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diff --git a/lib/libc/tests/stdio/Makefile b/lib/libc/tests/stdio/Makefile
--- a/lib/libc/tests/stdio/Makefile
+++ b/lib/libc/tests/stdio/Makefile
@@ -2,6 +2,7 @@
.include <bsd.own.mk>
+ATF_TESTS_C+= eintr_test
ATF_TESTS_C+= fdopen_test
ATF_TESTS_C+= fmemopen2_test
ATF_TESTS_C+= fopen2_test
@@ -30,6 +31,7 @@
NETBSD_ATF_TESTS_C+= printf_test
NETBSD_ATF_TESTS_C+= scanf_test
+LIBADD.eintr_test+= md
LIBADD.printfloat_test+= m
LIBADD.scanfloat_test+= m
diff --git a/lib/libc/tests/stdio/eintr_test.c b/lib/libc/tests/stdio/eintr_test.c
new file mode 100644
--- /dev/null
+++ b/lib/libc/tests/stdio/eintr_test.c
@@ -0,0 +1,143 @@
+/*
+ * Initially written by Yar Tikhiy <yar@freebsd.org> in PR 76398.
+ * Bug fixes and instrumentation by kib@freebsd.org.
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <md5.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <atf-c.h>
+
+#define NDATA 1000
+#define DELAY 2
+
+static void
+hup(int signo __unused)
+{
+}
+
+static int ndata, seq;
+
+static void
+setdata(int n)
+{
+ ndata = n;
+ seq = 0;
+}
+
+static char *
+getdata(void)
+{
+ static char databuf[256];
+ static char xeof[] = "#";
+
+ if (seq > ndata)
+ return (NULL);
+ if (seq == ndata) {
+ seq++;
+ return (xeof);
+ }
+ sprintf(databuf, "%08d xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx\n", seq++);
+ return (databuf);
+}
+
+ATF_TC_WITHOUT_HEAD(eintr_test);
+ATF_TC_BODY(eintr_test, tc)
+{
+ char c, digest0[33], digest[33], *p;
+ FILE *fp;
+ int i, s[2], total0, total;
+ MD5_CTX md5;
+ pid_t child;
+ struct sigaction sa;
+
+ MD5Init(&md5);
+ setdata(NDATA);
+ for (total0 = 0; (p = getdata()) != NULL; total0 += strlen(p))
+ MD5Update(&md5, p, strlen(p));
+ p = MD5End(&md5, digest0);
+
+ sa.sa_handler = hup;
+ sigemptyset(&sa.sa_mask);
+ sa.sa_flags = 0;
+ ATF_REQUIRE(sigaction(SIGHUP, &sa, NULL) == 0);
+
+ ATF_REQUIRE(socketpair(PF_UNIX, SOCK_STREAM, 0, s) == 0);
+
+ switch (child = fork()) {
+ case -1:
+ atf_tc_fail("fork failed %s", strerror(errno));
+ break;
+
+ case 0:
+ ATF_REQUIRE((fp = fdopen(s[0], "w")) != NULL);
+ close(s[1]);
+ setdata(NDATA);
+ while ((p = getdata())) {
+ for (; *p;) {
+ if (fputc(*p, fp) == EOF) {
+ if (errno == EINTR) {
+ clearerr(fp);
+ } else {
+ atf_tc_fail("fputc errno %s",
+ strerror(errno));
+ }
+ } else {
+ p++;
+ }
+ }
+ }
+ fclose(fp);
+ break;
+
+ default:
+ close(s[0]);
+ ATF_REQUIRE((fp = fdopen(s[1], "r")) != NULL);
+ sleep(DELAY);
+ ATF_REQUIRE(kill(child, SIGHUP) != -1);
+ sleep(DELAY);
+ MD5Init(&md5);
+ for (total = 0;;) {
+ i = fgetc(fp);
+ if (i == EOF) {
+ if (errno == EINTR) {
+ clearerr(fp);
+ } else {
+ atf_tc_fail("fgetc errno %s",
+ strerror(errno));
+ }
+ continue;
+ }
+ total++;
+ c = i;
+ MD5Update(&md5, &c, 1);
+ if (i == '#')
+ break;
+ }
+ MD5End(&md5, digest);
+ fclose(fp);
+ ATF_REQUIRE_MSG(total == total0,
+ "Total number of bytes read does not match: %d %d",
+ total, total0);
+ ATF_REQUIRE_MSG(strcmp(digest, digest0) == 0,
+ "Digests do not match %s %s", digest, digest0);
+ break;
+ }
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+ ATF_TP_ADD_TC(tp, eintr_test);
+ return (atf_no_error());
+}

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