tests: convert epoll_create1.test from match_grep to match_diff

* tests/epoll_create1.c (main): Print expected output.
* tests/epoll_create1.test: Use match_diff instead of match_grep.
* tests/epoll_create1.expected: Remove.
* tests/Makefile.am (EXTRA_DIST): Remove epoll_create1.expected.

tests/Makefile.am

@@ -307,7 +307,6 @@ AM_TEST_LOG_FLAGS = STRACE_ARCH=$(ARCH) $(srcdir)/run.sh
 EXTRA_DIST = init.sh run.sh match.awk \
 	     caps.awk \
 	     dumpio.expected \
-	     epoll_create1.expected \
 	     eventfd.expected \
 	     execve.expected \
 	     execve-v.expected \

tests/epoll_create1.c

@@ -28,6 +28,7 @@
 #include "tests.h"
 #include <assert.h>
 #include <fcntl.h>
+#include <stdio.h>
 #include <unistd.h>
 #include <sys/syscall.h>
 
@@ -37,9 +38,15 @@ int
 main(void)
 {
 	(void) close(0);
+
 	if (syscall(__NR_epoll_create1, O_CLOEXEC))
 		perror_msg_and_skip("epoll_create1 O_CLOEXEC");
+	puts("epoll_create1(EPOLL_CLOEXEC) = 0");
+
 	assert(syscall(__NR_epoll_create1, O_CLOEXEC | O_NONBLOCK) == -1);
+	printf("epoll_create1(EPOLL_CLOEXEC|%#x) = -1 EINVAL (%m)\n", O_NONBLOCK);
+
+	puts("+++ exited with 0 +++");
 	return 0;
 }
 

tests/epoll_create1.expected

@@ -1,2 +0,0 @@
-epoll_create1\(EPOLL_CLOEXEC\) += 0
-epoll_create1\(EPOLL_CLOEXEC\|0x[[:xdigit:]]+\) += -1 EINVAL .*

tests/epoll_create1.test

@@ -4,8 +4,10 @@
 
 . "${srcdir=.}/init.sh"
 
-run_prog
-run_strace -e epoll_create1 $args
-match_grep
+run_prog > /dev/null
+OUT="$LOG.out"
+run_strace -a28 -eepoll_create1 $args > "$OUT"
+match_diff "$LOG" "$OUT"
+rm -f "$OUT"
 
 exit 0