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author | rgrimes <rgrimes@FreeBSD.org> | 1994-05-27 05:00:24 +0000 |
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committer | rgrimes <rgrimes@FreeBSD.org> | 1994-05-27 05:00:24 +0000 |
commit | be22b15ae2ff8d7fe06b6e14fddf0c5b444a95da (patch) | |
tree | a18a706dffa5baf86a3b12bbfb4f81caa097f349 /lib/libc/gen/ttyname.c | |
parent | 2a27bd86e6002c871e3b5561a5334653bb222a77 (diff) | |
download | FreeBSD-src-be22b15ae2ff8d7fe06b6e14fddf0c5b444a95da.zip FreeBSD-src-be22b15ae2ff8d7fe06b6e14fddf0c5b444a95da.tar.gz |
BSD 4.4 Lite Lib Sources
Diffstat (limited to 'lib/libc/gen/ttyname.c')
-rw-r--r-- | lib/libc/gen/ttyname.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/lib/libc/gen/ttyname.c b/lib/libc/gen/ttyname.c new file mode 100644 index 0000000..2f47bd6 --- /dev/null +++ b/lib/libc/gen/ttyname.c @@ -0,0 +1,112 @@ +/* + * Copyright (c) 1988, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)ttyname.c 8.2 (Berkeley) 1/27/94"; +#endif /* LIBC_SCCS and not lint */ + +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <dirent.h> +#include <sgtty.h> +#include <db.h> +#include <string.h> +#include <paths.h> + +static char buf[sizeof(_PATH_DEV) + MAXNAMLEN] = _PATH_DEV; +static char *oldttyname __P((int, struct stat *)); + +char * +ttyname(fd) + int fd; +{ + struct stat sb; + struct sgttyb ttyb; + DB *db; + DBT data, key; + struct { + mode_t type; + dev_t dev; + } bkey; + + /* Must be a terminal. */ + if (ioctl(fd, TIOCGETP, &ttyb) < 0) + return (NULL); + /* Must be a character device. */ + if (fstat(fd, &sb) || !S_ISCHR(sb.st_mode)) + return (NULL); + + if (db = dbopen(_PATH_DEVDB, O_RDONLY, 0, DB_HASH, NULL)) { + memset(&bkey, 0, sizeof(bkey)); + bkey.type = S_IFCHR; + bkey.dev = sb.st_rdev; + key.data = &bkey; + key.size = sizeof(bkey); + if (!(db->get)(db, &key, &data, 0)) { + bcopy(data.data, + buf + sizeof(_PATH_DEV) - 1, data.size); + (void)(db->close)(db); + return (buf); + } + (void)(db->close)(db); + } + return (oldttyname(fd, &sb)); +} + +static char * +oldttyname(fd, sb) + int fd; + struct stat *sb; +{ + register struct dirent *dirp; + register DIR *dp; + struct stat dsb; + + if ((dp = opendir(_PATH_DEV)) == NULL) + return (NULL); + + while (dirp = readdir(dp)) { + if (dirp->d_fileno != sb->st_ino) + continue; + bcopy(dirp->d_name, buf + sizeof(_PATH_DEV) - 1, + dirp->d_namlen + 1); + if (stat(buf, &dsb) || sb->st_dev != dsb.st_dev || + sb->st_ino != dsb.st_ino) + continue; + (void)closedir(dp); + return (buf); + } + (void)closedir(dp); + return (NULL); +} |