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List: cygwin-patches
Subject: [PATCH] Cygwin: testsuite: Add socketpair_full test
From: Jon Turney <jon.turney () dronecode ! org ! uk>
Date: 2023-08-08 16:01:57
Message-ID: 20230808160157.6571-1-jon.turney () dronecode ! org ! uk
[Download RAW message or body]
Add the socketpair_full test from [1], fixed by [2], slightly improved by
the addition of a timeout.
This test might perhaps be better named.
This might also serve as an example of how to add new tests.
[1] https://cygwin.com/pipermail/cygwin-developers/2023-July/012640.html
[2] dedbbd74d0a8 ("Cygwin: select: workaround FD_WRITE network event handling")
---
winsup/testsuite/Makefile.am | 1 +
winsup/testsuite/winsup.api/socketpair_full.c | 59 +++++++++++++++++++
2 files changed, 60 insertions(+)
create mode 100644 winsup/testsuite/winsup.api/socketpair_full.c
diff --git a/winsup/testsuite/Makefile.am b/winsup/testsuite/Makefile.am
index 228955668..28b23b758 100644
--- a/winsup/testsuite/Makefile.am
+++ b/winsup/testsuite/Makefile.am
@@ -48,6 +48,7 @@ check_PROGRAMS = \
winsup.api/shmtest \
winsup.api/sigchld \
winsup.api/signal-into-win32-api \
+ winsup.api/socketpair_full \
winsup.api/systemcall \
winsup.api/user_malloc \
winsup.api/waitpid \
diff --git a/winsup/testsuite/winsup.api/socketpair_full.c \
b/winsup/testsuite/winsup.api/socketpair_full.c new file mode 100644
index 000000000..d432bc76d
--- /dev/null
+++ b/winsup/testsuite/winsup.api/socketpair_full.c
@@ -0,0 +1,59 @@
+//
+// This test verifies that a socket correctly indicates not ready to write when
+// poll()ed if a subsequent write() would block
+//
+//
+
+#include <assert.h>
+#include <poll.h>
+#include <stdio.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+static void timeout(int signum)
+{
+ exit(1);
+}
+
+int main()
+{
+ char wbuf[100] = { 0, };
+ int out;
+
+ signal(SIGALRM, timeout);
+
+ {
+ int sv[2];
+ int s;
+
+ s = socketpair (AF_UNIX, SOCK_STREAM, 0, sv);
+ assert (s == 0);
+
+ out = sv[0];
+ }
+
+ size_t in_flight = 0;
+ while (1)
+ {
+ struct pollfd fds[1];
+ fds[0].fd = out;
+ fds[0].events = POLLOUT;
+
+ int r = poll(fds, 1, 0);
+ assert(r >= 0);
+
+ // fd is not ready to write
+ if (!(fds[0].revents & POLLOUT))
+ break;
+
+ alarm(5);
+
+ // otherwise, fd is ready to write, implies some data may be written without \
blocking + ssize_t s = write (out, wbuf, sizeof wbuf);
+ assert (s > 0);
+ in_flight += s;
+ printf("%zd written, total in_flight %zd\n", s, in_flight);
+
+ alarm(0);
+ }
+}
--
2.39.0
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