tools/testing/selftests/powerpc/signal/sig_sc_double_restart.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/powerpc/signal/sig_sc_double_restart.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/powerpc/signal/sig_sc_double_restart.c
Extension
.c
Size
3942 bytes
Lines
175
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

if (sigaction(SIGUSR1, &act, NULL) == -1) {
			perror("sigaction");
			exit(EXIT_FAILURE);
		}

		memset(&act, 0, sizeof(act));
		act.sa_handler = SIGUSR2_handler;
		act.sa_flags = SA_RESTART;
		if (sigaction(SIGUSR2, &act, NULL) == -1) {
			perror("sigaction");
			exit(EXIT_FAILURE);
		}

		/* Let's get ERESTARTSYS into r3 */
		while ((fd = dup(pipefd[0])) != 512) {
			if (fd == -1) {
				perror("dup");
				exit(EXIT_FAILURE);
			}
		}

		if (raw_read(fd, buf, 512) == -1) {
			if (errno == ENOANO) {
				fprintf(stderr, "Double restart moved restart before sc instruction.\n");
				_exit(EXIT_FAILURE);
			}
			perror("read");
			exit(EXIT_FAILURE);
		}

		if (strncmp(buf, DATA, DLEN)) {
			fprintf(stderr, "bad test string %s\n", buf);
			exit(EXIT_FAILURE);
		}

		return 0;

	} else {
		int wstatus;

		usleep(100000);		/* Hack to get reader waiting */
		kill(pid, SIGUSR1);
		usleep(100000);
		if (write(pipefd[1], DATA, DLEN) != DLEN) {
			perror("write");
			exit(EXIT_FAILURE);
		}
		close(pipefd[0]);
		close(pipefd[1]);
		if (wait(&wstatus) == -1) {
			perror("wait");
			exit(EXIT_FAILURE);
		}
		if (!WIFEXITED(wstatus)) {
			fprintf(stderr, "child exited abnormally\n");
			exit(EXIT_FAILURE);
		}

		FAIL_IF(WEXITSTATUS(wstatus) != EXIT_SUCCESS);

		return 0;
	}
}

int main(void)
{
	test_harness_set_timeout(10);
	return test_harness(test_restart, "sig sys restart");
}

Annotation

Implementation Notes