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sigaltstack01.c
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sigaltstack01.c
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/*
*
* Copyright (c) International Business Machines Corp., 2001
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* Test Name: sigalstack01
*
* Test Description:
* Send a signal using the main stack. While executing the signal handler
* compare a variable's address lying on the main stack with the stack
* boundaries returned by sigaltstack().
*
* Expected Result:
* sigaltstack() should succeed to get/set signal alternate stack context.
*
* Algorithm:
* Setup:
* Setup signal handling.
* Pause for SIGUSR1 if option specified.
*
* Test:
* Loop if the proper options are given.
* Execute system call
* Check return code, if system call failed (return=-1)
* Log the errno and Issue a FAIL message.
* Otherwise,
* Verify the Functionality of system call
* if successful,
* Issue Functionality-Pass message.
* Otherwise,
* Issue Functionality-Fail message.
* Cleanup:
* Print errno log and/or timing stats if options given
*
* Usage: <for command-line>
* sigaltstack01 [-c n] [-e] [-f] [-i n] [-I x] [-p x] [-t]
* where, -c n : Run n copies concurrently.
* -e : Turn on errno logging.
* -f : Turn off functionality Testing.
* -i n : Execute test n times.
* -I x : Execute test for x seconds.
* -P x : Pause for x seconds between iterations.
* -t : Turn on syscall timing.
*
* History
* 07/2001 John George
* -Ported
*
* Restrictions:
* This test should be run by 'super-user' (root) only and must run from
* shell which sets up for test.
*
*/
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <signal.h>
#include <string.h>
#include <ucontext.h>
#include <errno.h>
#include "test.h"
char *TCID = "sigaltstack01";
int TST_TOTAL = 1;
void *addr, *main_stk; /* address of main stack for signal */
int got_signal = 0;
pid_t my_pid; /* test process id */
stack_t sigstk, osigstk; /* signal stack storing struct. */
struct sigaction act, oact; /* sigaction() struct. */
void setup(void); /* Main setup function of test */
void cleanup(void); /* cleanup function for the test */
void sig_handler(int); /* signal catching function */
int main(int ac, char **av)
{
int lc;
void *alt_stk; /* address of alternate stack for signal */
tst_parse_opts(ac, av, NULL, NULL);
setup();
for (lc = 0; TEST_LOOPING(lc); lc++) {
tst_count = 0;
/* Call sigaltstack() to set up an alternate stack */
sigstk.ss_size = SIGSTKSZ;
sigstk.ss_flags = 0;
TEST(sigaltstack(&sigstk, &osigstk));
if (TEST_RETURN == -1) {
tst_resm(TFAIL,
"sigaltstack() Failed, errno=%d : %s",
TEST_ERRNO, strerror(TEST_ERRNO));
} else {
/* Set up the signal handler for 'SIGUSR1' */
act.sa_flags = SA_ONSTACK;
act.sa_handler = (void (*)())sig_handler;
if ((sigaction(SIGUSR1, &act, &oact)) == -1) {
tst_brkm(TFAIL, cleanup, "sigaction() "
"fails to trap signal "
"delivered on alt. stack, "
"error=%d", errno);
}
/* Deliver signal onto the alternate stack */
kill(my_pid, SIGUSR1);
/* wait till the signal arrives */
while (!got_signal) ;
got_signal = 0;
alt_stk = addr;
/*
* First,
* Check that alt_stk is within the
* alternate stk boundaries
*
* Second,
* Check that main_stk is outside the
* alternate stk boundaries.
*/
if ((alt_stk < sigstk.ss_sp) &&
(alt_stk > (sigstk.ss_sp + SIGSTKSZ))) {
tst_resm(TFAIL,
"alt. stack is not within the "
"alternate stk boundaries");
} else if ((main_stk >= sigstk.ss_sp) &&
(main_stk <=
(sigstk.ss_sp + SIGSTKSZ))) {
tst_resm(TFAIL,
"main stk. not outside the "
"alt. stack boundaries");
} else {
tst_resm(TPASS,
"Functionality of "
"sigaltstack() successful");
}
}
tst_count++; /* incr. TEST_LOOP counter */
}
cleanup();
tst_exit();
}
/*
* void
* setup() - performs all ONE TIME setup for this test.
* Capture SIGUSR1 on the main stack.
* send the signal 'SIGUSER1' to the process.
* wait till the signal arrives.
* Allocate memory for the alternative stack.
*/
void setup(void)
{
tst_sig(FORK, DEF_HANDLER, cleanup);
TEST_PAUSE;
/* Get the process id of test process */
my_pid = getpid();
/* Capture SIGUSR1 on the main stack */
act.sa_handler = (void (*)(int))sig_handler;
if ((sigaction(SIGUSR1, &act, &oact)) == -1) {
tst_brkm(TFAIL, cleanup,
"sigaction() fails in setup, errno=%d", errno);
}
/* Send the signal to the test process */
kill(my_pid, SIGUSR1);
/* Wait till the signal arrives */
while (!got_signal) ;
got_signal = 0;
main_stk = addr;
/* Allocate memory for the alternate stack */
if ((sigstk.ss_sp = malloc(SIGSTKSZ)) == NULL) {
tst_brkm(TFAIL, cleanup,
"could not allocate memory for the alternate stack");
}
}
/*
* void
* sig_handler() - signal catching function.
* This functions is called when the signal 'SIGUSR1' is delivered to
* the test process and trapped by sigaction().
*
* This function updates 'addr' variable and sets got_signal value.
*/
void sig_handler(int n)
{
int i;
(void) n;
addr = &i;
got_signal = 1;
}
/*
* void
* cleanup() - performs all ONE TIME cleanup for this test at
* completion or premature exit.
* Free the memory allocated for alternate stack.
*/
void cleanup(void)
{
free(sigstk.ss_sp);
}