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mkfifo.2 (84306) mkfifo.2 (108028)
1.\" Copyright (c) 1990, 1991, 1993
2.\" The Regents of the University of California. All rights reserved.
3.\"
4.\" Redistribution and use in source and binary forms, with or without
5.\" modification, are permitted provided that the following conditions
6.\" are met:
7.\" 1. Redistributions of source code must retain the above copyright
8.\" notice, this list of conditions and the following disclaimer.
9.\" 2. Redistributions in binary form must reproduce the above copyright
10.\" notice, this list of conditions and the following disclaimer in the
11.\" documentation and/or other materials provided with the distribution.
12.\" 3. All advertising materials mentioning features or use of this software
13.\" must display the following acknowledgement:
14.\" This product includes software developed by the University of
15.\" California, Berkeley and its contributors.
16.\" 4. Neither the name of the University nor the names of its contributors
17.\" may be used to endorse or promote products derived from this software
18.\" without specific prior written permission.
19.\"
20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30.\" SUCH DAMAGE.
31.\"
32.\" @(#)mkfifo.2 8.1 (Berkeley) 6/4/93
1.\" Copyright (c) 1990, 1991, 1993
2.\" The Regents of the University of California. All rights reserved.
3.\"
4.\" Redistribution and use in source and binary forms, with or without
5.\" modification, are permitted provided that the following conditions
6.\" are met:
7.\" 1. Redistributions of source code must retain the above copyright
8.\" notice, this list of conditions and the following disclaimer.
9.\" 2. Redistributions in binary form must reproduce the above copyright
10.\" notice, this list of conditions and the following disclaimer in the
11.\" documentation and/or other materials provided with the distribution.
12.\" 3. All advertising materials mentioning features or use of this software
13.\" must display the following acknowledgement:
14.\" This product includes software developed by the University of
15.\" California, Berkeley and its contributors.
16.\" 4. Neither the name of the University nor the names of its contributors
17.\" may be used to endorse or promote products derived from this software
18.\" without specific prior written permission.
19.\"
20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30.\" SUCH DAMAGE.
31.\"
32.\" @(#)mkfifo.2 8.1 (Berkeley) 6/4/93
33.\" $FreeBSD: head/lib/libc/sys/mkfifo.2 84306 2001-10-01 16:09:29Z ru $
33.\" $FreeBSD: head/lib/libc/sys/mkfifo.2 108028 2002-12-18 09:22:32Z ru $
34.\"
35.Dd June 4, 1993
36.Dt MKFIFO 2
37.Os
38.Sh NAME
39.Nm mkfifo
40.Nd make a fifo file
41.Sh LIBRARY
42.Lb libc
43.Sh SYNOPSIS
44.In sys/types.h
45.In sys/stat.h
46.Ft int
47.Fn mkfifo "const char *path" "mode_t mode"
48.Sh DESCRIPTION
34.\"
35.Dd June 4, 1993
36.Dt MKFIFO 2
37.Os
38.Sh NAME
39.Nm mkfifo
40.Nd make a fifo file
41.Sh LIBRARY
42.Lb libc
43.Sh SYNOPSIS
44.In sys/types.h
45.In sys/stat.h
46.Ft int
47.Fn mkfifo "const char *path" "mode_t mode"
48.Sh DESCRIPTION
49.Fn Mkfifo
49The
50.Fn mkfifo
51system call
50creates a new fifo file with name
51.Fa path .
52The access permissions are
53specified by
54.Fa mode
55and restricted by the
56.Xr umask 2
57of the calling process.
58.Pp
59The fifo's owner ID is set to the process's effective user ID.
60The fifo's group ID is set to that of the parent directory in
61which it is created.
62.Sh RETURN VALUES
63.Rv -std mkfifo
64.Sh ERRORS
52creates a new fifo file with name
53.Fa path .
54The access permissions are
55specified by
56.Fa mode
57and restricted by the
58.Xr umask 2
59of the calling process.
60.Pp
61The fifo's owner ID is set to the process's effective user ID.
62The fifo's group ID is set to that of the parent directory in
63which it is created.
64.Sh RETURN VALUES
65.Rv -std mkfifo
66.Sh ERRORS
65.Fn Mkfifo
67The
68.Fn mkfifo
69system call
66will fail and no fifo will be created if:
67.Bl -tag -width Er
68.It Bq Er ENOTSUP
69The kernel has not been configured to support fifo's.
70.It Bq Er ENOTDIR
71A component of the path prefix is not a directory.
72.It Bq Er ENAMETOOLONG
73A component of a pathname exceeded 255 characters,
74or an entire path name exceeded 1023 characters.
75.It Bq Er ENOENT
76A component of the path prefix does not exist.
77.It Bq Er EACCES
78Search permission is denied for a component of the path prefix.
79.It Bq Er ELOOP
80Too many symbolic links were encountered in translating the pathname.
81.It Bq Er EROFS
82The named file resides on a read-only file system.
83.It Bq Er EEXIST
84The named file exists.
85.It Bq Er ENOSPC
86The directory in which the entry for the new fifo is being placed
87cannot be extended because there is no space left on the file
88system containing the directory.
89.It Bq Er ENOSPC
90There are no free inodes on the file system on which the
91fifo is being created.
92.It Bq Er EDQUOT
93The directory in which the entry for the new fifo
94is being placed cannot be extended because the
95user's quota of disk blocks on the file system
96containing the directory has been exhausted.
97.It Bq Er EDQUOT
98The user's quota of inodes on the file system on
99which the fifo is being created has been exhausted.
100.It Bq Er EIO
101An
102.Tn I/O
103error occurred while making the directory entry or allocating the inode.
104.It Bq Er EIO
105An
106.Tn I/O
107error occurred while reading from or writing to the file system.
108.It Bq Er EFAULT
109.Fa Path
110points outside the process's allocated address space.
111.El
112.Sh SEE ALSO
113.Xr chmod 2 ,
114.Xr mknod 2 ,
115.Xr stat 2 ,
116.Xr umask 2
117.Sh STANDARDS
118The
119.Fn mkfifo
70will fail and no fifo will be created if:
71.Bl -tag -width Er
72.It Bq Er ENOTSUP
73The kernel has not been configured to support fifo's.
74.It Bq Er ENOTDIR
75A component of the path prefix is not a directory.
76.It Bq Er ENAMETOOLONG
77A component of a pathname exceeded 255 characters,
78or an entire path name exceeded 1023 characters.
79.It Bq Er ENOENT
80A component of the path prefix does not exist.
81.It Bq Er EACCES
82Search permission is denied for a component of the path prefix.
83.It Bq Er ELOOP
84Too many symbolic links were encountered in translating the pathname.
85.It Bq Er EROFS
86The named file resides on a read-only file system.
87.It Bq Er EEXIST
88The named file exists.
89.It Bq Er ENOSPC
90The directory in which the entry for the new fifo is being placed
91cannot be extended because there is no space left on the file
92system containing the directory.
93.It Bq Er ENOSPC
94There are no free inodes on the file system on which the
95fifo is being created.
96.It Bq Er EDQUOT
97The directory in which the entry for the new fifo
98is being placed cannot be extended because the
99user's quota of disk blocks on the file system
100containing the directory has been exhausted.
101.It Bq Er EDQUOT
102The user's quota of inodes on the file system on
103which the fifo is being created has been exhausted.
104.It Bq Er EIO
105An
106.Tn I/O
107error occurred while making the directory entry or allocating the inode.
108.It Bq Er EIO
109An
110.Tn I/O
111error occurred while reading from or writing to the file system.
112.It Bq Er EFAULT
113.Fa Path
114points outside the process's allocated address space.
115.El
116.Sh SEE ALSO
117.Xr chmod 2 ,
118.Xr mknod 2 ,
119.Xr stat 2 ,
120.Xr umask 2
121.Sh STANDARDS
122The
123.Fn mkfifo
120function call is expected to conform to
124system call is expected to conform to
121.St -p1003.1-90 .
125.St -p1003.1-90 .