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DEVNAME(3)	       FreeBSD Library Functions Manual		    DEVNAME(3)

NAME
     devname --	get device name

LIBRARY
     Standard C	Library	(libc, -lc)

SYNOPSIS
     #include <sys/stat.h>
     #include <stdlib.h>

     char *
     devname(dev_t dev,	mode_t type);

     char *
     devname_r(dev_t dev, mode_t type, char *buf, int len);

     char *
     fdevname(int fd);

     char *
     fdevname_r(int fd,	char *buf, int len);

DESCRIPTION
     The devname() function returns a pointer to the name of the block or
     character device in /dev with a device number of dev, and a file type
     matching the one encoded in type which must be one	of S_IFBLK or S_IFCHR.
     To	find the right name, devname() asks the	kernel via the kern.devname
     sysctl.  If it is unable to come up with a	suitable name, it will format
     the information encapsulated in dev and type in a human-readable format.

     The fdevname() and	fdevname_r() function obtains the device name directly
     from a file descriptor pointing to	a character device.  If	it is unable
     to	come up	with a suitable	name, these functions will return a NULL
     pointer.

     devname() and fdevname() return the name stored in	a static buffer	which
     will be overwritten on subsequent calls.  devname_r() and fdevname_r()
     take a buffer and length as argument to avoid this	problem.

EXAMPLES
     int fd;
     struct stat buf;
     char *name;

	     fd	= open("/dev/tun");
	     fstat(fd, &buf);
	     printf("devname is	/dev/%s\n", devname(buf.st_rdev, S_IFCHR));
	     printf("fdevname is /dev/%s\n", fdevname(fd));

SEE ALSO
     stat(2)

HISTORY
     The devname() function appeared in	4.4BSD.	 The fdevname()	function
     appeared in FreeBSD 8.0.

FreeBSD	10.1		       February	22, 2005		  FreeBSD 10.1

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | EXAMPLES | SEE ALSO | HISTORY

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