diff options
Diffstat (limited to 'mit-pthreads/gen/ttyname.c')
| -rw-r--r-- | mit-pthreads/gen/ttyname.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/mit-pthreads/gen/ttyname.c b/mit-pthreads/gen/ttyname.c new file mode 100644 index 00000000000..b7a04485f79 --- /dev/null +++ b/mit-pthreads/gen/ttyname.c @@ -0,0 +1,147 @@ +/* + * Copyright (c) 1988 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 5.10 (Berkeley) 5/6/91"; +#endif /* LIBC_SCCS and not lint */ + +#include "config.h" +#include <pthread.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <dirent.h> +#include <unistd.h> +#include <string.h> +#include <stdlib.h> + +static pthread_mutex_t ttyname_lock = PTHREAD_MUTEX_INITIALIZER; +static pthread_key_t ttyname_key; +static int ttyname_init = 0; +extern void free(); + +char * __ttyname_r_basic(int fd, char * buf, size_t len) +{ + register struct dirent *dirp; + register DIR *dp; + struct stat dsb; + struct stat sb; + char * rval; + int minlen; + + rval = NULL; + + /* Must be a terminal. */ + if (! isatty_basic(fd)) + return(rval); + /* Must be a character device. */ + if (machdep_sys_fstat(fd, &sb) || !S_ISCHR(sb.st_mode)) + return(rval); + /* Must have enough room */ + if (len <= sizeof(_PATH_PTY)) + return(rval); + + if ((dp = opendir(_PATH_PTY)) != NULL) { + memcpy(buf, _PATH_PTY, sizeof(_PATH_PTY)); + for (rval = NULL; dirp = readdir(dp);) { + if (dirp->d_fileno != sb.st_ino) + continue; + minlen = (len - (sizeof(_PATH_PTY) - 1)) < (dirp->d_namlen + 1) ? + (len - (sizeof(_PATH_PTY) - 1)) : (dirp->d_namlen + 1); + memcpy (buf + sizeof(_PATH_PTY) - 1, dirp->d_name, minlen); + if (stat(buf, &dsb) || sb.st_dev != dsb.st_dev || + sb.st_ino != dsb.st_ino) + continue; + rval = buf; + break; + } + (void)closedir(dp); + } + return(rval); +} + +char * __ttyname_basic(int fd) +{ + char *buf; + + pthread_mutex_lock (&ttyname_lock); + if (ttyname_init == 0) { + if (pthread_key_create(&ttyname_key, free)) { + pthread_mutex_unlock (&ttyname_lock); + return(NULL); + } + ttyname_init = 1; + } + pthread_mutex_unlock (&ttyname_lock); + + /* Must have thread specific data field to put data */ + if ((buf = pthread_getspecific(ttyname_key)) == NULL) { + if (buf = malloc(sizeof(_PATH_PTY) + MAXNAMLEN)) { + if (pthread_setspecific(ttyname_key, buf) != OK) { + free(buf); + return(NULL); + } + } else { + return(NULL); + } + } + return(__ttyname_r_basic(fd, buf, sizeof(_PATH_PTY) + MAXNAMLEN)); +} + +char * ttyname_r(int fd, char * buf, size_t len) +{ + char * ret; + + if (fd_lock(fd, FD_READ) == OK) { + ret = __ttyname_r_basic(fd_table[fd]->fd.i, buf, len); + fd_unlock(fd, FD_READ); + } else { + ret = NULL; + } + return(ret); +} + +char * ttyname(int fd) +{ + char * ret; + + if (fd_lock(fd, FD_READ) == OK) { + ret = __ttyname_basic(fd_table[fd]->fd.i); + fd_unlock(fd, FD_READ); + } else { + ret = NULL; + } + return(ret); +} + + |