NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | USAGE | SUMMARY OF TRUSTED SOLARIS CHANGES | SEE ALSO
#include <sys/stat.h>int mknod(const char *path, mode_t mode, dev_t dev);
The mknod() function creates a new file named by the path name pointed to by path. The file type and permissions of the new file are initialized from mode. This system call will not create an object in a multilevel directory. Single-level directories are automatically created during path-name lookup and getsldname(2).
The new object is created with its sensitivity label set to the sensitivity label of the calling process. If the containing directory has a default access control list (ACL), the ACL is copied to the new object as its access ACL.
The file type is specified in mode by the S_IFMT bits, which must be set to one of the following values:
fifo special
character special
directory
block special
ordinary file
The file access permissions are specified in mode by the 0007777 bits, and may be constructed by a bitwise OR operation of the following values:
S_ISUID |
04000 |
Set user ID on execution. |
S_ISGID |
020#0 |
Set group ID on execution if # is 7, 5, 3, or 1. Enable mandatory file/record locking if # is 6, 4, 2, or 0 |
S_ISVTX |
01000 |
Save text image after execution. |
S_IRWXU |
00700 |
Read, write, execute by owner. |
S_IRUSR |
00400 |
Read by owner. |
S_IWUSR |
00200 |
Write by owner. |
S_IXUSR |
00100 |
Execute (search if a directory) by owner. |
S_IRWXG |
00070 |
Read, write, execute by group. |
S_IRGRP |
00040 |
Read by group. |
S_IWGRP |
00020 |
Write by group. |
S_IXGRP |
00010 |
Execute by group. |
S_IRWXO |
00007 |
Read, write, execute (search) by others. |
S_IROTH |
00004 |
Read by others. |
S_IWOTH |
00002 |
Write by others. |
S_IXOTH |
00001 |
Execute by others. |
S_ISVTX |
|
On directories, restricted deletion flag. |
The owner ID of the file is set to the effective user ID of the process. The group ID of the file is set to the effective group ID of the process. However, if the S_ISGID bit is
set in the parent directory, then the group ID of the file is inherited from the parent. If the group ID of the new file does not match the effective group ID or one of the supplementary group IDs, the S_ISGID
bit is cleared. To override this restriction,the calling process may assert the PRIV_FILE_SETID
privilege.
If the file is not a directory, mode bit 01000 (save text image on execution) is cleared. The calling process may
assert the PRIV_SYS_CONFIG
privilege to override this restriction.
The access permission bits of mode are modified by the process' file mode creation mask: all bits set in the process' file mode creation mask are cleared (see umask(2)). If mode indicates a block or character special file, dev is a configuration-dependent specification of a character or block I/O device. If mode does not indicate a block special or character special device, dev is ignored. See makedev(3C).
If path is a symbolic link, it is not followed.
The mknod() function will fail if:
The calling process does not have search access to all directories in the object's path. To override this restriction, the calling process may assert one or both of these privileges: PRIV_FILE_DAC_SEARCH
and PRIV_FILE_MAC_SEARCH
.
The calling process does not have write access to the object's containing directory. To override this restriction, the calling process may assert one or both of these privileges: PRIV_FILE_DAC_WRITE
and PRIV_FILE_MAC_WRITE
.
The directory where the new file entry is being placed cannot be extended because the user's quota of disk blocks on that file system has been exhausted, or the user's quota of inodes on the file system where the file is being created has been exhausted.
The named file exists.
The path argument points to an illegal address.
A signal was caught during the execution of the mknod() function.
An invalid argument exists.
An I/O error occurred while accessing the file system.
Too many symbolic links were encountered in translating path.
The length of the path argument exceeds PATH_MAX, or the length of a path component exceeds NAME_MAX while _POSIX_NO_TRUNC is in effect.
A component of the path prefix specified by path does not name an existing directory or path is an empty string.
The path argument points to a remote machine and the link to that machine is no longer active.
The directory that would contain the new file cannot be extended or the file system is out of file allocation resources.
A component of the path prefix is not a directory.
The value in mode is not a FIFO and the calling process has not asserted the PRIV_SYS_DEVICES
privilege.
The directory in which the file is to be created is located on a read-only file system.
The mknod() function may fail if:
Pathname resolution of a symbolic link produced an intermediate result whose length exceeds PATH_MAX.
Normally, applications should use the mkdir(2) routine to make a directory, since the function mknod() may not establish directory entries for the directory itself (.) and the parent directory (. .), and appropriate permissions are not required. Similarly, mkfifo(3C) should be used in place of mknod() in order to create FIFOs.
Appropriate privilege is required to override access checks.
The new object is created with its sensitivity label set to the sensitivity label of the calling process. If the containing directory has a default access control list (ACL), the ACL is copied to the new object as its access ACL.
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | USAGE | SUMMARY OF TRUSTED SOLARIS CHANGES | SEE ALSO