minix/test/test77.c

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/* Tests for opening/closing pseudo terminals - by D.C. van Moolenbroek */
/* This test needs to be run as root; otherwise, openpty() won't work. */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <termios.h>
#include <sys/wait.h>
#include <sys/syslimits.h>
#include <paths.h>
#include <fcntl.h>
#include <util.h>
#define ITERATIONS 10
#include "common.h"
static int sighups; /* number of SIGHUP signals received */
/*
* Signal handler for SIGHUP and SIGUSR1.
*/
void
signal_handler(int sig)
{
if (sig == SIGHUP)
sighups++;
}
/*
* Set the slave side of the pseudo terminal to raw mode. This simplifies
* testing communication.
*/
static void
make_raw(int slavefd)
{
struct termios tios;
if (tcgetattr(slavefd, &tios) < 0) e(100);
cfmakeraw(&tios);
if (tcsetattr(slavefd, TCSANOW, &tios) < 0) e(101);
}
/*
* See if the given pseudo terminal can successfully perform basic
* communication between master and slave.
*/
static void
test_comm(int masterfd, int slavefd)
{
char c;
make_raw(slavefd);
c = 'A';
if (write(masterfd, &c, sizeof(c)) != sizeof(c)) e(200);
if (read(slavefd, &c, sizeof(c)) != sizeof(c)) e(201);
if (c != 'A') e(202);
c = 'B';
if (write(slavefd, &c, sizeof(c)) != sizeof(c)) e(203);
if (read(masterfd, &c, sizeof(c)) != sizeof(c)) e(204);
if (c != 'B') e(205);
c = 'C';
if (write(masterfd, &c, sizeof(c)) != sizeof(c)) e(206);
if (read(slavefd, &c, sizeof(c)) != sizeof(c)) e(207);
if (c != 'C') e(208);
c = 'D';
if (write(slavefd, &c, sizeof(c)) != sizeof(c)) e(209);
if (read(masterfd, &c, sizeof(c)) != sizeof(c)) e(210);
if (c != 'D') e(211);
}
/*
* Get device node names for the master and slave end of a free pseudo
* terminal. We don't want to replicate the entire openpty(3) logic here, so
* start by letting openpty(3) do the work for us. We make the assumption that
* nobody snatches the pair while we are running.
*/
static void
get_names(char pname[PATH_MAX], char tname[PATH_MAX])
{
int len, masterfd, slavefd;
if (openpty(&masterfd, &slavefd, tname, NULL, NULL) < 0) e(300);
/*
* openpty(3) gives us only the slave name, but we also need the master
* name.
*/
strlcpy(pname, tname, PATH_MAX);
len = strlen(_PATH_DEV);
if (strncmp(pname, _PATH_DEV, len)) e(301);
/* If this fails, this test needs to be updated. */
if (pname[len] != 't') e(302);
pname[len] = 'p';
test_comm(masterfd, slavefd);
if (close(masterfd) < 0) e(303);
if (close(slavefd) < 0) e(304);
}
/*
* Test various orders of opening and closing the master and slave sides of a
* pseudo terminal, as well as opening/closing one side without ever opening
* the other.
*/
static void
test77a(void)
{
struct sigaction act, oact;
char pname[PATH_MAX], tname[PATH_MAX];
int masterfd, slavefd;
subtest = 1;
/* We do not want to get SIGHUP signals in this test. */
memset(&act, 0, sizeof(act));
act.sa_handler = SIG_IGN;
if (sigaction(SIGHUP, &act, &oact) < 0) e(1);
/* Get master and slave device names for a free pseudo terminal. */
get_names(pname, tname);
/* Try opening and then closing the master. */
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(2);
if (close(masterfd) < 0) e(3);
/* Now see if we can reopen the master as well as the slave. */
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(4);
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(5);
test_comm(masterfd, slavefd);
/* In the meantime, test different closing orders. This is order A. */
if (close(slavefd) < 0) e(6);
if (close(masterfd) < 0) e(7);
/* Now try opening the pair again. */
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(8);
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(9);
test_comm(masterfd, slavefd);
if (close(slavefd) < 0) e(10);
/*
* Try reopening the slave after closing it. It is not very important
* that this works, but the TTY driver should currently support it.
*/
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(11);
test_comm(masterfd, slavefd);
/* This is closing order B. This may or may not cause a SIGHUP. */
if (close(masterfd) < 0) e(12);
if (close(slavefd) < 0) e(13);
/* Try the normal open procedure. */
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(14);
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(15);
test_comm(masterfd, slavefd);
if (close(slavefd) < 0) e(16);
if (close(masterfd) < 0) e(17);
/* Try reopening and closing the slave, without opening the master. */
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(18);
if (close(slavefd) < 0) e(19);
/* Again, try the normal open procedure. */
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(20);
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(21);
test_comm(masterfd, slavefd);
if (close(slavefd) < 0) e(22);
if (close(masterfd) < 0) e(23);
/* Finally, try opening the slave first. */
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(24);
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(25);
test_comm(masterfd, slavefd);
if (close(slavefd) < 0) e(26);
if (close(masterfd) < 0) e(27);
if (sigaction(SIGHUP, &oact, NULL) < 0) e(28);
}
/*
* Test opening a single side multiple times.
*/
static void
test77b(void)
{
char pname[PATH_MAX], tname[PATH_MAX];
int masterfd, slavefd, extrafd;
subtest = 2;
/* Get master and slave device names for a free pseudo terminal. */
get_names(pname, tname);
/* It must not be possible to open the master multiple times. */
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(1);
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(2);
test_comm(masterfd, slavefd);
if ((extrafd = open(pname, O_RDWR | O_NOCTTY)) >= 0) e(3);
if (errno != EIO) e(4);
test_comm(masterfd, slavefd);
if (close(slavefd) < 0) e(5);
if (close(masterfd) < 0) e(6);
/* The slave can be opened multiple times, though. */
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(7);
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(8);
test_comm(masterfd, slavefd);
if ((extrafd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(9);
test_comm(masterfd, extrafd);
test_comm(masterfd, slavefd);
if (close(slavefd) < 0) e(10);
if (close(extrafd) < 0) e(11);
if (close(masterfd) < 0) e(12);
}
/*
* Test communication on half-open pseudo terminals.
*/
static void
test77c(void)
{
struct sigaction act, oact;
char pname[PATH_MAX], tname[PATH_MAX];
int masterfd, slavefd;
char c;
subtest = 3;
/* We do not want to get SIGHUP signals in this test. */
memset(&act, 0, sizeof(act));
act.sa_handler = SIG_IGN;
if (sigaction(SIGHUP, &act, &oact) < 0) e(1);
/* Get master and slave device names for a free pseudo terminal. */
get_names(pname, tname);
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(2);
/* Writes to the master should be buffered until there is a slave. */
c = 'E';
if (write(masterfd, &c, sizeof(c)) != sizeof(c)) e(3);
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(4);
make_raw(slavefd);
if (read(slavefd, &c, sizeof(c)) != sizeof(c)) e(5);
if (c != 'E') e(6);
/* Discard the echo on the master. */
if (tcflush(slavefd, TCOFLUSH) != 0) e(7);
test_comm(masterfd, slavefd);
if (close(slavefd) < 0) e(8);
/* Writes to the master after the slave has been closed should fail. */
if (write(masterfd, &c, sizeof(c)) >= 0) e(9);
if (errno != EIO) e(10);
if (close(masterfd) < 0) e(11);
/* Writes to the slave should be buffered until there is a master. */
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(12);
make_raw(slavefd);
c = 'F';
if (write(slavefd, &c, sizeof(c)) != sizeof(c)) e(13);
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(14);
if (read(masterfd, &c, sizeof(c)) != sizeof(c)) e(15);
if (c != 'F') e(16);
test_comm(masterfd, slavefd);
if (close(masterfd) < 0) e(17);
if (write(slavefd, &c, sizeof(c)) >= 0) e(18);
if (errno != EIO) e(19);
if (close(slavefd) < 0) e(20);
if (sigaction(SIGHUP, &oact, NULL) < 0) e(21);
}
/*
* Test opening the slave side with and without the O_NOCTTY flag.
*/
static void
test77d(void)
{
char pname[PATH_MAX], tname[PATH_MAX];
int masterfd, slavefd;
subtest = 4;
/* Get master and slave device names for a free pseudo terminal. */
get_names(pname, tname);
/* Make ourselves process group leader if we aren't already. */
(void) setsid();
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(1);
/*
* Opening the slave with O_NOCTTY should not change its controlling
* terminal.
*/
switch (fork()) {
case 0:
if (setsid() < 0) e(2);
if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(3);
if (open("/dev/tty", O_RDWR) >= 0) e(4);
if (errno != ENXIO) e(5);
exit(0);
case -1:
e(6);
default:
break;
}
if (wait(NULL) <= 0) e(7);
if (close(masterfd) < 0) e(8);
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(9);
/*
* Opening the slave without O_NOCTTY should change its controlling
* terminal, though.
*/
switch (fork()) {
case 0:
if (setsid() < 0) e(10);
if ((slavefd = open(tname, O_RDWR)) < 0) e(11);
if (open("/dev/tty", O_RDWR) < 0) e(12);
exit(0);
case -1:
e(13);
default:
break;
}
if (wait(NULL) <= 0) e(14);
if (close(masterfd) < 0) e(15);
}
/*
* Test receiving of SIGHUP on master hang-up. All of the tests so far have
* ignored SIGHUP, and probably would not have received one anyway, since the
* process was not its own session leader. Time to test this aspect.
*/
static void
test77e(void)
{
struct sigaction act, hup_oact, usr_oact;
sigset_t set, oset;
char pname[PATH_MAX], tname[PATH_MAX];
int masterfd, slavefd;
subtest = 5;
/* Get master and slave device names for a free pseudo terminal. */
get_names(pname, tname);
memset(&act, 0, sizeof(act));
act.sa_handler = signal_handler;
if (sigaction(SIGHUP, &act, &hup_oact) < 0) e(1);
memset(&act, 0, sizeof(act));
act.sa_handler = signal_handler;
if (sigaction(SIGUSR1, &act, &usr_oact) < 0) e(2);
sigemptyset(&set);
sigaddset(&set, SIGHUP);
sigaddset(&set, SIGUSR1);
if (sigprocmask(SIG_BLOCK, &set, &oset) < 0) e(3);
sighups = 0;
/* Make ourselves process group leader if we aren't already. */
(void) setsid();
if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(4);
switch (fork()) {
case 0:
if (close(masterfd) < 0) e(5);
/* Become session leader. */
if (setsid() < 0) e(6);
if ((slavefd = open(tname, O_RDWR)) < 0) e(7);
/* Tell the parent we are ready. */
kill(getppid(), SIGUSR1);
/* We should now get a SIGHUP. */
set = oset;
if (sigsuspend(&set) >= 0) e(8);
if (sighups != 1) e(9);
exit(0);
case -1:
e(10);
default:
break;
}
/* Wait for SIGUSR1 from the child. */
set = oset;
if (sigsuspend(&set) >= 0) e(11);
/* Closing the master should now raise a SIGHUP signal in the child. */
if (close(masterfd) < 0) e(12);
if (wait(NULL) <= 0) e(13);
if (sigprocmask(SIG_SETMASK, &oset, NULL) < 0) e(14);
if (sigaction(SIGHUP, &hup_oact, NULL) < 0) e(15);
if (sigaction(SIGUSR1, &usr_oact, NULL) < 0) e(16);
}
int
main(int argc, char **argv)
{
int i, m;
start(77);
if (argc == 2)
m = atoi(argv[1]);
else
m = 0xFF;
for (i = 0; i < ITERATIONS; i++) {
if (m & 0x01) test77a();
if (m & 0x02) test77b();
if (m & 0x04) test77c();
if (m & 0x08) test77d();
if (m & 0x10) test77e();
}
quit();
}