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devname_r(3) [osx man page]

DEVNAME(3)						   BSD Library Functions Manual 						DEVNAME(3)

NAME
devname, devname_r -- 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); 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. If no device matches the specified values, or no information is available, NULL is returned. The devname() function uses a static buffer, which will be overwritten on subsequent calls. The devname_r() functions takes a buffer and length as arguments to avoid this problem. The traditional display for applications when no device is found is the string ``??''. SEE ALSO
stat(2), dev_mkdb(8) HISTORY
The devname() function call appeared in 4.4BSD. BSD
October 25, 2004 BSD

Check Out this Related Man Page

GETDEVMAJOR(3)						   BSD 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 indi- cate 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. BSD
January 20, 2009 BSD
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