devname(3) - NetBSD Manual Pages

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DEVNAME(3)              NetBSD Library Functions Manual             DEVNAME(3)

devname, devname_r -- get device name
Standard C Library (libc, -lc)
#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);
The 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 ``??''.
If successful, 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.
/var/run/dev.cdb Device database file.
The devname_r() function may fail if: [ENOENT] The corresponding device does not exist. [ERANGE] The passed buffer length is too short.
stat(2), dev_mkdb(8)
The devname function call appeared in 4.4BSD. The devname_r() function first appeared in NetBSD 6.0. NetBSD 9.3 September 9, 2017 NetBSD 9.3
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