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fsp: Comments about interprocess communication.

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This commit is contained in:
Kalle Olavi Niemitalo 2007-03-05 19:32:55 +02:00 committed by Kalle Olavi Niemitalo
parent e34d646f1a
commit 136ff42bb1
1 changed files with 29 additions and 2 deletions
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31
src/protocol/fsp/fsp.c
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@ -64,7 +64,34 @@ struct module fsp_protocol_module = struct_module(
);
/* FSP synchronous connection management: */
/* Because functions of fsplib block waiting for a response from the
* server, and ELinks wants non-blocking operations so that other
* connections and the user interface keep working, this FSP protocol
* module forks a child process for each FSP connection. The child
* process writes the results to two pipes, which the main ELinks
* process then reads in a non-blocking fashion. The child process
* gets these pipes as its stdout and stderr.
*
* - If an error occurs, the child process writes "text/x-error"
* without newline to stderr, and an error code and a newline to
* stdout. The error code is either from errno or a negated value
* from enum connection_state, e.g. -S_OUT_OF_MEM. In particular,
* EPERM causes the parent process to prompt for username and
* password. (In this, fsplib differs from libsmbclient, which uses
* EACCES if authentication fails.)
*
* - If the resource is a regular file, the child process writes the
* estimated length of the file (in bytes) and a newline to stderr,
* and the contents of the file to stdout.
*
* - If the resource is a directory, the child process writes
* "text/html" without newline to stderr, and an HTML rendering
* of the directory listing to stdout.
*
* The exit code of the child process also indicates whether an error
* occurred, but the parent process ignores it. */
/* FSP synchronous connection management (child process): */
/* FIXME: Although it is probably not so much an issue, check if writes to
* stdout fails for directory listing like we do for file fetching. */
@ -249,7 +276,7 @@ prompt_username_pw(struct connection *conn)
}
/* FSP asynchronous connection management: */
/* FSP asynchronous connection management (parent process): */
static void
fsp_got_error(struct socket *socket, struct read_buffer *rb)