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/* Test of ptsname(3).
Copyright (C) 2010-2022 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#include <stdlib.h>
#include "signature.h"
SIGNATURE_CHECK (ptsname, char *, (int));
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include "same-inode.h"
#include "macros.h"
/* Compare two slave names.
On some systems, there are hard links in the /dev/ directory.
For example, on OSF/1 5.1,
/dev/ttyp0 == /dev/pts/0
/dev/ttyp9 == /dev/pts/9
/dev/ttypa == /dev/pts/10
/dev/ttype == /dev/pts/14
*/
static int
same_slave (const char *slave_name1, const char *slave_name2)
{
struct stat statbuf1;
struct stat statbuf2;
return (strcmp (slave_name1, slave_name2) == 0
|| (stat (slave_name1, &statbuf1) >= 0
&& stat (slave_name2, &statbuf2) >= 0
&& SAME_INODE (statbuf1, statbuf2)));
}
int
main (void)
{
#if HAVE_DECL_ALARM
/* Declare failure if test takes too long, by using default abort
caused by SIGALRM. */
# if defined _AIX
int alarm_value = 20;
# else
int alarm_value = 5;
# endif
signal (SIGALRM, SIG_DFL);
alarm (alarm_value);
#endif
{
char *result;
errno = 0;
result = ptsname (-1);
ASSERT (result == NULL);
ASSERT (errno == EBADF
|| errno == ENOTTY /* seen on glibc */
);
}
{
int fd;
char *result;
/* Open the controlling tty of the current process. */
fd = open ("/dev/tty", O_RDONLY);
if (fd < 0)
{
fprintf (stderr, "Skipping test: cannot open controlling tty\n");
return 77;
}
result = ptsname (fd);
/* The result is usually NULL, because /dev/tty is a slave, not a
master. */
if (result != NULL)
{
ASSERT (memcmp (result, "/dev/", 5) == 0);
}
close (fd);
}
#if defined __sun || defined __DragonFly__
/* Solaris has BSD-style /dev/pty[p-r][0-9a-f] files, but the function
ptsname() does not work on them.
DragonFly BSD has only /dev/ptmx. */
{
int fd;
char *result;
/* Open the controlling tty of the current process. */
fd = open ("/dev/ptmx", O_RDWR | O_NOCTTY);
if (fd < 0)
{
fprintf (stderr, "Skipping test: cannot open pseudo-terminal\n");
return 77;
}
result = ptsname (fd);
ASSERT (result != NULL);
ASSERT (memcmp (result, "/dev/pts/", 9) == 0);
close (fd);
}
#elif defined _AIX
/* AIX has BSD-style /dev/ptyp[0-9a-f] files, and the function ptsname()
produces the corresponding /dev/ttyp[0-9a-f] file for each. But opening
such a pty causes the process to hang in a state where it does not even
react to the SIGALRM signal for N * 15 seconds, where N is the number of
opened ptys, either in the close (fd) call or - when this close (fd) call
is commented out - at the process exit.
So, better don't use these BSD-style ptys. The modern way to open a pty
is to go through /dev/ptc. */
{
int fd;
char *result;
/* Open a pty master. */
fd = open ("/dev/ptc", O_RDWR | O_NOCTTY);
if (fd < 0)
{
fprintf (stderr, "Skipping test: cannot open pseudo-terminal\n");
return 77;
}
result = ptsname (fd);
ASSERT (result != NULL);
ASSERT (memcmp (result, "/dev/pts/", 9) == 0);
/* This close (fd) call takes 15 seconds. It would be interruptible by the
SIGALRM timer, but then this test would report failure. */
close (fd);
}
#else
/* Try various master names of Mac OS X: /dev/pty[p-w][0-9a-f] */
{
int char1;
int char2;
for (char1 = 'p'; char1 <= 'w'; char1++)
for (char2 = '0'; char2 <= 'f'; (char2 == '9' ? char2 = 'a' : char2++))
{
char master_name[32];
int fd;
sprintf (master_name, "/dev/pty%c%c", char1, char2);
fd = open (master_name, O_RDONLY);
if (fd >= 0)
{
char *result;
char slave_name[32];
result = ptsname (fd);
ASSERT (result != NULL);
sprintf (slave_name, "/dev/tty%c%c", char1, char2);
ASSERT (same_slave (result, slave_name));
close (fd);
}
}
}
/* Try various master names of *BSD: /dev/pty[p-sP-S][0-9a-v] */
{
int upper;
int char1;
int char2;
for (upper = 0; upper <= 1; upper++)
for (char1 = (upper ? 'P' : 'p'); char1 <= (upper ? 'S' : 's'); char1++)
for (char2 = '0'; char2 <= 'v'; (char2 == '9' ? char2 = 'a' : char2++))
{
char master_name[32];
int fd;
sprintf (master_name, "/dev/pty%c%c", char1, char2);
fd = open (master_name, O_RDONLY);
if (fd >= 0)
{
char *result;
char slave_name[32];
result = ptsname (fd);
ASSERT (result != NULL);
sprintf (slave_name, "/dev/tty%c%c", char1, char2);
ASSERT (same_slave (result, slave_name));
close (fd);
}
}
}
#endif
return 0;
}
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