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86 lines
2.2 KiB
86 lines
2.2 KiB
/*
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* Copyright 2002-2019 Intel Corporation.
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*
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* This software is provided to you as Sample Source Code as defined in the accompanying
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* End User License Agreement for the Intel(R) Software Development Products ("Agreement")
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* section 1.L.
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*
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* This software and the related documents are provided as is, with no express or implied
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* warranties, other than those that are expressly stated in the License.
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*/
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#include <stdlib.h>
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#include <signal.h>
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#include <stdio.h>
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#include <pthread.h>
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stack_t main_sigstk;
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FILE * log_fd;
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void PrintAndCompareAlternateStack(const char* prefix, const stack_t* compare_stack) {
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stack_t sigstk;
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int sigalt_result = sigaltstack(NULL, &sigstk);
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fprintf(log_fd, "%s: sigalt_result == %d {ss_sp=%p; ss_size=%d; ss_flags=%x}\n",
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prefix, sigalt_result, sigstk.ss_sp, (int)sigstk.ss_size, sigstk.ss_flags);
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if (sigalt_result < 0){
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perror("ERROR printing alternate stack");
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}
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if (!sigstk.ss_sp) {
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printf("%s: NO alternate stack\n", prefix);
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}
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if (compare_stack) {
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printf("%s: current stack %s to compare_stack\n", prefix,
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((sigstk.ss_sp == compare_stack->ss_sp) && sigstk.ss_size == compare_stack->ss_size)?
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"equals":"different");
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}
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}
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void *doThread(void* arg){
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PrintAndCompareAlternateStack("Thread", &main_sigstk);
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return NULL;
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}
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int main() {
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int err;
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log_fd = fopen("./threadtest_altstack.log", "w");
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if (log_fd <0 )
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perror("Could not open log file");
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// set current alternate stack
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main_sigstk.ss_sp = malloc(SIGSTKSZ);
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if (main_sigstk.ss_sp == NULL) {
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printf("Could not allocate ss_sp\n");
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return -1;
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}
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main_sigstk.ss_size = SIGSTKSZ;
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main_sigstk.ss_flags = 0;
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err = sigaltstack(&main_sigstk, NULL);
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if (err) {
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perror("Got error from sigaltstack");
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}
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PrintAndCompareAlternateStack("Main", NULL);
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pthread_t tid;
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err = pthread_create(&tid, NULL, doThread, NULL);
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if (err) {
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perror("Could not create a thread\n");
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}
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err = pthread_join(tid, NULL);
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if (err) {
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perror("Could not create a thread\n");
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}
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if (main_sigstk.ss_sp) free(main_sigstk.ss_sp);
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return 0;
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}
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