diff options
Diffstat (limited to 'c/src/exec/libcsupport/src/ttyname.c')
-rw-r--r-- | c/src/exec/libcsupport/src/ttyname.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/c/src/exec/libcsupport/src/ttyname.c b/c/src/exec/libcsupport/src/ttyname.c new file mode 100644 index 0000000000..51b3a5f6aa --- /dev/null +++ b/c/src/exec/libcsupport/src/ttyname.c @@ -0,0 +1,73 @@ +/* + * ttyname_r() - POSIX 1003.1b 4.7.2 - Demetermine Terminal Device Name + * + * $Id$ + */ + +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <dirent.h> +#include <termios.h> +#include <unistd.h> +#include <paths.h> +#include <_syslist.h> +#include <errno.h> + +#include <rtems/posix/seterr.h> + +int ttyname_r( + int fd, + char *name, + int namesize +) +{ + struct stat sb; + struct termios tty; + struct dirent *dirp; + DIR *dp; + struct stat dsb; + char *rval; + + /* Must be a terminal. */ + if (tcgetattr (fd, &tty) < 0) + set_errno_and_return_minus_one(EBADF); + + /* Must be a character device. */ + if (_fstat (fd, &sb) || !S_ISCHR (sb.st_mode)) + set_errno_and_return_minus_one(EBADF); + + if ((dp = opendir (_PATH_DEV)) == NULL) + set_errno_and_return_minus_one(EBADF); + + for (rval = NULL; (dirp = readdir (dp)) != NULL ;) + { + if (dirp->d_ino != sb.st_ino) + continue; + strcpy (name + sizeof (_PATH_DEV) - 1, dirp->d_name); + if (stat (name, &dsb) || sb.st_dev != dsb.st_dev || + sb.st_ino != dsb.st_ino) + continue; + (void) closedir (dp); + rval = name; + break; + } + (void) closedir (dp); + return 0; +} + +static char buf[sizeof (_PATH_DEV) + MAXNAMLEN] = _PATH_DEV; + +/* + * ttyname() - POSIX 1003.1b 4.7.2 - Demetermine Terminal Device Name + */ + +char *ttyname( + int fd +) +{ + if ( !ttyname_r( fd, buf, sizeof(buf) ) ) + return buf; + return NULL; +} + |