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
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation, either version 3 of the License, or
12 (at your option) any later version.
14 Bash is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with Bash. If not, see <http://www.gnu.org/licenses/>.
25 #include <bashtypes.h>
26 #include <posixstat.h>
27 #include <posixtime.h>
30 #if defined (HAVE_UNISTD_H)
43 #define BASEOPENFLAGS (O_CREAT | O_TRUNC | O_EXCL)
45 #define DEFAULT_TMPDIR "." /* bogus default, should be changed */
46 #define DEFAULT_NAMEROOT "shtmp"
48 extern pid_t dollar_dollar_pid;
50 static char *get_sys_tmpdir __P((void));
51 static char *get_tmpdir __P((int));
53 static char *sys_tmpdir = (char *)NULL;
55 static int tmpnamelen = -1;
56 static unsigned long filenum = 1L;
65 sys_tmpdir = P_tmpdir;
66 if (file_iswdir (sys_tmpdir))
71 if (file_iswdir (sys_tmpdir))
74 sys_tmpdir = "/var/tmp";
75 if (file_iswdir (sys_tmpdir))
78 sys_tmpdir = "/usr/tmp";
79 if (file_iswdir (sys_tmpdir))
82 sys_tmpdir = DEFAULT_TMPDIR;
93 tdir = (flags & MT_USETMPDIR) ? get_string_value ("TMPDIR") : (char *)NULL;
94 if (tdir && (file_iswdir (tdir) == 0 || strlen (tdir) > PATH_MAX))
98 tdir = get_sys_tmpdir ();
100 #if defined (HAVE_PATHCONF) && defined (_PC_NAME_MAX)
101 if (tmpnamelen == -1)
102 tmpnamelen = pathconf (tdir, _PC_NAME_MAX);
111 sh_mktmpname (nameroot, flags)
115 char *filename, *tdir, *lroot;
119 filename = (char *)xmalloc (PATH_MAX + 1);
120 tdir = get_tmpdir (flags);
121 tdlen = strlen (tdir);
123 lroot = nameroot ? nameroot : DEFAULT_NAMEROOT;
126 sprintf (filename, "%s/%s.XXXXXX", tdir, lroot);
127 if (mktemp (filename) == 0)
132 #else /* !USE_MKTEMP */
135 filenum = (filenum << 1) ^
136 (unsigned long) time ((time_t *)0) ^
137 (unsigned long) dollar_dollar_pid ^
138 (unsigned long) ((flags & MT_USERANDOM) ? get_random_number () : ntmpfiles++);
139 sprintf (filename, "%s/%s-%lu", tdir, lroot, filenum);
140 if (tmpnamelen > 0 && tmpnamelen < 32)
141 filename[tdlen + 1 + tmpnamelen] = '\0';
143 r = lstat (filename, &sb);
145 r = stat (filename, &sb);
147 if (r < 0 && errno == ENOENT)
150 #endif /* !USE_MKTEMP */
156 sh_mktmpfd (nameroot, flags, namep)
161 char *filename, *tdir, *lroot;
164 filename = (char *)xmalloc (PATH_MAX + 1);
165 tdir = get_tmpdir (flags);
166 tdlen = strlen (tdir);
168 lroot = nameroot ? nameroot : DEFAULT_NAMEROOT;
171 sprintf (filename, "%s/%s.XXXXXX", tdir, lroot);
172 fd = mkstemp (filename);
173 if (fd < 0 || namep == 0)
181 #else /* !USE_MKSTEMP */
184 filenum = (filenum << 1) ^
185 (unsigned long) time ((time_t *)0) ^
186 (unsigned long) dollar_dollar_pid ^
187 (unsigned long) ((flags & MT_USERANDOM) ? get_random_number () : ntmpfiles++);
188 sprintf (filename, "%s/%s-%lu", tdir, lroot, filenum);
189 if (tmpnamelen > 0 && tmpnamelen < 32)
190 filename[tdlen + 1 + tmpnamelen] = '\0';
191 fd = open (filename, BASEOPENFLAGS | ((flags & MT_READWRITE) ? O_RDWR : O_WRONLY), 0600);
193 while (fd < 0 && errno == EEXIST);
201 #endif /* !USE_MKSTEMP */
205 sh_mktmpfp (nameroot, flags, namep)
213 fd = sh_mktmpfd (nameroot, flags, namep);
215 return ((FILE *)NULL);
216 fp = fdopen (fd, (flags & MT_READWRITE) ? "w+" : "w");