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-rw-r--r--src/cg-base.c116
1 files changed, 112 insertions, 4 deletions
diff --git a/src/cg-base.c b/src/cg-base.c
index 95ded72..e6eef1a 100644
--- a/src/cg-base.c
+++ b/src/cg-base.c
@@ -23,6 +23,7 @@
#include <alloca.h>
#include <errno.h>
#include <inttypes.h>
+#include <poll.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
@@ -137,12 +138,109 @@ static int list_crtcs(void)
/**
* Fill the list of CRTC information
*
- * @return Zero on success, -1 on libcoopgamma error
+ * @return Zero on success, -1 on error, -2
+ * on libcoopgamma error
*/
static int get_crtc_info(void)
{
- /* TODO */
+ size_t i, unsynced = 0, selected;
+ libcoopgamma_async_context_t* async;
+ char* synced;
+ int saved_errno, need_flush = 0, fail_rc = -1;
+ struct pollfd pollfd;
+
+ async = alloca(crtcs_n * sizeof(*async));
+ synced = alloca(crtcs_n * sizeof(*synced));
+ for (i = 0; i < crtcs_n; i++)
+ if (libcoopgamma_async_context_initialise(async + i) < 0)
+ return -1;
+ memset(synced, 0, crtcs_n * sizeof(*synced));
+
+ i = 0;
+ pollfd.fd = cg.fd;
+ pollfd.events = POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI;
+
+ for (;;)
+ {
+ wait:
+ if (i < crtcs_n)
+ pollfd.events |= POLLOUT;
+ else
+ pollfd.events &= ~POLLOUT;
+
+ if (poll(&pollfd, (nfds_t)1, -1) < 0)
+ goto fail;
+
+ if (pollfd.revents & (POLLOUT | POLLERR | POLLHUP | POLLNVAL))
+ {
+ if (need_flush && (libcoopgamma_flush(&cg) < 0))
+ goto send_fail;
+ need_flush = 0;
+ for (; i < crtcs_n; i++)
+ if (unsynced++, libcoopgamma_get_gamma_info_send(crtcs[i], &cg, async + i) < 0)
+ goto send_fail;
+ goto send_done;
+ send_fail:
+ switch (errno)
+ {
+ case EINTR:
+ case EAGAIN:
+#if EAGAIN != EWOULDBLOCK
+ case EWOULDBLOCK:
+#endif
+ i++;
+ need_flush = 1;
+ break;
+ default:
+ goto fail;
+ }
+ }
+ send_done:
+
+ if (unsynced == 0)
+ break;
+
+ if (pollfd.revents & (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI))
+ while (unsynced > 0)
+ switch (libcoopgamma_synchronise(&cg, async, i, &selected))
+ {
+ case 0:
+ if (synced[selected])
+ break;
+ synced[selected] = 1;
+ unsynced -= 1;
+ if (libcoopgamma_get_gamma_info_recv(crtc_info + selected, &cg, async + selected) < 0)
+ goto cg_fail;
+ break;
+ case -1:
+ switch (errno)
+ {
+ case 0:
+ break;
+ case EINTR:
+ case EAGAIN:
+#if EAGAIN != EWOULDBLOCK
+ case EWOULDBLOCK:
+#endif
+ goto wait;
+ default:
+ goto fail;
+ }
+ break;
+ }
+ }
+
+ for (i = 0; i < crtcs_n; i++)
+ libcoopgamma_async_context_destroy(async + i);
return 0;
+ cg_fail:
+ fail_rc = -2;
+ fail:
+ saved_errno = errno;
+ for (i = 0; i < crtcs_n; i++)
+ libcoopgamma_async_context_destroy(async + i);
+ errno = saved_errno;
+ return fail_rc;
}
@@ -286,8 +384,18 @@ int main(int argc, char* argv[])
if (libcoopgamma_crtc_info_initialise(crtc_info + crtcs_i) < 0)
goto cg_fail;
- if (get_crtc_info() < 0)
- goto cg_fail;
+ if (libcoopgamma_set_nonblocking(&cg, 1) < 0)
+ goto fail;
+
+ switch (get_crtc_info())
+ {
+ case 0:
+ break;
+ case -1:
+ goto fail;
+ case -2:
+ goto cg_fail;
+ }
/* TODO start */