Inspired by Martijn Koster's patch and example source at

http://www.greenhills.co.uk/mak/gentoo/curl-eintr-bug.c, I now made the
select() and poll() calls properly loop if they return -1 and errno is
EINTR. glibc docs for this is found here:
http://www.gnu.org/software/libc/manual/html_node/Interrupted-Primitives.html

This last link says BSD doesn't have this "effect". Will there be a problem
if we do this unconditionally?
S: ----------------------------------------------------------------------

CHANGES

@@ -7,6 +7,16 @@
                                   Changelog
 
 
+Daniel (13 January 2005)
+- Inspired by Martijn Koster's patch and example source at
+  http://www.greenhills.co.uk/mak/gentoo/curl-eintr-bug.c, I now made the
+  select() and poll() calls properly loop if they return -1 and errno is
+  EINTR. glibc docs for this is found here:
+  http://www.gnu.org/software/libc/manual/html_node/Interrupted-Primitives.html
+
+  This last link says BSD doesn't have this "effect". Will there be a problem
+  if we do this unconditionally?
+
 Daniel (11 January 2005)
 - Dan Torop cleaned up a few no longer used variables from David Phillips'
   select() overhaul fix.

RELEASE-NOTES

@@ -16,6 +16,7 @@ This release includes the following changes:
 
 This release includes the following bugfixes:
 
+ o re-invoke some system calls on EINTR
  o duplicate Host: when failed connection re-use
  o SOCKS5 version check
  o memory problem with cleaning up multi interface
@@ -36,6 +37,7 @@ advice from friends like these:
 
  Dan Fandrich, Peter Pentchev, Marcin Konicki, Rune Kleveland, David Shaw,
  Werner Koch, Gisle Vanem, Alex Neblett, Kai Sommerfeld, Marty Kuhrt,
- Hzhijun, Pavel Orehov, Bruce Mitchener, Cyrill Osterwalder, Dan Torop
+ Hzhijun, Pavel Orehov, Bruce Mitchener, Cyrill Osterwalder, Dan Torop,
+ Martijn Koster
 
         Thanks! (and sorry if I forgot to mention someone)

lib/select.c

@@ -23,6 +23,8 @@
 
 #include "setup.h"
 
+#include <errno.h>
+
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
@@ -80,7 +82,9 @@ int Curl_select(curl_socket_t readfd, curl_socket_t writefd, int timeout_ms)
     num++;
   }
 
+  do {
     r = poll(pfd, num, timeout_ms);
+  } while((r == -1) && (errno == EINTR));
 
   if (r < 0)
     return -1;
@@ -142,7 +146,9 @@ int Curl_select(curl_socket_t readfd, curl_socket_t writefd, int timeout_ms)
       maxfd = writefd;
   }
 
+  do {
     r = select(maxfd + 1, &fds_read, &fds_write, &fds_err, &timeout);
+  } while((r == -1) && (errno == EINTR));
 
   if (r < 0)
     return -1;
@@ -179,8 +185,11 @@ int Curl_select(curl_socket_t readfd, curl_socket_t writefd, int timeout_ms)
  */
 int Curl_poll(struct pollfd ufds[], unsigned int nfds, int timeout_ms)
 {
+  int r;
 #ifdef HAVE_POLL_FINE
-    return poll(ufds, nfds, timeout_ms);
+  do {
+    r = poll(ufds, nfds, timeout_ms);
+  } while((r == -1) && (errno == EINTR));
 #else
   struct timeval timeout;
   struct timeval *ptimeout;
@@ -188,7 +197,6 @@ int Curl_poll(struct pollfd ufds[], unsigned int nfds, int timeout_ms)
   fd_set fds_write;
   fd_set fds_err;
   curl_socket_t maxfd;
-  int r;
   unsigned int i;
 
   FD_ZERO(&fds_read);
@@ -223,7 +231,9 @@ int Curl_poll(struct pollfd ufds[], unsigned int nfds, int timeout_ms)
     ptimeout = &timeout;
   }
 
+  do {
     r = select(maxfd + 1, &fds_read, &fds_write, &fds_err, ptimeout);
+  } while((r == -1) && (errno == EINTR));
 
   if (r < 0)
     return -1;
@@ -244,7 +254,6 @@ int Curl_poll(struct pollfd ufds[], unsigned int nfds, int timeout_ms)
     if (ufds[i].revents != 0)
       r++;
   }
-
-  return r;
 #endif
+  return r;
 }