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ssh_statemach_act() is now modified to loop over the switch() to perform as

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much as possible in one go, as long as it doesn't block and hasn't reached the
end of the state machine.
This avoids spurious -1 returns from curl_multi_fdset() simply because
previously it would return from this function without anything in EWOUDLBLOCK
and thus basically it wasn't actually waiting for anything!!
This commit is contained in:
Daniel Stenberg 2010-01-11 23:10:53 +00:00
parent 2158e234aa
commit d17416190b
1 changed files with 1637 additions and 1632 deletions
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41
lib/ssh.c
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@ -5,7 +5,7 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2009, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 1998 - 2010, 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
@ -459,10 +459,10 @@ static int sshkeycallback(CURL *easy,
#endif
/*
* ssh_statemach_act() runs the SSH statemachine "one round" and returns. The
* data the pointer 'block' points to will be set to TRUE if the libssh2
* function returns LIBSSH2_ERROR_EAGAIN meaning it wants to be called again
* when the socket is ready
* ssh_statemach_act() runs the SSH state machine as far as it can without
* blocking and without reaching the end. The data the pointer 'block' points
* to will be set to TRUE if the libssh2 function returns LIBSSH2_ERROR_EAGAIN
* meaning it wants to be called again when the socket is ready
*/
static CURLcode ssh_statemach_act(struct connectdata *conn, bool *block)
@ -481,6 +481,8 @@ static CURLcode ssh_statemach_act(struct connectdata *conn, bool *block)
int seekerr = CURL_SEEKFUNC_OK;
*block = 0; /* we're not blocking by default */
do {
switch(sshc->state) {
case SSH_S_STARTUP:
sshc->secondCreateDirs = 0;
@ -1429,9 +1431,9 @@ static CURLcode ssh_statemach_act(struct connectdata *conn, bool *block)
sshc->actualcode = err>= LIBSSH2_FX_OK?
sftp_libssh2_error_to_CURLE(err):CURLE_SSH;
if(!sshc->actualcode) {
/* Sometimes, for some reason libssh2_sftp_last_error() returns zero
even though libssh2_sftp_open() failed previously! We need to
work around that! */
/* Sometimes, for some reason libssh2_sftp_last_error() returns
zero even though libssh2_sftp_open() failed previously! We need
to work around that! */
sshc->actualcode = CURLE_SSH;
err=-1;
}
@ -1442,7 +1444,8 @@ static CURLcode ssh_statemach_act(struct connectdata *conn, bool *block)
}
}
/* If we have restart point then we need to seek to the correct position. */
/* If we have restart point then we need to seek to the correct
position. */
if(data->state.resume_from > 0) {
/* Let's read off the proper amount of bytes from the input. */
if(conn->seek_func) {
@ -1508,8 +1511,8 @@ static CURLcode ssh_statemach_act(struct connectdata *conn, bool *block)
sshc->actualcode = result;
}
else {
/* store this original bitmask setup to use later on if we can't figure
out a "real" bitmask */
/* store this original bitmask setup to use later on if we can't
figure out a "real" bitmask */
sshc->orig_waitfor = data->req.keepon;
state(conn, SSH_STOP);
@ -1552,9 +1555,9 @@ static CURLcode ssh_statemach_act(struct connectdata *conn, bool *block)
if(rc == -1) {
unsigned int sftp_err = 0;
/*
* abort if failure wasn't that the dir already exists or the
* permission was denied (creation might succeed further
* down the path) - retry on unspecific FAILURE also
* Abort if failure wasn't that the dir already exists or the
* permission was denied (creation might succeed further down the
* path) - retry on unspecific FAILURE also
*/
sftp_err = libssh2_sftp_last_error(sshc->sftp_session);
if((sftp_err != LIBSSH2_FX_FILE_ALREADY_EXISTS) &&
@ -1571,8 +1574,8 @@ static CURLcode ssh_statemach_act(struct connectdata *conn, bool *block)
case SSH_SFTP_READDIR_INIT:
/*
* This is a directory that we are trying to get, so produce a
* directory listing
* This is a directory that we are trying to get, so produce a directory
* listing
*/
sshc->sftp_handle = libssh2_sftp_opendir(sshc->sftp_session,
sftp_scp->path);
@ -1638,8 +1641,8 @@ static CURLcode ssh_statemach_act(struct connectdata *conn, bool *block)
state(conn, SSH_STOP);
break;
}
/* since this counts what we send to the client, we include the newline
in this counter */
/* since this counts what we send to the client, we include the
newline in this counter */
data->req.bytecount += sshc->readdir_len+1;
/* output debug output if that is requested */
@ -2236,6 +2239,8 @@ static CURLcode ssh_statemach_act(struct connectdata *conn, bool *block)
break;
}
} while(!rc && (sshc->state != SSH_STOP));
if(rc == LIBSSH2_ERROR_EAGAIN) {
/* we would block, we need to wait for the socket to be ready (in the
right direction too)! */