| 1 | /*
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| 2 | * Copyright (c) 2018 Jiri Svoboda
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup libc
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| 30 | * @{
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| 31 | */
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| 32 | /** @file Temporary files
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| 33 | */
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| 34 |
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| 35 | #include <errno.h>
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| 36 | #include <fibril_synch.h>
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| 37 | #include <stdio.h>
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| 38 | #include <str.h>
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| 39 | #include <tmpfile.h>
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| 40 | #include <vfs/vfs.h>
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| 41 |
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| 42 | static size_t tmpfile_cnt = 0;
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| 43 | static FIBRIL_MUTEX_INITIALIZE(tmpfile_lock);
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| 44 |
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| 45 | /** Create and open file suitable as temporary file based on template.
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| 46 | *
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| 47 | * This is designed to allow creating temporary files compatible with POSIX
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| 48 | * mk(s)temp and tempnam, as well as for the use of ISO C tmpfile, tmpnam.
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| 49 | *
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| 50 | * @param templ
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| 51 | * @param create If @c false, only construct file name
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| 52 | *
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| 53 | * @return If @a create is true, open file descriptor on success (and
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| 54 | * @a *templ is filled in with actual file name),
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| 55 | * if @a create is false, zero on success. -1 on failure.
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| 56 | */
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| 57 | int __tmpfile_templ(char *templ, bool create)
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| 58 | {
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| 59 | size_t tsize;
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| 60 | char *p;
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| 61 | int file;
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| 62 | errno_t rc;
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| 63 |
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| 64 | tsize = str_bytes(templ);
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| 65 | if (tsize < 6)
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| 66 | return -1;
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| 67 |
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| 68 | p = templ + tsize - 6;
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| 69 | if (str_cmp(p, "XXXXXX") != 0)
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| 70 | return -1;
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| 71 |
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| 72 | fibril_mutex_lock(&tmpfile_lock);
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| 73 |
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| 74 | while (tmpfile_cnt < 1000000) {
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| 75 | snprintf(p, 6 + 1, "%06zu", tmpfile_cnt);
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| 76 | if (create) {
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| 77 | /* Try creating file */
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| 78 | rc = vfs_lookup(templ, WALK_MUST_CREATE |
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| 79 | WALK_REGULAR, &file);
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| 80 | if (rc == EOK) {
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| 81 | rc = vfs_open(file, MODE_READ | MODE_WRITE);
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| 82 | if (rc == EOK) {
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| 83 | ++tmpfile_cnt;
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| 84 | fibril_mutex_unlock(&tmpfile_lock);
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| 85 | return file;
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| 86 | }
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| 87 |
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| 88 | vfs_put(file);
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| 89 | }
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| 90 | } else {
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| 91 | /* Test if file exists */
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| 92 | rc = vfs_lookup(templ, 0, &file);
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| 93 | if (rc != EOK) {
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| 94 | ++tmpfile_cnt;
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| 95 | fibril_mutex_unlock(&tmpfile_lock);
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| 96 | return 0;
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| 97 | }
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| 98 |
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| 99 | vfs_put(file);
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| 100 | }
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| 101 |
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| 102 | ++tmpfile_cnt;
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| 103 | }
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| 104 |
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| 105 | fibril_mutex_unlock(&tmpfile_lock);
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| 106 | return -1;
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| 107 | }
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| 108 |
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| 109 | /** Create and open temporary (unnamed) file.
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| 110 | *
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| 111 | * @return Open file descriptor on success, -1 on failure.
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| 112 | */
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| 113 | int __tmpfile(void)
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| 114 | {
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| 115 | int file;
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| 116 | char namebuf[L_tmpnam];
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| 117 |
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| 118 | str_cpy(namebuf, L_tmpnam, "/tmp/tmp.XXXXXX");
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| 119 |
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| 120 | file = __tmpfile_templ(namebuf, true);
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| 121 | if (file < 0)
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| 122 | return -1;
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| 123 |
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| 124 | (void) vfs_unlink_path(namebuf);
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| 125 | return file;
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| 126 | }
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| 127 |
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| 128 | /** Construct temporary file name.
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| 129 | *
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| 130 | * @param namebuf Buffer that can hold at least L_tmpnam bytes
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| 131 | * @return @a namebuf on success, @c NULL on failure
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| 132 | */
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| 133 | char *__tmpnam(char *namebuf)
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| 134 | {
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| 135 | int rc;
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| 136 |
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| 137 | str_cpy(namebuf, L_tmpnam, "/tmp/tmp.XXXXXX");
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| 138 |
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| 139 | rc = __tmpfile_templ(namebuf, false);
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| 140 | if (rc < 0)
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| 141 | return NULL;
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| 142 |
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| 143 | return namebuf;
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| 144 | }
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| 145 |
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| 146 | /** @}
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| 147 | */
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