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From d56013fb245dc2878ee91bbb937a91850050ada3 Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Mon, 21 Nov 2022 17:42:04 +0100
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Subject: [PATCH] sd-bus: handle -EINTR return from bus_poll()
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In sd_bus_wait(), let's convert EINTR to a return code of 0, thus asking
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the caller do loop again and enter sd_bus_process() again (which will
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not find any queued events). This way we'll not return an error on
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something that isn't really an error. This should typically make sure
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things are properly handled by the caller, magically, without eating up
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the event entirely, and still giving the caller time to run some code if
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they want.
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(cherry picked from commit 3022916b4d2483452c3ddbbac9ee7c4372b1cb46)
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Resolves: #2137584
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---
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src/libsystemd/sd-bus/bus-socket.c | 5 ++++-
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src/libsystemd/sd-bus/sd-bus.c | 18 +++++++++++++++---
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2 files changed, 19 insertions(+), 4 deletions(-)
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diff --git a/src/libsystemd/sd-bus/bus-socket.c b/src/libsystemd/sd-bus/bus-socket.c
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index c94befef73..253f41c636 100644
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--- a/src/libsystemd/sd-bus/bus-socket.c
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+++ b/src/libsystemd/sd-bus/bus-socket.c
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@@ -1308,8 +1308,11 @@ int bus_socket_process_opening(sd_bus *b) {
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assert(b->state == BUS_OPENING);
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events = fd_wait_for_event(b->output_fd, POLLOUT, 0);
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- if (events < 0)
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+ if (events < 0) {
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+ if (ERRNO_IS_TRANSIENT(events))
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+ return 0;
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return events;
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+ }
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if (!(events & (POLLOUT|POLLERR|POLLHUP)))
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return 0;
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diff --git a/src/libsystemd/sd-bus/sd-bus.c b/src/libsystemd/sd-bus/sd-bus.c
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index bc716afabf..c3a1bae295 100644
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--- a/src/libsystemd/sd-bus/sd-bus.c
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+++ b/src/libsystemd/sd-bus/sd-bus.c
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@@ -2465,8 +2465,11 @@ _public_ int sd_bus_call(
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left = UINT64_MAX;
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r = bus_poll(bus, true, left);
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- if (r < 0)
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+ if (r < 0) {
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+ if (ERRNO_IS_TRANSIENT(r))
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+ continue;
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goto fail;
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+ }
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if (r == 0) {
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r = -ETIMEDOUT;
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goto fail;
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@@ -3321,6 +3324,7 @@ static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) {
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}
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_public_ int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) {
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+ int r;
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assert_return(bus, -EINVAL);
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assert_return(bus = bus_resolve(bus), -ENOPKG);
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@@ -3335,7 +3339,11 @@ _public_ int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) {
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if (bus->rqueue_size > 0)
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return 0;
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- return bus_poll(bus, false, timeout_usec);
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+ r = bus_poll(bus, false, timeout_usec);
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+ if (r < 0 && ERRNO_IS_TRANSIENT(r))
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+ return 1; /* treat EINTR as success, but let's exit, so that the caller will call back into us soon. */
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+
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+ return r;
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}
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_public_ int sd_bus_flush(sd_bus *bus) {
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@@ -3377,8 +3385,12 @@ _public_ int sd_bus_flush(sd_bus *bus) {
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return 0;
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r = bus_poll(bus, false, UINT64_MAX);
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- if (r < 0)
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+ if (r < 0) {
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+ if (ERRNO_IS_TRANSIENT(r))
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+ continue;
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+
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return r;
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+ }
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}
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}
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