1.\" Copyright (c) 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.
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21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26.\" SUCH DAMAGE.
27.\"
28.\" @(#)devname.3 8.2 (Berkeley) 4/29/95
29.\" $FreeBSD: head/lib/libc/gen/devname.3 165903 2007-01-09 00:28:16Z imp $
30.\"
31.Dd February 22, 2005
32.Dt DEVNAME 3
33.Os
34.Sh NAME
35.Nm devname
36.Nd "get device name"
37.Sh LIBRARY
38.Lb libc
39.Sh SYNOPSIS
40.In sys/stat.h
41.In stdlib.h
42.Ft char *
43.Fn devname "dev_t dev" "mode_t type"
44.Ft char *
45.Fn devname_r "dev_t dev" "mode_t type" "char *buf" "int len"
46.Sh DESCRIPTION
47The
48.Fn devname
49function returns a pointer to the name of the block or character
50device in
51.Pa /dev
52with a device number of
53.Fa dev ,
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64sysctl.
65If it is unable to come up with a suitable name,
66it will format the information encapsulated in
67.Fa dev
68and
69.Fa type
70in a human-readable format.
71.Pp
72.Fn devname
73returns the name stored in a static buffer which will be overwritten
74on subsequent calls.
75.Fn devname_r
76takes a buffer and length as argument to avoid this problem.
77.Sh EXAMPLES
78.Bd -literal -compact
79int fd;
80struct stat buf;
81char *name;
82
83 fd = open("/dev/tun");
84 fstat(fd, &buf);
85 printf("devname is /dev/%s\en", devname(buf.st_rdev, S_IFCHR));
86.Ed
87.Sh SEE ALSO
88.Xr stat 2
89.Sh HISTORY
90The
91.Fn devname
92function appeared in
93.Bx 4.4 .
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.
--- 12 unchanged lines hidden (view full) ---
21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26.\" SUCH DAMAGE.
27.\"
28.\" @(#)devname.3 8.2 (Berkeley) 4/29/95
29.\" $FreeBSD: head/lib/libc/gen/devname.3 165903 2007-01-09 00:28:16Z imp $
30.\"
31.Dd February 22, 2005
32.Dt DEVNAME 3
33.Os
34.Sh NAME
35.Nm devname
36.Nd "get device name"
37.Sh LIBRARY
38.Lb libc
39.Sh SYNOPSIS
40.In sys/stat.h
41.In stdlib.h
42.Ft char *
43.Fn devname "dev_t dev" "mode_t type"
44.Ft char *
45.Fn devname_r "dev_t dev" "mode_t type" "char *buf" "int len"
46.Sh DESCRIPTION
47The
48.Fn devname
49function returns a pointer to the name of the block or character
50device in
51.Pa /dev
52with a device number of
53.Fa dev ,
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64sysctl.
65If it is unable to come up with a suitable name,
66it will format the information encapsulated in
67.Fa dev
68and
69.Fa type
70in a human-readable format.
71.Pp
72.Fn devname
73returns the name stored in a static buffer which will be overwritten
74on subsequent calls.
75.Fn devname_r
76takes a buffer and length as argument to avoid this problem.
77.Sh EXAMPLES
78.Bd -literal -compact
79int fd;
80struct stat buf;
81char *name;
82
83 fd = open("/dev/tun");
84 fstat(fd, &buf);
85 printf("devname is /dev/%s\en", devname(buf.st_rdev, S_IFCHR));
86.Ed
87.Sh SEE ALSO
88.Xr stat 2
89.Sh HISTORY
90The
91.Fn devname
92function appeared in
93.Bx 4.4 .