Contents of /tags/mkinitrd-6_1_3/busybox/libbb/make_directory.c
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Mon May 4 18:51:23 2009 UTC (15 years, 4 months ago) by niro
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Mon May 4 18:51:23 2009 UTC (15 years, 4 months ago) by niro
File MIME type: text/plain
File size: 2522 byte(s)
tagged 'mkinitrd-6_1_3'
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * parse_mode implementation for busybox |
4 | * |
5 | * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org> |
6 | * |
7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
8 | */ |
9 | |
10 | /* Mar 5, 2003 Manuel Novoa III |
11 | * |
12 | * This is the main work function for the 'mkdir' applet. As such, it |
13 | * strives to be SUSv3 compliant in it's behaviour when recursively |
14 | * making missing parent dirs, and in it's mode setting of the final |
15 | * directory 'path'. |
16 | * |
17 | * To recursively build all missing intermediate directories, make |
18 | * sure that (flags & FILEUTILS_RECUR) is non-zero. Newly created |
19 | * intermediate directories will have at least u+wx perms. |
20 | * |
21 | * To set specific permissions on 'path', pass the appropriate 'mode' |
22 | * val. Otherwise, pass -1 to get default permissions. |
23 | */ |
24 | |
25 | #include "libbb.h" |
26 | |
27 | /* This function is used from NOFORK applets. It must not allocate anything */ |
28 | |
29 | int FAST_FUNC bb_make_directory(char *path, long mode, int flags) |
30 | { |
31 | mode_t mask; |
32 | const char *fail_msg; |
33 | char *s = path; |
34 | char c; |
35 | struct stat st; |
36 | |
37 | mask = umask(0); |
38 | umask(mask & ~0300); /* Ensure intermediate dirs are wx */ |
39 | |
40 | while (1) { |
41 | c = '\0'; |
42 | |
43 | if (flags & FILEUTILS_RECUR) { /* Get the parent. */ |
44 | /* Bypass leading non-'/'s and then subsequent '/'s. */ |
45 | while (*s) { |
46 | if (*s == '/') { |
47 | do { |
48 | ++s; |
49 | } while (*s == '/'); |
50 | c = *s; /* Save the current char */ |
51 | *s = '\0'; /* and replace it with nul. */ |
52 | break; |
53 | } |
54 | ++s; |
55 | } |
56 | } |
57 | |
58 | if (!c) /* Last component uses orig umask */ |
59 | umask(mask); |
60 | |
61 | if (mkdir(path, 0777) < 0) { |
62 | /* If we failed for any other reason than the directory |
63 | * already exists, output a diagnostic and return -1. */ |
64 | if (errno != EEXIST |
65 | || !(flags & FILEUTILS_RECUR) |
66 | || ((stat(path, &st) < 0) || !S_ISDIR(st.st_mode)) |
67 | ) { |
68 | fail_msg = "create"; |
69 | umask(mask); |
70 | break; |
71 | } |
72 | /* Since the directory exists, don't attempt to change |
73 | * permissions if it was the full target. Note that |
74 | * this is not an error condition. */ |
75 | if (!c) { |
76 | umask(mask); |
77 | return 0; |
78 | } |
79 | } |
80 | |
81 | if (!c) { |
82 | /* Done. If necessary, update perms on the newly |
83 | * created directory. Failure to update here _is_ |
84 | * an error. */ |
85 | if ((mode != -1) && (chmod(path, mode) < 0)) { |
86 | fail_msg = "set permissions of"; |
87 | break; |
88 | } |
89 | return 0; |
90 | } |
91 | |
92 | /* Remove any inserted nul from the path (recursive mode). */ |
93 | *s = c; |
94 | } /* while (1) */ |
95 | |
96 | bb_perror_msg("cannot %s directory '%s'", fail_msg, path); |
97 | return -1; |
98 | } |