| devname.3 (165903) | devname.3 (188497) |
|---|---|
| 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. --- 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 | 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. --- 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 $ | 29.\" $FreeBSD: head/lib/libc/gen/devname.3 188497 2009-02-11 20:24:59Z ed $ |
| 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" | 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.Ft char * 47.Fn fdevname "int fd" 48.Ft char * 49.Fn fdevname_r "int fd" "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 , --- 10 unchanged lines hidden (view full) --- 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 | 50.Sh DESCRIPTION 51The 52.Fn devname 53function returns a pointer to the name of the block or character 54device in 55.Pa /dev 56with a device number of 57.Fa dev , --- 10 unchanged lines hidden (view full) --- 68sysctl. 69If it is unable to come up with a suitable name, 70it will format the information encapsulated in 71.Fa dev 72and 73.Fa type 74in a human-readable format. 75.Pp |
| 76The 77.Fn fdevname 78and 79.Fn fdevname_r 80function obtains the device name directly from a file descriptor 81pointing to a character device. 82If it is unable to come up with a suitable name, these functions will 83return a NULL pointer. 84.Pp |
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| 72.Fn devname | 85.Fn devname |
| 73returns the name stored in a static buffer which will be overwritten | 86and 87.Fn fdevname 88return the name stored in a static buffer which will be overwritten |
| 74on subsequent calls. 75.Fn devname_r | 89on subsequent calls. 90.Fn devname_r |
| 76takes a buffer and length as argument to avoid this problem. | 91and 92.Fn fdevname_r 93take 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)); | 94.Sh EXAMPLES 95.Bd -literal -compact 96int fd; 97struct stat buf; 98char *name; 99 100 fd = open("/dev/tun"); 101 fstat(fd, &buf); 102 printf("devname is /dev/%s\en", devname(buf.st_rdev, S_IFCHR)); |
| 103 printf("fdevname is /dev/%s\en", fdevname(fd)); |
|
| 86.Ed 87.Sh SEE ALSO 88.Xr stat 2 89.Sh HISTORY 90The 91.Fn devname 92function appeared in 93.Bx 4.4 . | 104.Ed 105.Sh SEE ALSO 106.Xr stat 2 107.Sh HISTORY 108The 109.Fn devname 110function appeared in 111.Bx 4.4 . |
| 112The 113.Fn fdevname 114function appeared in 115.Fx 8.0 . |
|