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pqWait() should check for exception status as well as read or write

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ready.  It appears that most (all?) Unixen will consider a socket to
be read or write ready if it has an error condition, but of course
Microsoft does things differently.
This commit is contained in:
Tom Lane 2001-03-31 23:13:30 +00:00
parent 8484f66923
commit fc0d3f1447
1 changed files with 10 additions and 3 deletions
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13
src/interfaces/libpq/fe-misc.c
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@ -25,7 +25,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-misc.c,v 1.47 2001/03/22 04:01:26 momjian Exp $
* $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-misc.c,v 1.48 2001/03/31 23:13:30 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -712,12 +712,17 @@ pqFlush(PGconn *conn)
/* --------------------------------------------------------------------- */
/* pqWait: wait until we can read or write the connection socket
*
* We also stop waiting and return if the kernel flags an exception condition
* on the socket. The actual error condition will be detected and reported
* when the caller tries to read or write the socket.
*/
int
pqWait(int forRead, int forWrite, PGconn *conn)
{
fd_set input_mask;
fd_set output_mask;
fd_set except_mask;
if (conn->sock < 0)
{
@ -731,17 +736,19 @@ pqWait(int forRead, int forWrite, PGconn *conn)
retry:
FD_ZERO(&input_mask);
FD_ZERO(&output_mask);
FD_ZERO(&except_mask);
if (forRead)
FD_SET(conn->sock, &input_mask);
if (forWrite)
FD_SET(conn->sock, &output_mask);
if (select(conn->sock + 1, &input_mask, &output_mask, (fd_set *) NULL,
FD_SET(conn->sock, &except_mask);
if (select(conn->sock + 1, &input_mask, &output_mask, &except_mask,
(struct timeval *) NULL) < 0)
{
if (errno == EINTR)
goto retry;
printfPQExpBuffer(&conn->errorMessage,
"pqWait() -- select() failed: errno=%d\n%s\n",
"pqWait() -- select() failed: errno=%d\n%s\n",
errno, strerror(errno));
return EOF;
}