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sockets: new Curl_socket_check() can wait for 3 sockets

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This offers an alternative to the existing Curl_socket_ready() API which
only checks one socket for read and one for write.
This commit is contained in:
Daniel Stenberg 2011-12-08 16:14:30 +01:00
parent bedfafe38e
commit 5527417afa
2 changed files with 66 additions and 21 deletions
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75
lib/select.c
View File

@ -125,11 +125,11 @@ int Curl_wait_ms(int timeout_ms)
}
/*
* This is an internal function used for waiting for read or write
* events on a pair of file descriptors. It uses poll() when a fine
* poll() is available, in order to avoid limits with FD_SETSIZE,
* otherwise select() is used. An error is returned if select() is
* being used and a file descriptor is too large for FD_SETSIZE.
* Wait for read or write events on a set of file descriptors. It uses poll()
* when a fine poll() is available, in order to avoid limits with FD_SETSIZE,
* otherwise select() is used. An error is returned if select() is being used
* and a file descriptor is too large for FD_SETSIZE.
*
* A negative timeout value makes this function wait indefinitely,
* unles no valid file descriptor is given, when this happens the
* negative timeout is ignored and the function times out immediately.
@ -140,10 +140,17 @@ int Curl_wait_ms(int timeout_ms)
* Return values:
* -1 = system call error or fd >= FD_SETSIZE
* 0 = timeout
* CURL_CSELECT_IN | CURL_CSELECT_OUT | CURL_CSELECT_ERR
* [bitmask] = action as described below
*
* CURL_CSELECT_IN - first socket is readable
* CURL_CSELECT_IN2 - second socket is readable
* CURL_CSELECT_OUT - write socket is writable
* CURL_CSELECT_ERR - an error condition occurred
*/
int Curl_socket_ready(curl_socket_t readfd, curl_socket_t writefd,
long timeout_ms)
int Curl_socket_check(curl_socket_t readfd0, /* two sockets to read from */
curl_socket_t readfd1,
curl_socket_t writefd, /* socket to write to */
long timeout_ms) /* milliseconds to wait */
{
#ifdef HAVE_POLL_FINE
struct pollfd pfd[2];
@ -162,7 +169,9 @@ int Curl_socket_ready(curl_socket_t readfd, curl_socket_t writefd,
int r;
int ret;
if((readfd == CURL_SOCKET_BAD) && (writefd == CURL_SOCKET_BAD)) {
if((readfd0 == CURL_SOCKET_BAD) && (readfd1 == CURL_SOCKET_BAD) &&
(writefd == CURL_SOCKET_BAD)) {
/* no sockets, just wait */
r = Curl_wait_ms((int)timeout_ms);
return r;
}
@ -180,8 +189,14 @@ int Curl_socket_ready(curl_socket_t readfd, curl_socket_t writefd,
#ifdef HAVE_POLL_FINE
num = 0;
if(readfd != CURL_SOCKET_BAD) {
pfd[num].fd = readfd;
if(readfd0 != CURL_SOCKET_BAD) {
pfd[num].fd = readfd0;
pfd[num].events = POLLRDNORM|POLLIN|POLLRDBAND|POLLPRI;
pfd[num].revents = 0;
num++;
}
if(readfd1 != CURL_SOCKET_BAD) {
pfd[num].fd = readfd1;
pfd[num].events = POLLRDNORM|POLLIN|POLLRDBAND|POLLPRI;
pfd[num].revents = 0;
num++;
@ -218,13 +233,20 @@ int Curl_socket_ready(curl_socket_t readfd, curl_socket_t writefd,
ret = 0;
num = 0;
if(readfd != CURL_SOCKET_BAD) {
if(readfd0 != CURL_SOCKET_BAD) {
if(pfd[num].revents & (POLLRDNORM|POLLIN|POLLERR|POLLHUP))
ret |= CURL_CSELECT_IN;
if(pfd[num].revents & (POLLRDBAND|POLLPRI|POLLNVAL))
ret |= CURL_CSELECT_ERR;
num++;
}
if(readfd1 != CURL_SOCKET_BAD) {
if(pfd[num].revents & (POLLRDNORM|POLLIN|POLLERR|POLLHUP))
ret |= CURL_CSELECT_IN2;
if(pfd[num].revents & (POLLRDBAND|POLLPRI|POLLNVAL))
ret |= CURL_CSELECT_ERR;
num++;
}
if(writefd != CURL_SOCKET_BAD) {
if(pfd[num].revents & (POLLWRNORM|POLLOUT))
ret |= CURL_CSELECT_OUT;
@ -240,11 +262,18 @@ int Curl_socket_ready(curl_socket_t readfd, curl_socket_t writefd,
maxfd = (curl_socket_t)-1;
FD_ZERO(&fds_read);
if(readfd != CURL_SOCKET_BAD) {
VERIFY_SOCK(readfd);
FD_SET(readfd, &fds_read);
FD_SET(readfd, &fds_err);
maxfd = readfd;
if(readfd0 != CURL_SOCKET_BAD) {
VERIFY_SOCK(readfd0);
FD_SET(readfd0, &fds_read);
FD_SET(readfd0, &fds_err);
maxfd = readfd0;
}
if(readfd1 != CURL_SOCKET_BAD) {
VERIFY_SOCK(readfd1);
FD_SET(readfd1, &fds_read);
FD_SET(readfd1, &fds_err);
if(readfd1 > maxfd)
maxfd = readfd1;
}
FD_ZERO(&fds_write);
@ -286,10 +315,16 @@ int Curl_socket_ready(curl_socket_t readfd, curl_socket_t writefd,
return 0;
ret = 0;
if(readfd != CURL_SOCKET_BAD) {
if(FD_ISSET(readfd, &fds_read))
if(readfd0 != CURL_SOCKET_BAD) {
if(FD_ISSET(readfd0, &fds_read))
ret |= CURL_CSELECT_IN;
if(FD_ISSET(readfd, &fds_err))
if(FD_ISSET(readfd0, &fds_err))
ret |= CURL_CSELECT_ERR;
}
if(readfd1 != CURL_SOCKET_BAD) {
if(FD_ISSET(readfd1, &fds_read))
ret |= CURL_CSELECT_IN2;
if(FD_ISSET(readfd1, &fds_err))
ret |= CURL_CSELECT_ERR;
}
if(writefd != CURL_SOCKET_BAD) {

12
lib/select.h
View File

@ -84,9 +84,19 @@ struct pollfd
#define POLLRDBAND POLLPRI
#endif
int Curl_socket_ready(curl_socket_t readfd, curl_socket_t writefd,
/* there are three CSELECT defines that are defined in the public header that
are exposed to users, but this *IN2 bit is only ever used internally and
therefore defined here */
#define CURL_CSELECT_IN2 (CURL_CSELECT_ERR << 1)
int Curl_socket_check(curl_socket_t readfd, curl_socket_t readfd2,
curl_socket_t writefd,
long timeout_ms);
/* provide the former API internally */
#define Curl_socket_ready(x,y,z) \
Curl_socket_check(x, CURL_SOCKET_BAD, y, z)
int Curl_poll(struct pollfd ufds[], unsigned int nfds, int timeout_ms);
int Curl_wait_ms(int timeout_ms);