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select: fix poll-based check not detecting connect failure

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This commit changes Curl_socket_check to use POLLPRI to
check for connect failure on the write socket, because
POLLPRI maps to fds_err. This is in line with select(2).

The select-based socket check correctly checks for connect
failures by adding the write socket also to fds_err.

The poll-based implementation (which internally can itself
fallback to select again) did not previously check for
connect failure by using POLLPRI with the write socket.

See the follow up commit to this for more information.

This commit makes sure connect failures can be detected
and handled if HAVE_POLL_FINE is defined, eg. on msys2-devel.

Reviewed-by: Daniel Stenberg
Reviewed-by: Jay Satiro

Replaces #5509
Prepares #5707
This commit is contained in:
Marc Hoersken 2020-07-21 20:17:01 +02:00
parent 0f7c332f9f
commit e21bd22f84
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GPG Key ID: 61E03CBED7BC859E
1 changed files with 2 additions and 2 deletions
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4
lib/select.c
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@ -288,7 +288,7 @@ int Curl_socket_check(curl_socket_t readfd0, /* two sockets to read from */
}
if(writefd != CURL_SOCKET_BAD) {
pfd[num].fd = writefd;
pfd[num].events = POLLWRNORM|POLLOUT;
pfd[num].events = POLLWRNORM|POLLOUT|POLLPRI;
pfd[num].revents = 0;
num++;
}
@ -316,7 +316,7 @@ int Curl_socket_check(curl_socket_t readfd0, /* two sockets to read from */
if(writefd != CURL_SOCKET_BAD) {
if(pfd[num].revents & (POLLWRNORM|POLLOUT))
ret |= CURL_CSELECT_OUT;
if(pfd[num].revents & (POLLERR|POLLHUP|POLLNVAL))
if(pfd[num].revents & (POLLERR|POLLHUP|POLLPRI|POLLNVAL))
ret |= CURL_CSELECT_ERR;
}