DEVNAME(3) BSD Library Functions Manual DEVNAME(3)NAME
devname -- get device name
Standard C Library (libc, -lc)
devname(dev_t dev, mode_t type);
devname_r(dev_t dev, mode_t type, char *buf, int len);
fdevname_r(int fd, char *buf, int len);
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
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.
struct stat buf;
fd = open("/dev/tun");
printf("devname is /dev/%s
", devname(buf.st_rdev, S_IFCHR));
printf("fdevname is /dev/%s
SEE ALSO stat(2)HISTORY
The devname() function appeared in 4.4BSD. The fdevname() function appeared in FreeBSD 8.0.
BSD February 22, 2005 BSD
Check Out this Related Man Page
GETDEVMAJOR(3) BSD Library Functions Manual GETDEVMAJOR(3)NAME
getdevmajor -- get block or character device major number
Standard C Library (libc, -lc)
getdevmajor(const char *name, mode_t type);
The getdevmajor() function returns the major device number of the block or character device specified by name 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, no information is available, or an error occurs, NODEVMAJOR is returned and errno is set to indi-
cate the error.
To retrieve the major number for pty(4) slave devices (aka pts devices):
pts = getdevmajor("pts", S_IFCHR);
To retrieve the major numbers for the block and character wd(4) devices:
devmajor_t c, b;
c = getdevmajor("wd", S_IFCHR);
b = getdevmajor("wd", S_IFBLK);
The getdevmajor() function may fail and set errno for any of the errors specified for the library functions malloc(3) and sysctlbyname(3).
In addition, the following errors may be reported:
[EINVAL] The value of the type argument is not S_IFCHR or S_IFBLK.
[ENOENT] The named device is not found.
SEE ALSO stat(2), devname(3), malloc(3), sysctlbyname(3)HISTORY
The getdevmajor() function call appeared in NetBSD 3.0.
BSD January 20, 2009 BSD
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