mkfifo - Create a FIFO
#include <sys/types.h> #include <sys/stat.h>
int mkfifo(
const char *path,
mode_t mode );
Standard C Library (libc)
System V Compatibility Library (libsys5.a)
Interfaces documented on this reference page conform to
industry standards as follows:
mkfifo(): POSIX.1, XPG4, XPG4-UNIX
Refer to the standards(5) reference page for more information
about industry standards and associated tags.
Names the new file. If the final component of the path
parameter names a symbolic link, the link will be traversed
and pathname resolution will continue. Specifies
the type, attributes, and access permissions of the file.
This parameter is constructed by logically ORing values
described in the sys/mode.h header file.
The mode is then modified by the current file mode
creation mask (umask) value.
The mkfifo function used with libc.a is an interface to
the mknod function, where the file that is to be created
is a FIFO special file (named pipe).
When used with libsys5.a, the mkfifo() function creates a
uni-directional STREAMS based file descriptor.
No special system privileges are required under either
implementation.
Upon successful completion, the mkfifo() function marks
the st_atime, st_ctime, and st_mtime fields of the file
for update, and sets the st_ctime and st_mtime fields of
the directory that contains the new entry for update.
Upon successful completion of mkfifo(), a value of 0
(zero) is returned. Otherwise, a value of -1 is returned
and errno is set to indicate the error.
If the mkfifo() function fails, the new file is not created
and errno may be set to one of the following values:
A component of the path prefix denies search permission,
or write permission is denied on the parent directory of
the FIFO to be created. The directory in which the entry
for the new link is being placed cannot be extended
because the user's quota of disk blocks or inodes on the
file system is exhausted. The named file exists. Too
many links were encountered in translating path. No more
file descriptors are available for this process. The system
file table is full, or the device containing the pipes
has no free inodes. The length of the path parameter
exceeds PATH_MAX or a pathname component is longer than
NAME_MAX. A component of the path prefix does not exist
or the path parameter points to an empty string. 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 mode parameter specifies a file type other than
S_IFIFO and the calling process does not have the DEV_CONFIG
system privilege. The directory in which the file is
to be created is located on a read-only file system.
Commands: chmod(1), mkdir(1), mkfifo(1)
Functions: chmod(2), mkdir(2), mknod(2), mq_open(2),
open(2), sem_open(2), stat(2), umask(2)
Standards: standards(5)
Other: sys_attrs_vfs(5)
mkfifo(3)
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