||
} \
|
|
||||||
HP_TIMING_NOW (Var)
|
|
||||||
# endif
|
|
||||||
#endif
|
|
||||||
|
|
||||||
/* Use the widest available unsigned type if uint64_t is not
|
|
||||||
available. The algorithm below extracts a number less than 62**6
|
|
||||||
(approximately 2**35.725) from uint64_t, so ancient hosts where
|
|
||||||
uintmax_t is only 32 bits lose about 3.725 bits of randomness,
|
|
||||||
which is better than not having mkstemp at all. */
|
|
||||||
#if !defined UINT64_MAX && !defined uint64_t
|
|
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# define uint64_t uintmax_t
|
|
||||||
#endif
|
|
||||||
|
|
||||||
/* Return nonzero if DIR is an existent directory. */
|
|
||||||
static int
|
|
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direxists (const char *dir)
|
|
||||||
{
|
|
||||||
struct_stat64 buf;
|
|
||||||
return __xstat64 (_STAT_VER, dir, &buf) == 0 && S_ISDIR (buf.st_mode);
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Path search algorithm, for tmpnam, tmpfile, etc. If DIR is
|
|
||||||
non-null and exists, uses it; otherwise uses the first of $TMPDIR,
|
|
||||||
P_tmpdir, /tmp that exists. Copies into TMPL a template suitable
|
|
||||||
for use with mk[s]temp. Will fail (-1) if DIR is non-null and
|
|
||||||
doesn't exist, none of the searched dirs exists, or there's not
|
|
||||||
enough space in TMPL. */
|
|
||||||
int
|
|
||||||
__path_search (char *tmpl, size_t tmpl_len, const char *dir, const char *pfx,
|
|
||||||
int try_tmpdir)
|
|
||||||
{
|
|
||||||
const char *d;
|
|
||||||
size_t dlen, plen;
|
|
||||||
|
|
||||||
if (!pfx || !pfx[0])
|
|
||||||
{
|
|
||||||
pfx = "file";
|
|
||||||
plen = 4;
|
|
||||||
}
|
|
||||||
else
|
|
||||||
{
|
|
||||||
plen = strlen (pfx);
|
|
||||||
if (plen > 5)
|
|
||||||
plen = 5;
|
|
||||||
}
|
|
||||||
|
|
||||||
if (try_tmpdir)
|
|
||||||
{
|
|
||||||
d = __secure_getenv ("TMPDIR");
|
|
||||||
if (d != NULL && direxists (d))
|
|
||||||
dir = d;
|
|
||||||
else if (dir != NULL && direxists (dir))
|
|
||||||
/* nothing */ ;
|
|
||||||
else
|
|
||||||
dir = NULL;
|
|
||||||
}
|
|
||||||
if (dir == NULL)
|
|
||||||
{
|
|
||||||
if (direxists (P_tmpdir))
|
|
||||||
dir = P_tmpdir;
|
|
||||||
else if (strcmp (P_tmpdir, "/tmp") != 0 && direxists ("/tmp"))
|
|
||||||
dir = "/tmp";
|
|
||||||
else
|
|
||||||
{
|
|
||||||
__set_errno (ENOENT);
|
|
||||||
return -1;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
dlen = strlen (dir);
|
|
||||||
while (dlen > 1 && dir[dlen - 1] == '/')
|
|
||||||
dlen--; /* remove trailing slashes */
|
|
||||||
|
|
||||||
/* check we have room for "${dir}/${pfx}XXXXXX\0" */
|
|
||||||
if (tmpl_len < dlen + 1 + plen + 6 + 1)
|
|
||||||
{
|
|
||||||
__set_errno (EINVAL);
|
|
||||||
return -1;
|
|
||||||
}
|
|
||||||
|
|
||||||
sprintf (tmpl, "%.*s/%.*sXXXXXX", (int) dlen, dir, (int) plen, pfx);
|
|
||||||
return 0;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* These are the characters used in temporary filenames. */
|
|
||||||
static const char letters[] =
|
|
||||||
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
|
|
||||||
|
|
||||||
/* Generate a temporary file name based on TMPL. TMPL must match the
|
|
||||||
rules for mk[s]temp (i.e. end in "XXXXXX"). The name constructed
|
|
||||||
does not exist at the time of the call to __gen_tempname. TMPL is
|
|
||||||
overwritten with the result.
|
|
||||||
|
|
||||||
KIND may be one of:
|
|
||||||
__GT_NOCREATE: simply verify that the name does not exist
|
|
||||||
at the time of the call.
|
|
||||||
__GT_FILE: create the file using open(O_CREAT|O_EXCL)
|
|
||||||
and return a read-write fd. The file is mode 0600.
|
|
||||||
__GT_BIGFILE: same as __GT_FILE but use open64().
|
|
||||||
__GT_DIR: create a directory, which will be mode 0700.
|
|
||||||
|
|
||||||
We use a clever algorithm to get hard-to-predict names. */
|
|
||||||
int
|
|
||||||
__gen_tempname (char *tmpl, int kind)
|
|
||||||
{
|
|
||||||
int len;
|
|
||||||
char *XXXXXX;
|
|
||||||
static uint64_t value;
|
|
||||||
uint64_t random_time_bits;
|
|
||||||
unsigned int count;
|
|
||||||
int fd = -1;
|
|
||||||
int save_errno = errno;
|
|
||||||
struct_stat64 st;
|
|
||||||
|
|
||||||
/* A lower bound on the number of temporary files to attempt to
|
|
||||||
generate. The maximum total number of temporary file names that
|
|
||||||
can exist for a given template is 62**6. It should never be
|
|
||||||
necessary to try all these combinations. Instead if a reasonable
|
|
||||||
number of names is tried (we define reasonable as 62**3) fail to
|
|
||||||
give the system administrator the chance to remove the problems. */
|
|
||||||
unsigned int attempts_min = 62 * 62 * 62;
|
|
||||||
|
|
||||||
/* The number of times to attempt to generate a temporary file. To
|
|
||||||
conform to POSIX, this must be no smaller than TMP_MAX. */
|
|
||||||
unsigned int attempts = attempts_min < TMP_MAX ? TMP_MAX : attempts_min;
|
|
||||||
|
|
||||||
len = strlen (tmpl);
|
|
||||||
if (len < 6 || strcmp (&tmpl[len - 6], "XXXXXX"))
|
|
||||||
{
|
|
||||||
__set_errno (EINVAL);
|
|
||||||
return -1;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* This is where the Xs start. */
|
|
||||||
XXXXXX = &tmpl[len - 6];
|
|
||||||
|
|
||||||
/* Get some more or less random data. */
|
|
||||||
#ifdef RANDOM_BITS
|
|
||||||
RANDOM_BITS (random_time_bits);
|
|
||||||
#else
|
|
||||||
# if HAVE_GETTIMEOFDAY || _LIBC
|
|
||||||
{
|
|
||||||
struct timeval tv;
|
|
||||||
__gettimeofday (&tv, NULL);
|
|
||||||
random_time_bits = ((uint64_t) tv.tv_usec << 16) ^ tv.tv_sec;
|
|
||||||
}
|
|
||||||
# else
|
|
||||||
random_time_bits = time (NULL);
|
|
||||||
# endif
|
|
||||||
#endif
|
|
||||||
value += random_time_bits ^ __getpid ();
|
|
||||||
|
|
||||||
for (count = 0; count < attempts; value += 7777, ++count)
|
|
||||||
{
|
|
||||||
uint64_t v = value;
|
|
||||||
|
|
||||||
/* Fill in the random bits. */
|
|
||||||
XXXXXX[0] = letters[v % 62];
|
|
||||||
v /= 62;
|
|
||||||
XXXXXX[1] = letters[v % 62];
|
|
||||||
v /= 62;
|
|
||||||
XXXXXX[2] = letters[v % 62];
|
|
||||||
v /= 62;
|
|
||||||
XXXXXX[3] = letters[v % 62];
|
|
||||||
v /= 62;
|
|
||||||
XXXXXX[4] = letters[v % 62];
|
|
||||||
v /= 62;
|
|
||||||
XXXXXX[5] = letters[v % 62];
|
|
||||||
|
|
||||||
switch (kind)
|
|
||||||
{
|
|
||||||
case __GT_FILE:
|
|
||||||
fd = __open (tmpl, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
|
|
||||||
break;
|
|
||||||
|
|
||||||
case __GT_BIGFILE:
|
|
||||||
fd = __open64 (tmpl, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
|
|
||||||
break;
|
|
||||||
|
|
||||||
case __GT_DIR:
|
|
||||||
fd = __mkdir (tmpl, S_IRUSR | S_IWUSR | S_IXUSR);
|
|
||||||
break;
|
|
||||||
|
|
||||||
case __GT_NOCREATE:
|
|
||||||
/* This case is backward from the other three. __gen_tempname
|
|
||||||
succeeds if __xstat fails because the name does not exist.
|
|
||||||
Note the continue to bypass the common logic at the bottom
|
|
||||||
of the loop. */
|
|
||||||
if (__lxstat64 (_STAT_VER, tmpl, &st) < 0)
|
|
||||||
{
|
|
||||||
if (errno == ENOENT)
|
|
||||||
{
|
|
||||||
__set_errno (save_errno);
|
|
||||||
return 0;
|
|
||||||
}
|
|
||||||
else
|
|
||||||
/* Give up now. */
|
|
||||||
return -1;
|
|
||||||
}
|
|
||||||
continue;
|
|
||||||
|
|
||||||
default:
|
|
||||||
assert (! "invalid KIND in __gen_tempname");
|
|
||||||
}
|
|
||||||
|
|
||||||
if (fd >= 0)
|
|
||||||
{
|
|
||||||
__set_errno (save_errno);
|
|
||||||
return fd;
|
|
||||||
}
|
|
||||||
else if (errno != EEXIST)
|
|
||||||
return -1;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* We got out of the loop because we ran out of combinations to try. */
|
|
||||||
__set_errno (EEXIST);
|
|
||||||
return -1;
|
|
||||||
}
|
|
||||||
@@ -1,46 +0,0 @@
|
|||||||
#serial 1
|
|
||||||
|
|
||||||
# On some systems (e.g., HPUX-10.20, SunOS4.1.4, solaris2.5.1), mkstemp has the
|
|
||||||
# silly limit that it can create no more than 26 files from a given template.
|
|
||||||
# Other systems lack mkstemp altogether. On either type of system, arrange
|
|
||||||
# to use the replacement function.
|
|
||||||
AC_DEFUN([UTILS_FUNC_MKSTEMP],
|
|
||||||
[dnl
|
|
||||||
AC_REPLACE_FUNCS(mkstemp)
|
|
||||||
if test $ac_cv_func_mkstemp = no; then
|
|
||||||
utils_cv_func_mkstemp_limitations=yes
|
|
||||||
else
|
|
||||||
AC_CACHE_CHECK([for mkstemp limitations],
|
|
||||||
utils_cv_func_mkstemp_limitations,
|
|
||||||
[
|
|
||||||
AC_TRY_RUN([
|
|
||||||
# include <stdlib.h>
|
|
||||||
int main ()
|
|
||||||
{
|
|
||||||
int i;
|
|
||||||
for (i = 0; i < 30; i++)
|
|
||||||
{
|
|
||||||
char template[] = "conftestXXXXXX";
|
|
||||||
int fd = mkstemp (template);
|
|
||||||
if (fd == -1)
|
|
||||||
exit (1);
|
|
||||||
close (fd);
|
|
||||||
}
|
|
||||||
exit (0);
|
|
||||||
}
|
|
||||||
],
|
|
||||||
utils_cv_func_mkstemp_limitations=no,
|
|
||||||
utils_cv_func_mkstemp_limitations=yes,
|
|
||||||
utils_cv_func_mkstemp_limitations=yes
|
|
||||||
)
|
|
||||||
]
|
|
||||||
)
|
|
||||||
fi
|
|
||||||
|
|
||||||
if test $utils_cv_func_mkstemp_limitations = yes; then
|
|
||||||
AC_LIBOBJ(mkstemp)
|
|
||||||
AC_LIBOBJ(tempname)
|
|
||||||
AC_DEFINE(mkstemp, rpl_mkstemp,
|
|
||||||
[Define to rpl_mkstemp if the replacement function should be used.])
|
|
||||||
fi
|
|
||||||
])
|
|
||||||
Reference in New Issue
Block a user