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28 .\" @(#)devname.3 8.2 (Berkeley) 4/29/95
43 .Fn devname "dev_t dev" "mode_t type"
45 .Fn devname_r "dev_t dev" "mode_t type" "char *buf" "int len"
49 .Fn fdevname_r "int fd" "char *buf" "int len"
53 function returns a pointer to the name of the block or character
56 with a device number of
58 and a file type matching the one encoded in
64 To find the right name,
66 asks the kernel via the
69 If it is unable to come up with a suitable name,
70 it will format the information encapsulated in
74 in a human-readable format.
80 function obtains the device name directly from a file descriptor
81 pointing to a character device.
82 If it is unable to come up with a suitable name, these functions will
83 return a NULL pointer.
88 return the name stored in a static buffer which will be overwritten
93 take a buffer and length as argument to avoid this problem.
100 fd = open("/dev/tun");
102 printf("devname is /dev/%s\en", devname(buf.st_rdev, S_IFCHR));
103 printf("fdevname is /dev/%s\en", fdevname(fd));