2 * tmpfile.c - functions to create and safely open temp files for the shell.
5 /* Copyright (C) 2000 Free Software Foundation, Inc.
7 This file is part of GNU Bash, the Bourne Again SHell.
9 Bash is free software; you can redistribute it and/or modify it
10 under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2, or (at your option)
14 Bash is distributed in the hope that it will be useful, but WITHOUT
15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
17 License for more details.
19 You should have received a copy of the GNU General Public License
20 along with Bash; see the file COPYING. If not, write to the Free
21 Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
25 #include <bashtypes.h>
26 #include <posixstat.h>
29 #if defined (HAVE_UNISTD_H)
42 #define BASEOPENFLAGS (O_CREAT | O_TRUNC | O_EXCL)
44 #define DEFAULT_TMPDIR "." /* bogus default, should be changed */
45 #define DEFAULT_NAMEROOT "shtmp"
47 extern int dollar_dollar_pid;
49 static char *sys_tmpdir = (char *)NULL;
51 static int tmpnamelen = -1;
52 static unsigned long filenum = 1L;
63 if (stat (sys_tmpdir, &sb) == 0)
66 sys_tmpdir = "/var/tmp";
67 if (stat (sys_tmpdir, &sb) == 0)
70 sys_tmpdir = "/usr/tmp";
71 if (stat (sys_tmpdir, &sb) == 0)
75 sys_tmpdir = P_tmpdir;
77 sys_tmpdir = DEFAULT_TMPDIR;
89 tdir = (flags & MT_USETMPDIR) ? get_string_value ("TMPDIR") : (char *)NULL;
91 tdir = get_sys_tmpdir ();
93 #if defined (HAVE_PATHCONF) && defined (_PC_NAME_MAX)
95 tmpnamelen = pathconf (tdir, _PC_NAME_MAX);
104 sh_mktmpname (nameroot, flags)
108 char *filename, *tdir;
112 filename = xmalloc (PATH_MAX + 1);
113 tdir = get_tmpdir (flags);
114 tdlen = strlen (tdir);
117 nameroot = DEFAULT_NAMEROOT;
121 filenum *= (int)time ((time_t *)0) * dollar_dollar_pid *
122 ((flags & MT_USERANDOM) ? get_random_number () : ntmpfiles++);
123 sprintf (filename, "%s/%s-%lu", tdir, nameroot, filenum);
124 if (tmpnamelen > 0 && tmpnamelen < 32)
125 filename[tdlen + 1 + tmpnamelen] = '\0';
127 r = lstat (filename, &sb);
129 r = stat (filename, &sb);
131 if (r < 0 && errno == ENOENT)
139 sh_mktmpfd (nameroot, flags, namep)
144 char *filename, *tdir;
147 filename = xmalloc (PATH_MAX + 1);
148 tdir = get_tmpdir (flags);
149 tdlen = strlen (tdir);
152 nameroot = DEFAULT_NAMEROOT;
156 filenum *= (int)time ((time_t *)0) * dollar_dollar_pid *
157 ((flags & MT_USERANDOM) ? get_random_number () : ntmpfiles++);
158 sprintf (filename, "%s/%s-%lu", tdir, nameroot, filenum);
159 if (tmpnamelen > 0 && tmpnamelen < 32)
160 filename[tdlen + 1 + tmpnamelen] = '\0';
161 fd = open (filename, BASEOPENFLAGS | ((flags & MT_READWRITE) ? O_RDWR : O_WRONLY), 0600);
163 while (fd < 0 && errno == EEXIST);
174 sh_mktmpfp (nameroot, flags, namep)
181 fd = sh_mktmpfd (nameroot, flags, namep);
182 return ((fd >= 0) ? (fdopen (fd, (flags & MT_READWRITE) ? "w+" : "w")) : (FILE *)NULL);