273 lines
6.5 KiB
C
273 lines
6.5 KiB
C
/*
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*
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* Copyright (c) International Business Machines Corp., 2001
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* NAME
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* sigaction01.c
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*
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* DESCRIPTION
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* Test some features of sigaction (see below for more details)
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*
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* ALGORITHM
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* Use sigaction(2) to set a signal handler for SIGUSR1 with a certain
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* set of flags, set a global variable indicating the test case, and
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* finally send the signal to ourselves, causing the signal handler to
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* run. The signal handler then checks the signal handler to run. The
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* signal handler then checks certain conditions based on the test case
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* number.
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* There are 4 test cases:
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*
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* 1) Set SA_RESETHAND and SA_SIGINFO. When the handler runs,
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* SA_SIGINFO should be set.
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*
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* 2) Set SA_RESETHAND. When the handler runs, SIGUSR1 should be
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* masked (SA_RESETHAND makes sigaction behave as if SA_NODEFER was
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* not set).
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*
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* 3) Same as case #2, but when the handler is established, sa_mask is
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* set to include SIGUSR1. Ensure that SIGUSR1 is indeed masked even if
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* SA_RESETHAND is set.
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*
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* 4) A signal generated from an interface or condition that does not
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* provide siginfo (such as pthread_kill(3)) should invoke the handler
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* with a non-NULL siginfo pointer.
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*
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* USAGE: <for command-line>
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* sigaction01 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
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* where, -c n : Run n copies concurrently.
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* -f : Turn off functionality Testing.
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* -i n : Execute test n times.
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* -I x : Execute test for x seconds.
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* -P x : Pause for x seconds between iterations.
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* -t : Turn on syscall timing.
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*
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* HISTORY
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* 07/2001 Ported by Wayne Boyer
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*
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* RESTRICTIONS
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* NONE
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*/
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#include <pthread.h>
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#include <signal.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "test.h"
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void setup();
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void cleanup();
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char *TCID = "sigaction01";
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int TST_TOTAL = 4;
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volatile sig_atomic_t testcase_no;
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volatile sig_atomic_t pass;
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/*
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* handler()
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*
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* A signal handler that understands which test case is currently
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* being executed and compares the current conditions to the ones it
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* expects (based on the test case number).
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*/
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void handler(int sig, siginfo_t * sip, void *ucp)
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{
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struct sigaction oact;
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int err;
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sigset_t nmask, omask;
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/*
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* Get sigaction setting
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*/
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err = sigaction(SIGUSR1, NULL, &oact);
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if (err == -1) {
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perror("sigaction");
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return;
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}
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/*
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* Get current signal mask
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*/
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sigemptyset(&nmask);
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sigemptyset(&omask);
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err = sigprocmask(SIG_BLOCK, &nmask, &omask);
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if (err == -1) {
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perror("sigprocmask");
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tst_resm(TWARN, "sigprocmask() failed");
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return;
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}
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switch (testcase_no) {
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case 1:
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/*
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* SA_RESETHAND and SA_SIGINFO were set. SA_SIGINFO should
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* be clear in Linux. In Linux kernel, SA_SIGINFO is not
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* cleared in psig().
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*/
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if (!(oact.sa_flags & SA_SIGINFO)) {
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tst_resm(TFAIL, "SA_RESETHAND should not "
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"cause SA_SIGINFO to be cleared, but it was.");
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return;
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}
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if (sip == NULL) {
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tst_resm(TFAIL, "siginfo should not be NULL");
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return;
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}
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tst_resm(TPASS, "SA_RESETHAND did not "
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"cause SA_SIGINFO to be cleared");
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break;
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case 2:
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/*
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* In Linux, SA_RESETHAND doesn't imply SA_NODEFER; sig
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* should not be masked. The testcase should pass if
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* SA_NODEFER is not masked, ie. if SA_NODEFER is a member
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* of the signal list
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*/
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if (sigismember(&omask, sig) == 0) {
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tst_resm(TFAIL, "SA_RESETHAND should cause sig to"
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"be masked when the handler executes.");
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return;
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}
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tst_resm(TPASS, "SA_RESETHAND was masked when handler "
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"executed");
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break;
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case 3:
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/*
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* SA_RESETHAND implies SA_NODEFER unless sa_mask already
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* included sig.
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*/
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if (!sigismember(&omask, sig)) {
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tst_resm(TFAIL, "sig should continue to be masked"
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"because sa_mask originally contained sig.");
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return;
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}
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tst_resm(TPASS, "sig has been masked "
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"because sa_mask originally contained sig");
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break;
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case 4:
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/*
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* A signal generated from a mechanism that does not provide
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* siginfo should invoke the handler with a non-NULL siginfo
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* pointer.
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*/
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if (sip == NULL) {
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tst_resm(TFAIL, "siginfo pointer should not be NULL");
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return;
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}
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tst_resm(TPASS, "siginfo pointer non NULL");
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break;
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default:
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tst_resm(TFAIL, "invalid test case number: %d", testcase_no);
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exit(1);
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}
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}
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/*
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* set_handler()
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*
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* Establish a signal handler for SIGUSR1 with the specified flags and
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* signal to mask while the handler executes.
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*/
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int set_handler(int flags, int sig_to_mask)
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{
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struct sigaction sa;
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sa.sa_sigaction = handler;
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sa.sa_flags = flags;
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sigemptyset(&sa.sa_mask);
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sigaddset(&sa.sa_mask, sig_to_mask);
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TEST(sigaction(SIGUSR1, &sa, NULL));
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if (TEST_RETURN != 0) {
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perror("sigaction");
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tst_resm(TFAIL, "call failed unexpectedly");
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return 1;
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}
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return 0;
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}
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/*
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* setup() - performs all ONE TIME setup for this test.
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*/
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void setup(void)
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{
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TEST_PAUSE;
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}
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/*
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* cleanup() - performs all ONE TIME cleanup for this test at
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* completion or premature exit.
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*/
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void cleanup(void)
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{
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}
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int main(int ac, char **av)
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{
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int lc;
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int i;
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int test_flags[] = { SA_RESETHAND | SA_SIGINFO, SA_RESETHAND,
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SA_RESETHAND | SA_SIGINFO, SA_RESETHAND | SA_SIGINFO
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};
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tst_parse_opts(ac, av, NULL, NULL);
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setup();
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for (lc = 0; TEST_LOOPING(lc); lc++) {
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/* reset tst_count in case we are looping */
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tst_count = 0;
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testcase_no = 0;
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for (i = 0; i < TST_TOTAL; i++) {
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if (set_handler(test_flags[i], 0) == 0) {
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testcase_no++;
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switch (i) {
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case 0:
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/*FALLTHROUGH*/ case 1:
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(void)kill(getpid(), SIGUSR1);
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break;
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case 2:
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/*FALLTHROUGH*/ case 3:
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(void)
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pthread_kill(pthread_self(),
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SIGUSR1);
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break;
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default:
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tst_brkm(TBROK, cleanup,
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"illegal case number");
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break;
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}
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}
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}
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}
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cleanup();
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tst_exit();
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}
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