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Handle ENOBUFS when receiving messages. 

Don't send messages if the receiver has died.
This commit is contained in:
roy 2018-03-21 12:37:12 +00:00
parent 5e9aa3e698
commit d96ab75caf
1 changed files with 34 additions and 6 deletions
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40
tests/lib/libc/sys/t_recvmmsg.c
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@ -1,4 +1,4 @@
/* $NetBSD: t_recvmmsg.c,v 1.1 2012/06/22 18:45:23 christos Exp $ */
/* $NetBSD: t_recvmmsg.c,v 1.2 2018/03/21 12:37:12 roy Exp $ */
/*-
* Copyright (c) 2012 The NetBSD Foundation, Inc.
@ -36,7 +36,7 @@
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: t_recvmmsg.c,v 1.1 2012/06/22 18:45:23 christos Exp $");
__RCSID("$NetBSD: t_recvmmsg.c,v 1.2 2018/03/21 12:37:12 roy Exp $");
#include <atf-c.h>
#include <sys/types.h>
@ -47,6 +47,7 @@ __RCSID("$NetBSD: t_recvmmsg.c,v 1.1 2012/06/22 18:45:23 christos Exp $");
#include <time.h>
#include <stdint.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
@ -57,7 +58,14 @@ __RCSID("$NetBSD: t_recvmmsg.c,v 1.1 2012/06/22 18:45:23 christos Exp $");
#define min(a, b) ((a) < (b) ? (a) : (b))
static int debug;
static volatile sig_atomic_t rdied;
static void
handle_sigchld(__unused int pid)
{
rdied = 1;
}
ATF_TC(recvmmsg_basic);
ATF_TC_HEAD(recvmmsg_basic, tc)
@ -75,7 +83,9 @@ ATF_TC_BODY(recvmmsg_basic, tc)
int status;
off_t off;
uint8_t DGRAM[1316] = { 0, 2, 3, 4, 5, 6, 7, 8, 9, };
struct sigaction sa;
ssize_t overf = 0;
error = socketpair(AF_UNIX, SOCK_DGRAM, 0, fd);
ATF_REQUIRE_MSG(error != -1, "socketpair failed (%s)", strerror(errno));
@ -98,6 +108,14 @@ ATF_TC_BODY(recvmmsg_basic, tc)
mmsghdr[n].msg_hdr.msg_namelen = 0;
}
memset(&sa, 0, sizeof(sa));
sa.sa_flags = SA_RESTART;
sa.sa_handler = &handle_sigchld;
sigemptyset(&sa.sa_mask);
error = sigaction(SIGCHLD, &sa, 0);
ATF_REQUIRE_MSG(error != -1, "sigaction failed (%s)",
strerror(errno));
switch (fork()) {
case -1:
ATF_REQUIRE_MSG(0, "fork failed (%s)", strerror(errno));
@ -112,6 +130,13 @@ ATF_TC_BODY(recvmmsg_basic, tc)
struct timespec ts = { 1, 0 };
cnt = recvmmsg(fd[1], mmsghdr, min(mmsgcnt, n),
MSG_WAITALL, &ts);
if (cnt == -1 && errno == ENOBUFS) {
overf++;
if (debug)
printf("receive buffer overflowed"
" (%zu)\n",overf);
continue;
}
ATF_REQUIRE_MSG(cnt != -1, "recvmmsg failed (%s)",
strerror(errno));
ATF_REQUIRE_MSG(cnt != 0, "recvmmsg timeout");
@ -138,16 +163,19 @@ ATF_TC_BODY(recvmmsg_basic, tc)
printf("sending packet %u/%u...\n", (n+1),
NPKTS);
do {
if (rdied)
break;
DGRAM[0] = n;
error = send(fd[0], DGRAM, sizeof(DGRAM), 0);
} while (error == -1 && errno == ENOBUFS);
if (error == -1)
ATF_REQUIRE_MSG(error != -1, "send failed (%s)",
strerror(errno));
ATF_REQUIRE_MSG(error != -1, "send failed (%s)",
strerror(errno));
}
error = wait(&status);
ATF_REQUIRE_MSG(error != -1, "wait failed (%s)",
strerror(errno));
ATF_REQUIRE_MSG(WIFEXITED(status) && WEXITSTATUS(status) == 0,
"receiver died");
break;
}
}