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mkfifo(3c)
Standard C Library Functions mkfifo(3C)
NAME
mkfifo, mkfifoat - make a FIFO special file
SYNOPSIS
#include <sys/stat.h>
int mkfifo(const char *path, mode_t mode);
int mkfifoat(int fd, const char *path, mode_t mode);
DESCRIPTION
The mkfifo() function creates a new FIFO special file named by the
pathname pointed to by path. The file permission bits of the new FIFO
are initialized from mode. The file permission bits of the mode argu‐
ment are modified by the process's file creation mask (see umask(2)).
Bits other than the file permission bits in mode are ignored.
If path names a symbolic link, mkfifo() fails and sets errno to EEXIST.
The FIFO's user ID is set to the process's effective user ID. The
FIFO's group ID is set to the group ID of the parent directory or to
the effective group ID of the process.
The mkfifo() function calls mknod(2) to create the file.
Upon successful completion, mkfifo() marks for update the st_atime,
st_ctime, and st_mtime fields of the file. Also, the st_ctime and
st_mtime fields of the directory that contains the new entry are marked
for update.
The mkfifoat() function is equivalent to mkfifo() except in the case
where path specifies a relative path. In this case the newly created
FIFO is created relative to the directory associated with the file
descriptor fd instead of the current working directory. If the file
descriptor was opened without O_SEARCH, the function checks whether
directory searches are permitted using the current permissions of the
directory underlying the file descriptor. If the file descriptor was
opened with O_SEARCH, the function does not perform the check
If mkfifoat() is passed the special value AT_FDCWD in the fd parameter,
the current working directory is used and the is be identical to a call
to mkfifo().
RETURN VALUES
Upon successful completion, 0 is returned. Otherwise, −1 is returned
and errno is set to indicate the error.
ERRORS
The mkfifo() and mkfifoat() functions will fail if:
EACCES A component of the path prefix denies search permis‐
sion, or write permission is denied on the parent
directory of the FIFO to be created.
EEXIST The named file already exists.
ELOOP A loop exists in symbolic links encountered during res‐
olution of the path argument.
ENAMETOOLONG The length of the path argument exceeds {PATH_MAX} or a
pathname component is longer than {NAME_MAX}.
ENOENT A component of the path prefix specified by path does
not name an existing directory or path is an empty
string.
ENOSPC The directory that would contain the new file cannot be
extended or the file system is out of file-allocation
resources.
ENOTDIR A component of the path prefix is not a directory.
EROFS The named file resides on a read-only file system.
The mkfifoat() functions will fail if:
EACCES fd was not opened with O_SEARCH and the permissions of the
directory underlying fd do not permit directory searches.
EBADF The path argument does not specify an absolute path and the
fd argument is neither AT_FDCWD nor a valid file descriptor
open for reading or searching.
The mkfifo() and mkfifoat() functions may fail if:
ELOOP Too many symbolic links were encountered in resolving
path.
ENAMETOOLONG The length of the path argument exceeds {PATH_MAX} or a
pathname component is longer than {NAME_MAX}.
The mkfifoat() functions may fail if:
ENOTDIR The path argument is not an absolute path and fd is neither
AT_FDCWD nor a file descriptor associated with a directory.
EXAMPLES
Example 1 Create a FIFO File
The following example demonstrates how to create a FIFO file named
/home/cnd/mod_done with read and write permissions for the owner and
read permissions for the group and others.
#include <sys/stat.h>
int status;
...
status = mkfifo("/home/cnd/mod_done", S_IWUSR | S_IRUSR |
S_IRGRP | S_IROTH);
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelAsync-Signal-
Safe _ StandardSee standards(7).
SEE ALSO
mkdir(1), chmod(2), exec(2), mknod(2), umask(2), stat.h(3HEAD),
ufs(4FS), attributes(7), standards(7)
Oracle Solaris 11.4 17 Aug 2018 mkfifo(3C)