diff options
Diffstat (limited to 'sysdeps/posix/ttyname_r.c')
| -rw-r--r-- | sysdeps/posix/ttyname_r.c | 128 |
1 files changed, 92 insertions, 36 deletions
diff --git a/sysdeps/posix/ttyname_r.c b/sysdeps/posix/ttyname_r.c index b3a15d13d1..ad747ad35b 100644 --- a/sysdeps/posix/ttyname_r.c +++ b/sysdeps/posix/ttyname_r.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1991, 92, 93, 95, 96, 97 Free Software Foundation, Inc. +/* Copyright (C) 1991, 92, 93, 95, 96, 97, 98 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 @@ -30,58 +30,43 @@ # define MIN(a, b) ((a) < (b) ? (a) : (b)) #endif -/* 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 (fd, buf, buflen) +static const char dev[] = "/dev"; + +static int getttyname_r __P ((int fd, char *buf, size_t buflen, + dev_t mydev, ino_t myino, int save, + int *dostat)) internal_function; + +static int +internal_function +getttyname_r (fd, buf, buflen, mydev, myino, save, dostat) int fd; char *buf; size_t buflen; + dev_t mydev; + ino_t myino; + int save; + int *dostat; { - static const char dev[] = "/dev"; struct stat st; - dev_t mydev; - ino_t myino; DIR *dirstream; struct dirent *d; - int save = errno; - - /* Test for the absolute minimal size. This makes life easier inside - the loop. */ - if (buflen < (int) (sizeof (dev) + 1)) - { - __set_errno (ERANGE); - return ERANGE; - } - - if (!__isatty (fd)) - { - __set_errno (ENOTTY); - return ENOTTY; - } - - if (fstat (fd, &st) < 0) - return errno; - mydev = st.st_dev; - myino = st.st_ino; dirstream = opendir (dev); if (dirstream == NULL) - return errno; - - /* Prepare the result buffer. */ - memcpy (buf, dev, sizeof (dev) - 1); - buf[sizeof (dev) - 1] = '/'; - buflen -= sizeof (dev); + { + *dostat = -1; + return errno; + } while ((d = readdir (dirstream)) != NULL) - if ((ino_t) d->d_fileno == myino) + if ((ino_t) d->d_fileno == myino || *dostat) { char *cp; size_t needed = _D_EXACT_NAMLEN (d) + 1; if (needed > buflen) { + *dostat = -1; (void) closedir (dirstream); __set_errno (ERANGE); return ERANGE; @@ -90,7 +75,13 @@ __ttyname_r (fd, buf, buflen) cp = __stpncpy (&buf[sizeof (dev)], d->d_name, needed); cp[0] = '\0'; - if (stat (buf, &st) == 0 && st.st_dev == mydev) + if (stat (buf, &st) == 0 +#ifdef _STATBUF_ST_RDEV + && S_ISCHR (st.st_mode) && st.st_rdev == mydev +#else + && (ino_t) d->d_fileno == myino && st.st_dev == mydev +#endif + ) { (void) closedir (dirstream); __set_errno (save); @@ -104,4 +95,69 @@ __ttyname_r (fd, buf, buflen) 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 (fd, buf, buflen) + int fd; + char *buf; + size_t buflen; +{ + struct stat st; + 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 < (int) (sizeof (dev) + 1)) + { + __set_errno (ERANGE); + return ERANGE; + } + + if (!__isatty (fd)) + { + __set_errno (ENOTTY); + return ENOTTY; + } + + if (fstat (fd, &st) < 0) + return errno; + + /* Prepare the result buffer. */ + memcpy (buf, dev, sizeof (dev) - 1); + buf[sizeof (dev) - 1] = '/'; + buflen -= sizeof (dev); + +#ifdef _STATBUF_ST_RDEV + ret = getttyname_r (fd, buf, buflen, st.st_rdev, st.st_ino, save, + &dostat); +#else + ret = getttyname_r (fd, buf, buflen, st.st_dev, st.st_ino, save, + &dostat); +#endif + + if (ret && dostat != -1) + { + dostat = 1; +#ifdef _STATBUF_ST_RDEV + ret = getttyname_r (fd, buf, buflen, st.st_rdev, st.st_ino, + save, &dostat); +#else + ret = getttyname_r (fd, buf, buflen, st.st_dev, st.st_ino, + save, &dostat); +#endif + } + + return ret; +} + weak_alias (__ttyname_r, ttyname_r) |