160 lines
3.7 KiB
C
160 lines
3.7 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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#include "xwait.h" // For return status codes
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#define ATTEMPTS 10
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#define ALARM_WAIT 30
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/*****************************************************************************/
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static 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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*
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* Prefix the message with a newline in case another message
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* has been partly output */
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const char msg[] = "\n<E>Timed out waiting for RandR outputs\n";
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g_file_write(1, msg, g_strlen(msg));
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exit(XW_STATUS_TIMED_OUT);
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}
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/*****************************************************************************/
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static Display *
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open_display(const char *display)
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{
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Display *dpy = NULL;
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unsigned int wait = ATTEMPTS;
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unsigned int n;
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for (n = 1; n <= ATTEMPTS; ++n)
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{
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printf("<D>Opening display %s. Attempt %u of %u\n", display, n, wait);
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dpy = XOpenDisplay(display);
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if (dpy != NULL)
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{
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printf("<D>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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return dpy;
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}
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/*****************************************************************************/
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/**
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* Wait for the RandR extension (if in use) to be available
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*
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* @param dpy Display
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* @return 0 if/when outputs are available, 1 otherwise
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*/
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static int
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wait_for_r_and_r(Display *dpy)
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{
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int error_base = 0;
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int event_base = 0;
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unsigned int outputs = 0;
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unsigned int wait = ATTEMPTS;
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unsigned int n;
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XRRScreenResources *res = NULL;
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if (!XRRQueryExtension(dpy, &event_base, &error_base))
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{
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printf("<I>RandR not supported on display %s\n",
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DisplayString(dpy));
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return 0;
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}
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for (n = 1; n <= wait; ++n)
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{
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printf("<D>Waiting for outputs. Attempt %u of %u\n", n, wait);
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res = XRRGetScreenResources(dpy, DefaultRootWindow(dpy));
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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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}
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XRRFreeScreenResources(res);
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}
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if (outputs > 0)
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{
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printf("<D>Display %s ready with %u RandR outputs\n",
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DisplayString(dpy), outputs);
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return 0;
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}
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g_sleep(1000);
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}
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printf("<E>Unable to find any RandR outputs\n");
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return 1;
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}
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/*****************************************************************************/
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static void
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usage(const char *argv0, int status)
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{
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printf("Usage: %s -d display\n", argv0);
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exit(status);
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}
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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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const char *display_name = NULL;
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int opt;
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int status = XW_STATUS_MISC_ERROR;
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Display *dpy = NULL;
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/* Disable stdout buffering so any messages are passed immediately
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* to sesman */
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setvbuf(stdout, NULL, _IONBF, 0);
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while ((opt = getopt(argc, argv, "d:")) != -1)
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{
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switch (opt)
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{
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case 'd':
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display_name = optarg;
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break;
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default: /* '?' */
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usage(argv[0], status);
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}
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}
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if (!display_name)
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{
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usage(argv[0], status);
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}
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g_set_alarm(alarm_handler, ALARM_WAIT);
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dpy = open_display(display_name);
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if (!dpy)
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{
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printf("<E>Unable to open display %s\n", display_name);
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status = XW_STATUS_FAILED_TO_START;
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}
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else
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{
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if (wait_for_r_and_r(dpy) == 0)
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{
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status = XW_STATUS_OK;
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}
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XCloseDisplay(dpy);
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}
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return status;
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}
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