| 1 | /* Open a stdio stream on an anonymous temporary file. Generic/POSIX version. |
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| 2 | Copyright (C) 1991-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <fcntl.h> |
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| 20 | #include <stdio.h> |
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| 21 | #include <unistd.h> |
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| 22 | |
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| 23 | #include <iolibio.h> |
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| 24 | #define __fdopen _IO_fdopen |
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| 25 | #ifndef tmpfile |
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| 26 | # define tmpfile __new_tmpfile |
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| 27 | #endif |
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| 28 | |
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| 29 | |
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| 30 | /* This returns a new stream opened on a temporary file (generated |
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| 31 | by tmpnam). The file is opened with mode "w+b" (binary read/write). |
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| 32 | If we couldn't generate a unique filename or the file couldn't |
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| 33 | be opened, NULL is returned. */ |
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| 34 | FILE * |
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| 35 | tmpfile (void) |
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| 36 | { |
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| 37 | int fd; |
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| 38 | FILE *f; |
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| 39 | int flags = 0; |
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| 40 | #ifdef FLAGS |
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| 41 | flags = FLAGS; |
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| 42 | #endif |
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| 43 | |
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| 44 | /* First try a system specific method. */ |
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| 45 | fd = __gen_tempfd (flags); |
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| 46 | |
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| 47 | if (fd < 0) |
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| 48 | { |
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| 49 | char buf[FILENAME_MAX]; |
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| 50 | |
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| 51 | if (__path_search (tmpl: buf, tmpl_len: sizeof buf, NULL, pfx: "tmpf" , try_tempdir: 0)) |
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| 52 | return NULL; |
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| 53 | |
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| 54 | fd = __gen_tempname (tmpl: buf, suffixlen: 0, flags: flags, __GT_FILE); |
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| 55 | if (fd < 0) |
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| 56 | return NULL; |
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| 57 | |
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| 58 | /* Note that this relies on the Unix semantics that |
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| 59 | a file is not really removed until it is closed. */ |
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| 60 | (void) __unlink (name: buf); |
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| 61 | } |
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| 62 | |
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| 63 | if ((f = __fdopen (fd, "w+b" )) == NULL) |
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| 64 | __close (fd); |
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| 65 | |
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| 66 | return f; |
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| 67 | } |
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| 68 | |
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| 69 | #if !defined O_LARGEFILE || O_LARGEFILE == 0 |
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| 70 | weak_alias (__new_tmpfile, tmpfile64) |
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| 71 | #endif |
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| 72 | |
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| 73 | #ifndef FLAGS /* Not for tmpfile64. */ |
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| 74 | # undef tmpfile |
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| 75 | # include <shlib-compat.h> |
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| 76 | versioned_symbol (libc, __new_tmpfile, tmpfile, GLIBC_2_1); |
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| 77 | #endif |
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| 78 | |
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