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 #define _XOPEN_SOURCE 600 21 22 #include <signal.h> 23 #include <stdio.h> 24 #include <stdlib.h> 25 #include <errno.h> 26 #include "posixtest.h" 27 28 #define SIGTOTEST SIGUSR1 29 30 stack_t altstack1; 31 handler()32void handler() 33 { 34 printf("Just a dummy handler\n"); 35 } 36 main(void)37int main(void) 38 { 39 40 struct sigaction act; 41 act.sa_flags = SA_ONSTACK; 42 act.sa_handler = handler; 43 sigemptyset(&act.sa_mask); 44 45 if (sigaction(SIGTOTEST, &act, 0) == -1) { 46 perror 47 ("Unexpected error while attempting to setup test pre-conditions"); 48 return PTS_UNRESOLVED; 49 } 50 51 if ((altstack1.ss_sp = malloc(SIGSTKSZ)) == NULL) { 52 perror 53 ("Unexpected error while attempting to setup test pre-conditions"); 54 return PTS_UNRESOLVED; 55 } 56 57 altstack1.ss_flags = 0; 58 /* use value low enough for all kernel versions 59 * avoid using MINSIGSTKSZ defined by glibc as it could be different 60 * from the one in kernel ABI 61 */ 62 altstack1.ss_size = 2048 - 1; 63 64 if (sigaltstack(&altstack1, NULL) != -1) { 65 printf("Test FAILED: Expected return value of -1.\n"); 66 return PTS_FAIL; 67 } 68 69 if (errno != ENOMEM) { 70 printf("Test FAILED: Errno [ENOMEM] was expected.\n"); 71 return PTS_FAIL; 72 } 73 74 printf("Test PASSED\n"); 75 return PTS_PASS; 76 } 77