| /* |
| * |
| * 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; |
| const char *msg; |
| void *alt_stk; /* address of alternate stack for signal */ |
| |
| msg = parse_opts(ac, av, NULL, NULL); |
| if (msg != NULL) { |
| tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg); |
| |
| } |
| |
| 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); |
| |
| } |