mknod - make a directory, a special file, or a regular file
#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.
The file type is specified in mode by the S_IFMT bits, which must be set to one of the following values:
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.|
Set group ID on execution if # is 7, 5, 3, or 1. Enable mandatory file/record locking if # is 6, 4, 2, or 0
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.
The access permission bits of mode are modified by the process's file mode creation mask: all bits set in the process's 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.
Upon successful completion, mknod() returns 0. Otherwise, it returns -1, the new file is not created, and errno is set to indicate the error.
The mknod() function will fail if:
The mknod() function may fail if:
Applications should use the mkdir(2) function to create a directory because appropriate permissions are not required and because mknod() might not establish directory entries for the directory itself (.) and the parent directory (..). The mknod() function can be invoked only by a privileged user for file types other than FIFO special. The mkfifo(3C) function should be used to create FIFOs.
Doors are created using door_create(3C) and can be attached to the file system using fattach(3C). Symbolic links can be created using symlink(2). An endpoint for communication can be created using socket(3SOCKET).
See attributes(5) for descriptions of the following attributes:
chmod(2), creat(2), exec(2), mkdir(2), open(2), stat(2), symlink(2), umask(2), door_create(3C), fattach(3C), makedev(3C), mkfifo(3C), socket(3SOCKET), stat.h(3HEAD), attributes(5), privileges(5), standards(5)
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Created 1996-2021 by Maxim Chirkov
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