1 /* 2 * Copyright (c) 2002-2003, Intel Corporation. All rights reserved. 3 * Created by: salwan.searty REMOVE-THIS AT intel DOT com 4 * This file is licensed under the GPL license. For the full content 5 * of this license, see the COPYING file at the top level of this 6 * source tree. 7 8 This program tests the assertion that a signal explicitly declared to execute on 9 an alternate stack (using sigaltstack) shall be delivered on the alternate stack 10 specified by ss. 11 12 While it is easy to use a call like sigaltstack((stack_t *)0, &oss) to verify 13 that the signal stack that the handler is being executed on is the same alternate 14 signal stack ss that I defined for that signal, I do not want to rely of the 15 use of oss since we're testing sigaltstack(). 16 17 Instead, what I do is declare an integer i inside the handler and verify that 18 at least the address of i is located between ss.ss_sp and ss.ss_size. 19 20 */ 21 22 23 #include <signal.h> 24 #include <stdio.h> 25 #include <stdlib.h> 26 #include "posixtest.h" 27 28 #define SIGTOTEST SIGUSR1 29 30 stack_t alternate_s; 31 handler()32void handler() 33 { 34 int i = 0; 35 if ((void *)&i < (alternate_s.ss_sp) 36 || (long)&i >= 37 ((long)alternate_s.ss_sp + (long)alternate_s.ss_size)) { 38 39 printf 40 ("Test FAILED: address of local variable is not inside the memory allocated for the alternate signal stack\n"); 41 exit(PTS_FAIL); 42 } 43 } 44 main(void)45int main(void) 46 { 47 48 struct sigaction act; 49 act.sa_flags = SA_ONSTACK; 50 act.sa_handler = handler; 51 sigemptyset(&act.sa_mask); 52 53 if (sigaction(SIGUSR1, &act, 0) == -1) { 54 perror 55 ("Unexpected error while attempting to setup test pre-conditions"); 56 return PTS_UNRESOLVED; 57 } 58 59 if ((alternate_s.ss_sp = malloc(SIGSTKSZ)) == NULL) { 60 perror 61 ("Unexpected error while attempting to setup test pre-conditions"); 62 return PTS_UNRESOLVED; 63 } 64 65 alternate_s.ss_flags = 0; 66 alternate_s.ss_size = SIGSTKSZ; 67 68 if (sigaltstack(&alternate_s, NULL) == -1) { 69 perror 70 ("Unexpected error while attempting to setup test pre-conditions"); 71 return PTS_UNRESOLVED; 72 } 73 74 if (raise(SIGUSR1) == -1) { 75 perror 76 ("Unexpected error while attempting to setup test pre-conditions"); 77 return PTS_UNRESOLVED; 78 } 79 80 printf("Test PASSED\n"); 81 return PTS_PASS; 82 } 83