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-rw-r--r--lib/select.c215
1 files changed, 64 insertions, 151 deletions
diff --git a/lib/select.c b/lib/select.c
index 2de503d37..b372efff1 100644
--- a/lib/select.c
+++ b/lib/select.c
@@ -5,7 +5,7 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
- * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
@@ -53,9 +53,6 @@
/* Convenience local macros */
#define ELAPSED_MS() (int)Curl_timediff(Curl_now(), initial_tv)
-int Curl_ack_eintr = 0;
-#define ERROR_NOT_EINTR(error) (Curl_ack_eintr || error != EINTR)
-
/*
* Internal function used for waiting a specific amount of ms
* in Curl_socket_check() and Curl_poll() when no file descriptor
@@ -74,13 +71,6 @@ int Curl_ack_eintr = 0;
*/
int Curl_wait_ms(int timeout_ms)
{
-#if !defined(MSDOS) && !defined(USE_WINSOCK)
-#ifndef HAVE_POLL_FINE
- struct timeval pending_tv;
-#endif
- struct curltime initial_tv;
- int pending_ms;
-#endif
int r = 0;
if(!timeout_ms)
@@ -94,28 +84,16 @@ int Curl_wait_ms(int timeout_ms)
#elif defined(USE_WINSOCK)
Sleep(timeout_ms);
#else
- pending_ms = timeout_ms;
- initial_tv = Curl_now();
- do {
- int error;
#if defined(HAVE_POLL_FINE)
- r = poll(NULL, 0, pending_ms);
+ r = poll(NULL, 0, timeout_ms);
#else
- pending_tv.tv_sec = pending_ms / 1000;
- pending_tv.tv_usec = (pending_ms % 1000) * 1000;
+ {
+ struct timeval pending_tv;
+ pending_tv.tv_sec = timeout_ms / 1000;
+ pending_tv.tv_usec = (timeout_ms % 1000) * 1000;
r = select(0, NULL, NULL, NULL, &pending_tv);
+ }
#endif /* HAVE_POLL_FINE */
- if(r != -1)
- break;
- error = SOCKERRNO;
- if(error && ERROR_NOT_EINTR(error))
- break;
- pending_ms = timeout_ms - ELAPSED_MS();
- if(pending_ms <= 0) {
- r = 0; /* Simulate a "call timed out" case */
- break;
- }
- } while(r == -1);
#endif /* USE_WINSOCK */
if(r)
r = -1;
@@ -158,7 +136,6 @@ int Curl_socket_check(curl_socket_t readfd0, /* two sockets to read from */
fd_set fds_err;
curl_socket_t maxfd;
#endif
- struct curltime initial_tv = {0, 0};
int pending_ms = 0;
int r;
int ret;
@@ -183,7 +160,6 @@ int Curl_socket_check(curl_socket_t readfd0, /* two sockets to read from */
if(timeout_ms > 0) {
pending_ms = (int)timeout_ms;
- initial_tv = Curl_now();
}
#ifdef HAVE_POLL_FINE
@@ -208,26 +184,11 @@ int Curl_socket_check(curl_socket_t readfd0, /* two sockets to read from */
num++;
}
- do {
- int error;
- if(timeout_ms < 0)
- pending_ms = -1;
- else if(!timeout_ms)
- pending_ms = 0;
- r = poll(pfd, num, pending_ms);
- if(r != -1)
- break;
- error = SOCKERRNO;
- if(error && ERROR_NOT_EINTR(error))
- break;
- if(timeout_ms > 0) {
- pending_ms = (int)(timeout_ms - ELAPSED_MS());
- if(pending_ms <= 0) {
- r = 0; /* Simulate a "call timed out" case */
- break;
- }
- }
- } while(r == -1);
+ if(timeout_ms < 0)
+ pending_ms = -1;
+ else if(!timeout_ms)
+ pending_ms = 0;
+ r = poll(pfd, num, pending_ms);
if(r < 0)
return -1;
@@ -290,61 +251,45 @@ int Curl_socket_check(curl_socket_t readfd0, /* two sockets to read from */
ptimeout = (timeout_ms < 0) ? NULL : &pending_tv;
- do {
- int error;
- if(timeout_ms > 0) {
- pending_tv.tv_sec = pending_ms / 1000;
- pending_tv.tv_usec = (pending_ms % 1000) * 1000;
- }
- else if(!timeout_ms) {
- pending_tv.tv_sec = 0;
- pending_tv.tv_usec = 0;
- }
+ if(timeout_ms > 0) {
+ pending_tv.tv_sec = pending_ms / 1000;
+ pending_tv.tv_usec = (pending_ms % 1000) * 1000;
+ }
+ else if(!timeout_ms) {
+ pending_tv.tv_sec = 0;
+ pending_tv.tv_usec = 0;
+ }
- /* WinSock select() must not be called with an fd_set that contains zero
- fd flags, or it will return WSAEINVAL. But, it also can't be called
- with no fd_sets at all! From the documentation:
+ /* WinSock select() must not be called with an fd_set that contains zero
+ fd flags, or it will return WSAEINVAL. But, it also can't be called
+ with no fd_sets at all! From the documentation:
- Any two of the parameters, readfds, writefds, or exceptfds, can be
- given as null. At least one must be non-null, and any non-null
- descriptor set must contain at least one handle to a socket.
+ Any two of the parameters, readfds, writefds, or exceptfds, can be
+ given as null. At least one must be non-null, and any non-null
+ descriptor set must contain at least one handle to a socket.
- We know that we have at least one bit set in at least two fd_sets in
- this case, but we may have no bits set in either fds_read or fd_write,
- so check for that and handle it. Luckily, with WinSock, we can _also_
- ask how many bits are set on an fd_set.
+ We know that we have at least one bit set in at least two fd_sets in
+ this case, but we may have no bits set in either fds_read or fd_write,
+ so check for that and handle it. Luckily, with WinSock, we can _also_
+ ask how many bits are set on an fd_set.
- It is unclear why WinSock doesn't just handle this for us instead of
- calling this an error.
+ It is unclear why WinSock doesn't just handle this for us instead of
+ calling this an error.
- Note also that WinSock ignores the first argument, so we don't worry
- about the fact that maxfd is computed incorrectly with WinSock (since
- curl_socket_t is unsigned in such cases and thus -1 is the largest
- value).
- */
+ Note also that WinSock ignores the first argument, so we don't worry
+ about the fact that maxfd is computed incorrectly with WinSock (since
+ curl_socket_t is unsigned in such cases and thus -1 is the largest
+ value).
+ */
#ifdef USE_WINSOCK
- r = select((int)maxfd + 1,
- fds_read.fd_count ? &fds_read : NULL,
- fds_write.fd_count ? &fds_write : NULL,
- &fds_err, ptimeout);
+ r = select((int)maxfd + 1,
+ fds_read.fd_count ? &fds_read : NULL,
+ fds_write.fd_count ? &fds_write : NULL,
+ &fds_err, ptimeout);
#else
- r = select((int)maxfd + 1, &fds_read, &fds_write, &fds_err, ptimeout);
+ r = select((int)maxfd + 1, &fds_read, &fds_write, &fds_err, ptimeout);
#endif
- if(r != -1)
- break;
- error = SOCKERRNO;
- if(error && ERROR_NOT_EINTR(error))
- break;
- if(timeout_ms > 0) {
- pending_ms = (int)(timeout_ms - ELAPSED_MS());
- if(pending_ms <= 0) {
- r = 0; /* Simulate a "call timed out" case */
- break;
- }
- }
- } while(r == -1);
-
if(r < 0)
return -1;
if(r == 0)
@@ -399,7 +344,6 @@ int Curl_poll(struct pollfd ufds[], unsigned int nfds, int timeout_ms)
fd_set fds_err;
curl_socket_t maxfd;
#endif
- struct curltime initial_tv = {0, 0};
bool fds_none = TRUE;
unsigned int i;
int pending_ms = 0;
@@ -425,31 +369,15 @@ int Curl_poll(struct pollfd ufds[], unsigned int nfds, int timeout_ms)
if(timeout_ms > 0) {
pending_ms = timeout_ms;
- initial_tv = Curl_now();
}
#ifdef HAVE_POLL_FINE
- do {
- int error;
- if(timeout_ms < 0)
- pending_ms = -1;
- else if(!timeout_ms)
- pending_ms = 0;
- r = poll(ufds, nfds, pending_ms);
- if(r != -1)
- break;
- error = SOCKERRNO;
- if(error && ERROR_NOT_EINTR(error))
- break;
- if(timeout_ms > 0) {
- pending_ms = (int)(timeout_ms - ELAPSED_MS());
- if(pending_ms <= 0) {
- r = 0; /* Simulate a "call timed out" case */
- break;
- }
- }
- } while(r == -1);
+ if(timeout_ms < 0)
+ pending_ms = -1;
+ else if(!timeout_ms)
+ pending_ms = 0;
+ r = poll(ufds, nfds, pending_ms);
if(r < 0)
return -1;
@@ -502,42 +430,27 @@ int Curl_poll(struct pollfd ufds[], unsigned int nfds, int timeout_ms)
ptimeout = (timeout_ms < 0) ? NULL : &pending_tv;
- do {
- int error;
- if(timeout_ms > 0) {
- pending_tv.tv_sec = pending_ms / 1000;
- pending_tv.tv_usec = (pending_ms % 1000) * 1000;
- }
- else if(!timeout_ms) {
- pending_tv.tv_sec = 0;
- pending_tv.tv_usec = 0;
- }
+ if(timeout_ms > 0) {
+ pending_tv.tv_sec = pending_ms / 1000;
+ pending_tv.tv_usec = (pending_ms % 1000) * 1000;
+ }
+ else if(!timeout_ms) {
+ pending_tv.tv_sec = 0;
+ pending_tv.tv_usec = 0;
+ }
#ifdef USE_WINSOCK
- r = select((int)maxfd + 1,
- /* WinSock select() can't handle fd_sets with zero bits set, so
- don't give it such arguments. See the comment about this in
- Curl_check_socket().
- */
- fds_read.fd_count ? &fds_read : NULL,
- fds_write.fd_count ? &fds_write : NULL,
- fds_err.fd_count ? &fds_err : NULL, ptimeout);
+ r = select((int)maxfd + 1,
+ /* WinSock select() can't handle fd_sets with zero bits set, so
+ don't give it such arguments. See the comment about this in
+ Curl_check_socket().
+ */
+ fds_read.fd_count ? &fds_read : NULL,
+ fds_write.fd_count ? &fds_write : NULL,
+ fds_err.fd_count ? &fds_err : NULL, ptimeout);
#else
- r = select((int)maxfd + 1, &fds_read, &fds_write, &fds_err, ptimeout);
+ r = select((int)maxfd + 1, &fds_read, &fds_write, &fds_err, ptimeout);
#endif
- if(r != -1)
- break;
- error = SOCKERRNO;
- if(error && ERROR_NOT_EINTR(error))
- break;
- if(timeout_ms > 0) {
- pending_ms = timeout_ms - ELAPSED_MS();
- if(pending_ms <= 0) {
- r = 0; /* Simulate a "call timed out" case */
- break;
- }
- }
- } while(r == -1);
if(r < 0)
return -1;
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