On Tue, 2005-03-08 at 21:56, Markus Lausser wrote:
> Hello,
>
> i get the message
> *** GLib *** : poll(2) failed due to: Invalid argument.
> thousand times when running my application.
> It seems that it happens if i have accepted 100 < x < 200
> tcp connection from which i listen for input.
>
> What can i do? I am using glib 2.6.0 on a linux system.
I've did some investigation, and it appears that glib runs into
an endless loop when it tries to poll more than 256 fds at once.
I've written a short test program which reproduces this behaviour
on my system. Can anyone verify this?
The Program:
------------
#include <stdlib.h>
#include <glib.h>
static GMainLoop* MainLoop = NULL;
static gboolean
io_invoke(GIOChannel* source, GIOCondition condition,
gpointer data) {
int* num = data;
(void)source;
(void)condition;
g_log("TEST", G_LOG_LEVEL_DEBUG, "io invoke called %d", *num);
*num = *num-1;
return FALSE;
}
static gboolean add_channels(int* num) {
int i1;
g_log("TEST", G_LOG_LEVEL_DEBUG, "adding %d channels", *num);
for (i1 = 0; i1 < *num; i1++) {
GIOChannel* channel = g_io_channel_unix_new(0);
g_io_add_watch_full(channel, G_PRIORITY_DEFAULT,
G_IO_IN | G_IO_HUP | G_IO_ERR,
io_invoke, num, NULL);
}
return FALSE;
}
static gboolean end_program() {
g_log("TEST", G_LOG_LEVEL_DEBUG, "ending program");
g_main_loop_quit(MainLoop);
return FALSE;
}
int main(int argc, char** argv) {
int num;
if (argc != 2) {
g_log("TEST", G_LOG_LEVEL_WARNING,
"one integer argument required");
return -1;
}
num = atoi(argv[1]);
MainLoop = g_main_loop_new(NULL, FALSE);
g_timeout_add(1000, (GSourceFunc)add_channels, &num);
g_timeout_add(10000, (GSourceFunc)end_program, NULL);
g_main_loop_run(MainLoop);
return 0;
}
-------------
Compile:
$ gcc -Wall `pkg-config --cflags --libs glib-2.0` main.c -o test
run without problems: ./test 256
run with endless loop: ./test 257
Markus.
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