diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/getpt.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/getpt.c | 30 |
1 files changed, 28 insertions, 2 deletions
diff --git a/sysdeps/unix/sysv/linux/getpt.c b/sysdeps/unix/sysv/linux/getpt.c index d2e0f1a7b8..511b9004c0 100644 --- a/sysdeps/unix/sysv/linux/getpt.c +++ b/sysdeps/unix/sysv/linux/getpt.c @@ -20,9 +20,17 @@ #include <errno.h> #include <fcntl.h> #include <stdlib.h> +#include <unistd.h> +#include <paths.h> +#include <sys/statfs.h> + +/* Constant that identifies the `devpts' filesystem. */ +#define DEVPTS_SUPER_MAGIC 0x1cd1 /* Path to the master pseudo terminal cloning device. */ -#define _PATH_DEVPTMX "/dev/ptmx" +#define _PATH_DEVPTMX _PATH_DEV "ptmx" +/* Directory containing the UNIX98 pseudo terminals. */ +#define _PATH_DEVPTS _PATH_DEV "pts" /* Prototype for function that opens BSD-style master pseudo-terminals. */ int __bsd_getpt (void); @@ -38,7 +46,25 @@ __getpt (void) { fd = __open (_PATH_DEVPTMX, O_RDWR); if (fd != -1) - return fd; + { + struct statfs fsbuf; + static int devpts_mounted; + + /* Check that the /dev/pts filesystem is mounted. */ + if (devpts_mounted + || (__statfs (_PATH_DEVPTS, &fsbuf) == 0 + && fsbuf.f_type == DEVPTS_SUPER_MAGIC)) + { + /* Everything is ok. */ + devpts_mounted = 1; + return fd; + } + + /* If /dev/pts is not mounted then the UNIX98 pseudo terminals + are not usable. */ + __close (fd); + have_no_dev_ptmx = 1; + } else { if (errno == ENOENT || errno == ENODEV) |