1 /* Copyright (C) 1991, 92, 93, 95, 96, 97, 98 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
23 #include <sys/types.h>
29 static int getttyname_r __P ((int fd, char *buf, size_t buflen,
30 dev_t mydev, ino_t myino, int save,
31 int *dostat)) internal_function;
35 getttyname_r (fd, buf, buflen, mydev, myino, save, dostat)
47 size_t devlen = strlen (buf);
49 dirstream = opendir (buf);
50 if (dirstream == NULL)
56 while ((d = readdir (dirstream)) != NULL)
57 if (((ino_t) d->d_fileno == myino || *dostat)
58 && strcmp (d->d_name, "stdin")
59 && strcmp (d->d_name, "stdout")
60 && strcmp (d->d_name, "stderr"))
63 size_t needed = _D_EXACT_NAMLEN (d) + 1;
68 (void) closedir (dirstream);
73 cp = __stpncpy (buf + devlen, d->d_name, needed);
76 if (stat (buf, &st) == 0
77 #ifdef _STATBUF_ST_RDEV
78 && S_ISCHR (st.st_mode) && st.st_rdev == mydev
80 && (ino_t) d->d_fileno == myino && st.st_dev == mydev
84 (void) closedir (dirstream);
90 (void) closedir (dirstream);
92 /* It is not clear what to return in this case. `isatty' says FD
93 refers to a TTY but no entry in /dev has this inode. */
97 /* Store at most BUFLEN character of the pathname of the terminal FD is
98 open on in BUF. Return 0 on success, otherwise an error number. */
100 __ttyname_r (fd, buf, buflen)
110 /* Test for the absolute minimal size. This makes life easier inside
114 __set_errno (EINVAL);
118 if (buflen < sizeof ("/dev/pts/"))
120 __set_errno (ERANGE);
126 __set_errno (ENOTTY);
130 if (fstat (fd, &st) < 0)
133 /* Prepare the result buffer. */
134 memcpy (buf, "/dev/pts/", sizeof ("/dev/pts/"));
135 buflen -= sizeof ("/dev/pts/") - 1;
137 if (stat (buf, &st1) == 0 && S_ISDIR (st1.st_mode))
139 #ifdef _STATBUF_ST_RDEV
140 ret = getttyname_r (fd, buf, buflen, st.st_rdev, st.st_ino, save,
143 ret = getttyname_r (fd, buf, buflen, st.st_dev, st.st_ino, save,
153 if (ret && dostat != -1)
155 buf[sizeof ("/dev/") - 1] = '\0';
156 buflen += sizeof ("pts/") - 1;
157 #ifdef _STATBUF_ST_RDEV
158 ret = getttyname_r (fd, buf, buflen, st.st_rdev, st.st_ino, save,
161 ret = getttyname_r (fd, buf, buflen, st.st_dev, st.st_ino, save,
166 if (ret && dostat != -1)
168 buf[sizeof ("/dev/") - 1] = '\0';
170 #ifdef _STATBUF_ST_RDEV
171 ret = getttyname_r (fd, buf, buflen, st.st_rdev, st.st_ino,
174 ret = getttyname_r (fd, buf, buflen, st.st_dev, st.st_ino,
182 weak_alias (__ttyname_r, ttyname_r)