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_size is equal to 9 something smaller that MINSIGSTKSZ, then sigaltstack() shall return -1 10 and set errno to [ENOMEM]. 11 12 Steps: 13 - Set up a dummy handler for signal SIGTOTEST and set the sa_flags member to SA_ONSTACK. 14 - Allocate memory for the alternate signal stack (altstack1), but make it one byte shorter 15 than MINSIGSTKSZ 16 - call sigaltstack() to define the alternate signal stack 17 - Verify that sigaltstack() returns -1 and sets errno to [ENOMEM]. 18 */ 19 20 21 #include <signal.h> 22 #include <stdio.h> 23 #include <stdlib.h> 24 #include <errno.h> 25 #include "posixtest.h" 26 27 #define SIGTOTEST SIGUSR1 28 29 stack_t altstack1; 30 handler()31void handler() 32 { 33 printf("Just a dummy handler\n"); 34 } 35 main(void)36int main(void) 37 { 38 39 struct sigaction act; 40 act.sa_flags = SA_ONSTACK; 41 act.sa_handler = handler; 42 sigemptyset(&act.sa_mask); 43 44 if (sigaction(SIGTOTEST, &act, 0) == -1) { 45 perror 46 ("Unexpected error while attempting to setup test pre-conditions"); 47 return PTS_UNRESOLVED; 48 } 49 50 if ((altstack1.ss_sp = malloc(SIGSTKSZ)) == NULL) { 51 perror 52 ("Unexpected error while attempting to setup test pre-conditions"); 53 return PTS_UNRESOLVED; 54 } 55 56 altstack1.ss_flags = 0; 57 /* use value low enough for all kernel versions 58 * avoid using MINSIGSTKSZ defined by glibc as it could be different 59 * from the one in kernel ABI 60 */ 61 altstack1.ss_size = 2048 - 1; 62 63 if (sigaltstack(&altstack1, NULL) != -1) { 64 printf("Test FAILED: Expected return value of -1.\n"); 65 return PTS_FAIL; 66 } 67 68 if (errno != ENOMEM) { 69 printf("Test FAILED: Errno [ENOMEM] was expected.\n"); 70 return PTS_FAIL; 71 } 72 73 printf("Test PASSED\n"); 74 return PTS_PASS; 75 } 76