1mkdir(2) System Calls mkdir(2)
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6 mkdir - make a directory
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9 #include <sys/types.h>
10 #include <sys/stat.h>
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12 int mkdir(const char *path, mode_t mode);
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16 The mkdir() function creates a new directory named by the path name
17 pointed to by path. The mode of the new directory is initialized from
18 mode (see chmod(2) for values of mode). The protection part of the mode
19 argument is modified by the process's file creation mask (see
20 umask(2)).
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23 The directory's owner ID is set to the process's effective user ID.
24 The directory's group ID is set to the process's effective group ID,
25 or if the S_ISGID bit is set in the parent directory, then the group ID
26 of the directory is inherited from the parent. The S_ISGID bit of the
27 new directory is inherited from the parent directory.
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30 If path names a symbolic link, mkdir() fails and sets errno to EEXIST.
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33 The newly created directory is empty with the exception of entries for
34 itself (.) and its parent directory (..).
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37 Upon successful completion, mkdir() marks for update the st_atime,
38 st_ctime and st_mtime fields of the directory. Also, the st_ctime and
39 st_mtime fields of the directory that contains the new entry are marked
40 for update.
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43 Upon successful completion, 0 is returned. Otherwise, −1 is returned,
44 no directory is created, and errno is set to indicate the error.
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47 The mkdir() function will fail if:
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49 EACCES Either a component of the path prefix denies search
50 permission or write permission is denied on the parent
51 directory of the directory to be created.
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54 EDQUOT The directory where the new file entry is being placed
55 cannot be extended because the user's quota of disk
56 blocks on that file system has been exhausted; the new
57 directory cannot be created because the user's quota of
58 disk blocks on that file system has been exhausted; or
59 the user's quota of inodes on the file system where the
60 file is being created has been exhausted.
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63 EEXIST The named file already exists.
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66 EFAULT The path argument points to an illegal address.
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69 EINVAL An attempt was made to create an extended attribute
70 that is a directory.
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73 EIO An I/O error has occurred while accessing the file sys‐
74 tem.
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77 EILSEQ The path argument includes non-UTF8 characters and the
78 file system accepts only file names where all charac‐
79 ters are part of the UTF-8 character codeset.
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82 ELOOP Too many symbolic links were encountered in translating
83 path, or a loop exists in symbolic links encountered
84 during resolution of path
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87 EMLINK The maximum number of links to the parent directory
88 would be exceeded.
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91 ENAMETOOLONG The length of the path argument exceeds PATH_MAX, or
92 the length of a path component exceeds NAME_MAX while
93 _POSIX_NO_TRUNC is in effect.
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96 ENOENT A component of the path prefix does not exist or is a
97 null pathname.
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100 ENOLINK The path argument points to a remote machine and the
101 link to that machine is no longer active.
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104 ENOSPC No free space is available on the device containing the
105 directory.
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108 ENOTDIR A component of the path prefix is not a directory.
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111 EROFS The path prefix resides on a read-only file system.
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115 The mkdir() function may fail if:
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117 ENAMETOOLONG As a result of encountering a symbolic link in resolu‐
118 tion of the path argument, the length of the substi‐
119 tuted pathname string exceeded {PATH_MAX}.
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123 Example 1 Create a directory.
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126 The following example demonstrates how to create a directory named
127 /home/cnd/mod1, with read, write, and search permissions for owner and
128 group, and with read and search permissions for others.
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131 #include <sys/types.h>
132 #include <sys/stat.h>
133 int status;
134 ...
135 status = mkdir("/home/cnd/mod1",
136 S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
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140 See attributes(5) for descriptions of the following attributes:
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145 ┌─────────────────────────────┬─────────────────────────────┐
146 │ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
147 ├─────────────────────────────┼─────────────────────────────┤
148 │Interface Stability │Standard │
149 ├─────────────────────────────┼─────────────────────────────┤
150 │MT-Level │Async-Signal-Safe │
151 └─────────────────────────────┴─────────────────────────────┘
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154 chmod(2), mknod(2), umask(2), mkdirp(3GEN), stat.h(3HEAD),
155 attributes(5), standards(5)
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159SunOS 5.11 18 May 2007 mkdir(2)