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 if the ss_flags member is not set to SS_DISABLE, 9 the stack shall be enabled, and the ss_sp and ss_size members specify the new address 10 and size of the stack. 11 12 Steps: 13 - Set up a handler for signal SIGTOTEST and set the sa_flags member to SA_ONSTACK. 14 - Allocate memory for the alternate signal stack (altstack1) 15 - call sigaltstack() to define the alternate signal stack 16 - raise SIGTOTEST 17 - Inside the handler, try to change the alternate signal stack to altstack2, and verify 18 that the attempt fails. 19 */ 20 21 22 #include <signal.h> 23 #include <stdio.h> 24 #include <stdlib.h> 25 #include "posixtest.h" 26 27 #define SIGTOTEST SIGUSR1 28 29 static stack_t altstack1; 30 31 void handler() 32 { 33 stack_t altstack2; 34 35 if ((altstack2.ss_sp = malloc(SIGSTKSZ)) == NULL) { 36 perror 37 ("Unexpected error while attempting to setup test pre-conditions"); 38 exit(PTS_UNRESOLVED); 39 } 40 41 altstack2.ss_flags = 0; 42 altstack2.ss_size = SIGSTKSZ; 43 44 if (sigaltstack(&altstack2, NULL) != -1) { 45 printf 46 ("Test FAILED: Attempt to set change alternate stack while inside handler succeeded.\n"); 47 exit(PTS_FAIL); 48 } 49 } 50 51 int main(void) 52 { 53 54 struct sigaction act; 55 act.sa_flags = SA_ONSTACK; 56 act.sa_handler = handler; 57 sigemptyset(&act.sa_mask); 58 59 if (sigaction(SIGTOTEST, &act, 0) == -1) { 60 perror 61 ("Unexpected error while attempting to setup test pre-conditions"); 62 return PTS_UNRESOLVED; 63 } 64 65 if ((altstack1.ss_sp = malloc(SIGSTKSZ)) == NULL) { 66 perror 67 ("Unexpected error while attempting to setup test pre-conditions"); 68 return PTS_UNRESOLVED; 69 } 70 71 altstack1.ss_flags = 0; 72 altstack1.ss_size = SIGSTKSZ; 73 74 if (sigaltstack(&altstack1, NULL) == -1) { 75 perror 76 ("Unexpected error while attempting to setup test pre-conditions"); 77 return PTS_UNRESOLVED; 78 } 79 80 if (raise(SIGTOTEST) == -1) { 81 perror 82 ("Unexpected error while attempting to setup test pre-conditions"); 83 return PTS_UNRESOLVED; 84 } 85 86 printf("Test PASSED\n"); 87 return PTS_PASS; 88 } 89