DEVNAME(3) | Library Functions Manual | DEVNAME(3) |
devname
, devname_r
—
#include <stdlib.h>
#include <sys/stat.h>
char *
devname
(dev_t
dev, mode_t
type);
int
devname_r
(dev_t
dev, mode_t type,
char *path,
size_t len);
devname
() function returns a pointer to the static
buffer with 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. If no
device matches the specified values, or no information is available,
NULL
is returned.
The devname_r
() function is a reentrant
and thread-safe version of devname
(). This function
returns the device name by copying it into the path
argument with up to len characters. The
path argument is always nul-terminated.
The traditional display for applications when no device is found is the string “??”.
devname
() returns a pointer to a
nul-terminated string containing the name of the device. If an error occurs
devname will return NULL
.
If successful, devname_r
() places a
nul-terminated string containing the name of the device in the buffer
pointed to by path and returns 0. If an error occurs
devname_r
() will return an error number from
<sys/errno.h>
indicating
what went wrong.
devname_r
() function may fail if:
devname
function call appeared in
4.4BSD.
The devname_r
() function first appeared in
NetBSD 6.0.
September 9, 2017 | NetBSD 9.0 |