check_signal: system call restart is done only once

Fujitsu: POSTK_TEMP_FIX_66
Refs: #1009
Change-Id: Ic0f04ac6b7f6c6bb01b55fb389bf9befd56b1dd9

test/issues/1009/C1009T01.c

@@ -0,0 +1,107 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/types.h>
+#include <errno.h>
+#include <signal.h>
+#include <asm/prctl.h>
+#include <sys/prctl.h>
+
+int arch_prctl(int code, unsigned long *addr);
+
+void
+sigusr(int sig)
+{
+	if (sig == SIGUSR1) {
+		printf("SIGUSR1\n");
+	}
+	else if (sig == SIGUSR2) {
+		printf("SIGUSR2\n");
+	}
+	else {
+		printf("other sig\n");
+	}
+	fflush(stdout);
+}
+
+int
+main(int argc, char **argv)
+{
+	struct sigaction act;
+	pid_t pid1 = 0;
+	pid_t pid2 = 0;
+	pid_t parent;
+	int pfd[2];
+	char ch;
+	int rc;
+	unsigned long val;
+
+	memset(&act, '\0', sizeof(act));
+	act.sa_handler = sigusr;
+	act.sa_flags = SA_RESTART;
+	sigaction(SIGUSR1, &act, NULL);
+	sigaction(SIGUSR2, &act, NULL);
+
+	pipe(pfd);
+
+	parent = getpid();
+	val = 1;
+	if (arch_prctl(999, (unsigned long *)val) == -1) {
+		fprintf(stderr, "C1009T01 WARN: no mckernel patch detected.\n");
+		exit(1);
+	}
+
+	if ((pid1 = fork())) {
+		pid2 = fork();
+	}
+
+	if (!pid1 || !pid2) {
+		int sig;
+
+		close(pfd[0]);
+		if (pid1)
+			sig = SIGUSR2;
+		else
+			sig = SIGUSR1;
+
+		sleep(1);
+		kill(parent, sig);
+		if (pid1) {
+			sleep(2);
+			ch = 'B';
+		}
+		else {
+			sleep(1);
+			ch = 'A';
+		}
+		write(pfd[1], &ch, 1);
+		close(pfd[1]);
+		exit(0);
+	}
+	rc = read(pfd[0], &ch, 1);
+	if (rc != 1) {
+		printf("C1009T01 NG: read error rc=%d errno=%d\n", rc, errno);
+		exit(1);
+	}
+	if (ch != 'A') {
+		printf("C1009T01 NG: read BAD DATA ch=%c\n", ch);
+		exit(1);
+	}
+	val = 0;
+	arch_prctl(999, (unsigned long *)val);
+	printf("read %c OK\n", ch);
+	rc = read(pfd[0], &ch, 1);
+	if (rc != 1) {
+		printf("C1009T01 NG: read error rc=%d errno=%d\n", rc, errno);
+		exit(1);
+	}
+	if (ch != 'B') {
+		printf("C1009T01 NG: read BAD DATA ch=%c\n", ch);
+		exit(1);
+	}
+
+	printf("read %c OK\n", ch);
+	printf("*** C1009T01: OK\n");
+	exit(0);
+}