diff options
Diffstat (limited to 'newlib/libc/sys/linux/ttyname_r.c')
| -rw-r--r-- | newlib/libc/sys/linux/ttyname_r.c | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/newlib/libc/sys/linux/ttyname_r.c b/newlib/libc/sys/linux/ttyname_r.c new file mode 100644 index 000000000..a0cc90199 --- /dev/null +++ b/newlib/libc/sys/linux/ttyname_r.c @@ -0,0 +1,194 @@ +/* Copyright (C) 1991,92,93,1995-1999,2000,2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <errno.h> +#include <limits.h> +#include <stddef.h> +#include <dirent.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <unistd.h> +#include <string.h> +#include <stdio.h> +#include <stdlib.h> +#include <machine/weakalias.h> + +static int getttyname_r (char *buf, size_t buflen, + dev_t mydev, ino64_t myino, int save, + int *dostat); + +extern struct dirent64 *__readdir64 (DIR *); + +#define __set_errno(x) (errno = (x)) + +static int +getttyname_r (char *buf, size_t buflen, dev_t mydev, ino64_t myino, + int save, int *dostat) +{ + struct stat64 st; + DIR *dirstream; + struct dirent64 *d; + size_t devlen = strlen (buf); + + dirstream = opendir (buf); + if (dirstream == NULL) + { + *dostat = -1; + return errno; + } + + while ((d = __readdir64 (dirstream)) != NULL) + { + if ((d->d_ino == myino || *dostat) + && strcmp (d->d_name, "stdin") + && strcmp (d->d_name, "stdout") + && strcmp (d->d_name, "stderr")) + { + size_t needed = strlen (d->d_name) + 1; + + if (needed > buflen) + { + *dostat = -1; + (void) closedir (dirstream); + __set_errno (ERANGE); + return ERANGE; + } + + strncpy (buf + devlen, d->d_name, needed); + + if (stat64 (buf, &st) == 0 +#ifdef _STATBUF_ST_RDEV + && S_ISCHR (st.st_mode) && st.st_rdev == mydev +#else + && d->d_ino == myino && st.st_dev == mydev +#endif + ) + { + (void) closedir (dirstream); + __set_errno (save); + return 0; + } + } + } + + (void) closedir (dirstream); + __set_errno (save); + /* It is not clear what to return in this case. `isatty' says FD + refers to a TTY but no entry in /dev has this inode. */ + return ENOTTY; +} + +/* Store at most BUFLEN character of the pathname of the terminal FD is + open on in BUF. Return 0 on success, otherwise an error number. */ +int +__ttyname_r (int fd, char *buf, size_t buflen) +{ + char procname[30]; + struct stat64 st, st1; + int dostat = 0; + int save = errno; + int ret; + + /* Test for the absolute minimal size. This makes life easier inside + the loop. */ + if (!buf) + { + __set_errno (EINVAL); + return EINVAL; + } + + if (buflen < sizeof ("/dev/pts/")) + { + __set_errno (ERANGE); + return ERANGE; + } + + if (!isatty (fd)) + { + __set_errno (ENOTTY); + return ENOTTY; + } + + /* We try using the /proc filesystem. */ + sprintf (procname, "/proc/self/fd/%d", fd); + + ret = readlink (procname, buf, buflen - 1); + if (ret != -1 && buf[0] != '[') + { + buf[ret] = '\0'; + return 0; + } + if (ret == -1 && errno == ENAMETOOLONG) + { + __set_errno (ERANGE); + return ERANGE; + } + + if (fstat64 (fd, &st) < 0) + return errno; + + /* Prepare the result buffer. */ + memcpy (buf, "/dev/pts/", sizeof ("/dev/pts/")); + buflen -= sizeof ("/dev/pts/") - 1; + + if (stat64 (buf, &st1) == 0 && S_ISDIR (st1.st_mode)) + { +#ifdef _STATBUF_ST_RDEV + ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, save, + &dostat); +#else + ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save, + &dostat); +#endif + } + else + { + __set_errno (save); + ret = ENOENT; + } + + if (ret && dostat != -1) + { + buf[sizeof ("/dev/") - 1] = '\0'; + buflen += sizeof ("pts/") - 1; +#ifdef _STATBUF_ST_RDEV + ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, save, + &dostat); +#else + ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save, + &dostat); +#endif + } + + if (ret && dostat != -1) + { + buf[sizeof ("/dev/") - 1] = '\0'; + dostat = 1; +#ifdef _STATBUF_ST_RDEV + ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, + save, &dostat); +#else + ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, + save, &dostat); +#endif + } + + return ret; +} + +weak_alias (__ttyname_r, ttyname_r) |