102 lines
2.2 KiB
C
102 lines
2.2 KiB
C
#include <X11/extensions/Xrandr.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/signal.h>
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#include <unistd.h>
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#include "config_ac.h"
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#include "os_calls.h"
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#include "string_calls.h"
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#define ATTEMPTS 10
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#define ALARM_WAIT 30
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void
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alarm_handler(int signal_num)
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{
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/* Avoid printf() in signal handler (see signal-safety(7)) */
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const char msg[] = "Timed out waiting for RandR outputs\n";
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g_file_write(1, msg, g_strlen(msg));
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exit(1);
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}
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int
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main(int argc, char **argv)
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{
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char *display = NULL;
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int error_base = 0;
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int event_base = 0;
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int n = 0;
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int outputs = 0;
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int wait = ATTEMPTS;
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Display *dpy = NULL;
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XRRScreenResources *res = NULL;
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display = getenv("DISPLAY");
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g_set_alarm(alarm_handler, ALARM_WAIT);
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if (!display)
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{
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printf("DISPLAY is null");
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exit(1);
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}
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for (n = 1; n <= wait; ++n)
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{
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dpy = XOpenDisplay(display);
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printf("Opening display %s. Attempt %d of %d\n", display, n, wait);
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if (dpy != NULL)
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{
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printf("Opened display %s\n", display);
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break;
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}
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g_sleep(1000);
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}
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if (!dpy)
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{
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printf("Unable to open display %s\n", display);
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exit(1);
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}
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if (!XRRQueryExtension(dpy, &event_base, &error_base))
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{
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printf("RandR not supported on display %s", display);
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}
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else
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{
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for (n = 1; n <= wait; ++n)
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{
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res = XRRGetScreenResources(dpy, DefaultRootWindow(dpy));
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printf("Waiting for outputs. Attempt %d of %d\n", n, wait);
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if (res != NULL)
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{
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if (res->noutput > 0)
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{
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outputs = res->noutput;
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XRRFreeScreenResources(res);
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printf("Found %d output[s]\n", outputs);
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break;
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}
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XRRFreeScreenResources(res);
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}
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g_sleep(1000);
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}
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if (outputs > 0)
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{
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printf("display %s ready with %d outputs\n", display, res->noutput);
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}
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else
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{
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printf("Unable to find any outputs\n");
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exit(1);
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}
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}
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exit(0);
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}
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