diff options
Diffstat (limited to 'lib/libc/gen/ttyname.c')
-rw-r--r-- | lib/libc/gen/ttyname.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/lib/libc/gen/ttyname.c b/lib/libc/gen/ttyname.c new file mode 100644 index 0000000..a21b77f --- /dev/null +++ b/lib/libc/gen/ttyname.c @@ -0,0 +1,110 @@ +/* + * 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. + * 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/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include "namespace.h" +#include <sys/types.h> +#include <sys/ioctl.h> +#include <sys/filio.h> +#include <fcntl.h> +#include <dirent.h> +#include <stdlib.h> +#include <termios.h> +#include <unistd.h> +#include <string.h> +#include <paths.h> +#include <errno.h> +#include "reentrant.h" +#include "un-namespace.h" + +#include "libc_private.h" + +static char ttyname_buf[sizeof(_PATH_DEV) + MAXNAMLEN]; + +static once_t ttyname_init_once = ONCE_INITIALIZER; +static thread_key_t ttyname_key; +static int ttyname_keycreated = 0; + +int +ttyname_r(int fd, char *buf, size_t len) +{ + size_t used; + + *buf = '\0'; + + /* Must be a terminal. */ + if (!isatty(fd)) + return (ENOTTY); + /* Must have enough room */ + if (len <= sizeof(_PATH_DEV)) + return (ERANGE); + + strcpy(buf, _PATH_DEV); + used = strlen(buf); + if (fdevname_r(fd, buf + used, len - used) == NULL) + return (ENOTTY); + return (0); +} + +static void +ttyname_keycreate(void) +{ + ttyname_keycreated = (thr_keycreate(&ttyname_key, free) == 0); +} + +char * +ttyname(int fd) +{ + char *buf; + + if (thr_main() != 0) + buf = ttyname_buf; + else { + if (thr_once(&ttyname_init_once, ttyname_keycreate) != 0 || + !ttyname_keycreated) + return (NULL); + if ((buf = thr_getspecific(ttyname_key)) == NULL) { + if ((buf = malloc(sizeof ttyname_buf)) == NULL) + return (NULL); + if (thr_setspecific(ttyname_key, buf) != 0) { + free(buf); + return (NULL); + } + } + } + + if (ttyname_r(fd, buf, sizeof ttyname_buf) != 0) + return (NULL); + return (buf); +} |