1 /* Copyright (C) 1991,92,93,1995-1999,2000,2001 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 Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the 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 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
23 #include <sys/types.h>
29 #include <machine/weakalias.h>
31 static int getttyname_r (char *buf, size_t buflen,
32 dev_t mydev, ino64_t myino, int save,
35 extern struct dirent64 *__readdir64 (DIR *);
38 getttyname_r (char *buf, size_t buflen, dev_t mydev, ino64_t myino,
39 int save, int *dostat)
44 size_t devlen = strlen (buf);
46 dirstream = opendir (buf);
47 if (dirstream == NULL)
53 while ((d = __readdir64 (dirstream)) != NULL)
55 if ((d->d_ino == myino || *dostat)
56 && strcmp (d->d_name, "stdin")
57 && strcmp (d->d_name, "stdout")
58 && strcmp (d->d_name, "stderr"))
60 size_t needed = strlen (d->d_name) + 1;
65 (void) closedir (dirstream);
70 strncpy (buf + devlen, d->d_name, needed);
72 if (stat64 (buf, &st) == 0
73 #ifdef _STATBUF_ST_RDEV
74 && S_ISCHR (st.st_mode) && st.st_rdev == mydev
76 && d->d_ino == myino && st.st_dev == mydev
80 (void) closedir (dirstream);
87 (void) closedir (dirstream);
89 /* It is not clear what to return in this case. `isatty' says FD
90 refers to a TTY but no entry in /dev has this inode. */
94 /* Store at most BUFLEN character of the pathname of the terminal FD is
95 open on in BUF. Return 0 on success, otherwise an error number. */
97 __ttyname_r (int fd, char *buf, size_t buflen)
100 struct stat64 st, st1;
105 /* Test for the absolute minimal size. This makes life easier inside
109 __set_errno (EINVAL);
113 if (buflen < sizeof ("/dev/pts/"))
115 __set_errno (ERANGE);
121 __set_errno (ENOTTY);
125 /* We try using the /proc filesystem. */
126 sprintf (procname, "/proc/self/fd/%d", fd);
128 ret = readlink (procname, buf, buflen - 1);
129 if (ret != -1 && buf[0] != '[')
134 if (ret == -1 && errno == ENAMETOOLONG)
136 __set_errno (ERANGE);
140 if (fstat64 (fd, &st) < 0)
143 /* Prepare the result buffer. */
144 memcpy (buf, "/dev/pts/", sizeof ("/dev/pts/"));
145 buflen -= sizeof ("/dev/pts/") - 1;
147 if (stat64 (buf, &st1) == 0 && S_ISDIR (st1.st_mode))
149 #ifdef _STATBUF_ST_RDEV
150 ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, save,
153 ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save,
163 if (ret && dostat != -1)
165 buf[sizeof ("/dev/") - 1] = '\0';
166 buflen += sizeof ("pts/") - 1;
167 #ifdef _STATBUF_ST_RDEV
168 ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, save,
171 ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save,
176 if (ret && dostat != -1)
178 buf[sizeof ("/dev/") - 1] = '\0';
180 #ifdef _STATBUF_ST_RDEV
181 ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino,
184 ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino,
192 weak_alias (__ttyname_r, ttyname_r)