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29 * @(#)ttyname.c 8.2 (Berkeley) 1/27/94
30 * $FreeBSD: src/lib/libc/gen/ttyname.c,v 1.24 2007/01/09 00:27:55 imp Exp $
31 * $DragonFly: src/lib/libc/gen/ttyname.c,v 1.14 2005/11/19 22:32:53 swildner Exp $
34 #include "namespace.h"
35 #include <sys/types.h>
44 #include <machine/stdint.h>
46 #include <sys/ioctl.h>
47 #include "reentrant.h"
48 #include "un-namespace.h"
50 #include "libc_private.h"
52 #define TTYNAME_DEVFS_COMPAT 1
54 static char ttyname_buf[sizeof(_PATH_DEV) + NAME_MAX];
56 static once_t ttyname_init_once = ONCE_INITIALIZER;
57 static thread_key_t ttyname_key;
58 static int ttyname_keycreated = 0;
61 ttyname_r(int fd, char *buf, size_t len)
64 struct fiodname_args fa;
69 /* Must be a valid file descriptor */
72 /* Must be a character device */
73 if (!S_ISCHR(sb.st_mode))
75 /* Must be a terminal. */
78 /* Must have enough room */
79 if (len <= sizeof(_PATH_DEV))
82 strcpy(buf, _PATH_DEV);
86 if (_ioctl(fd, FIODNAME, &fa) == -1) {
87 #ifdef TTYNAME_DEVFS_COMPAT
88 /* If compat mode is set, fall back to old method */
89 devname_r(sb.st_rdev, S_IFCHR, buf + used, len - used);
98 ttyname_keycreate(void)
100 ttyname_keycreated = (thr_keycreate(&ttyname_key, free) == 0);
112 if (thr_once(&ttyname_init_once, ttyname_keycreate) != 0 ||
115 if ((buf = thr_getspecific(ttyname_key)) == NULL) {
116 if ((buf = malloc(sizeof ttyname_buf)) == NULL)
118 if (thr_setspecific(ttyname_key, buf) != 0) {
125 if (((error = ttyname_r(fd, buf, sizeof ttyname_buf))) != 0) {