getdevmajor(3) - NetBSD Manual Pages

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GETDEVMAJOR(3)          NetBSD Library Functions Manual         GETDEVMAJOR(3)


NAME

     getdevmajor -- get block or character device major number


LIBRARY

     Standard C Library (libc, -lc)


SYNOPSIS

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

     devmajor_t
     getdevmajor(const char *name, mode_t type);


DESCRIPTION

     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.


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_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.

NetBSD 6.1.2                   January 20, 2009                   NetBSD 6.1.2