diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/getpt.c')
-rw-r--r-- | sysdeps/unix/sysv/linux/getpt.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/getpt.c b/sysdeps/unix/sysv/linux/getpt.c new file mode 100644 index 0000000..8eea2ff --- /dev/null +++ b/sysdeps/unix/sysv/linux/getpt.c @@ -0,0 +1,76 @@ +/* Copyright (C) 1998 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <sys/types.h> +#include <fcntl.h> +#include <errno.h> +#include <stdlib.h> + +#include "pty-internal.h" + +/* Per Documentation/devices.txt: pty masters are /dev/pty[p-za-e][0-9a-f]. + These strings are used also in ptsname.c. */ +const char __ptyname1[] = "pqrstuvwxyzabcde"; +const char __ptyname2[] = "0123456789abcdef"; + +/* Open the master side of a pseudoterminal and return its file + descriptor, or -1 on error. Linux version. */ +int +__getpt () +{ + int fd; + const char *i, *j; + static int have_dev_ptmx = 1; + char namebuf[PTYNAMELEN]; + + /* The new way: */ + if (have_dev_ptmx) + { + fd = open ("/dev/ptmx", O_RDWR); + if (fd != -1) + return fd; + else + { + if (errno == ENOENT || errno == ENODEV) + have_dev_ptmx = 0; + else + return -1; + } + } + + /* The old way: */ + strcpy (namebuf, "/dev/pty"); + namebuf[10] = '\0'; + for (i = __ptyname1; *i; ++i) + { + namebuf[8] = *i; + for (j = __ptyname2; *j; ++j) + { + namebuf[9] = *j; + fd = open (namebuf, O_RDWR); + if (fd != -1) + return fd; + if (errno != EIO) + return -1; + } + } + __set_errno (ENFILE); + return -1; +} +weak_alias (__getpt, getpt) |