NAME
getdevmajor —
get block or character device major
number
LIBRARY
library “libc”
SYNOPSIS
#include
<stdlib.h>
#include <sys/stat.h>
devmajor_t
getdevmajor(const
char *name, mode_t
type);
DESCRIPTION
Thegetdevmajor()
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.
RETURN VALUES
If no device matches the specified values, no information is
available, or an error occurs, NODEVMAJOR is
returned and errno is set to indicate the error.
EXAMPLES
To retrieve the major number for pty(4) slave devices (aka pts devices):
#include <stdlib.h>
#include <sys/stat.h>
devmajor_t pts;
pts = getdevmajor("pts", S_IFCHR);
To retrieve the major numbers for the block and character wd(4) devices:
#include <stdlib.h>
#include <sys/stat.h>
devmajor_t c, b;
c = getdevmajor("wd", S_IFCHR);
b = getdevmajor("wd", S_IFBLK);
ERRORS
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_IFCHRorS_IFBLK. - [
ENOENT] - The named device is not found.
SEE ALSO
HISTORY
The getdevmajor() function call appeared
in NetBSD 3.0.