1 /* Open a stdio stream on an anonymous temporary file. Hurd version.
2 Copyright (C) 2001-2021 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #include <stdio.h>
20 #include <hurd.h>
21 #include <hurd/fs.h>
22 #include <hurd/fd.h>
23 #include <fcntl.h>
24 #include <unistd.h>
25 #include <iolibio.h>
26
27 /* This returns a new stream opened on a temporary file (generated
28 by tmpnam). The file is opened with mode "w+b" (binary read/write).
29 If we couldn't generate a unique filename or the file couldn't
30 be opened, NULL is returned. */
31 FILE *
__tmpfile(void)32 __tmpfile (void)
33 {
34 error_t err;
35 file_t file;
36 int fd;
37 FILE *f;
38
39 /* Get a port to the directory that will contain the file. */
40 const char *dirname = __libc_secure_getenv ("TMPDIR") ?: P_tmpdir;
41 file_t dir = __file_name_lookup (dirname, 0, 0);
42 if (dir == MACH_PORT_NULL)
43 return NULL;
44
45 /* Create an unnamed file in the temporary directory. */
46 err = __dir_mkfile (dir, O_RDWR, S_IRUSR | S_IWUSR, &file);
47 __mach_port_deallocate (__mach_task_self (), dir);
48 if (err)
49 return __hurd_fail (err), NULL;
50
51 /* Get a file descriptor for that port. POSIX.1 requires that streams
52 returned by tmpfile allocate file descriptors as fopen would. */
53 fd = _hurd_intern_fd (file, O_RDWR, 1); /* dealloc on error */
54 if (fd < 0)
55 return NULL;
56
57 /* Open a stream on the unnamed file.
58 It will cease to exist when this stream is closed. */
59 if ((f = _IO_fdopen (fd, "w+b")) == NULL)
60 __close (fd);
61
62 return f;
63 }
64
65 #include <shlib-compat.h>
66 versioned_symbol (libc, __tmpfile, tmpfile, GLIBC_2_1);
67
68 weak_alias (__tmpfile, tmpfile64)
69