136 lines
4.8 KiB
C
136 lines
4.8 KiB
C
/*
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* vim:ts=4:sw=4:expandtab
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*
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* i3 - an improved dynamic tiling window manager
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* © 2009-2011 Michael Stapelberg and contributors (see also: LICENSE)
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*
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* i3-dump-log/main.c: Dumps the i3 SHM log to stdout.
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*
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*/
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#include <stdio.h>
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#include <stdbool.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <err.h>
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#include <stdint.h>
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#include <getopt.h>
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#include <limits.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include "libi3.h"
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#include "shmlog.h"
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#include <i3/ipc.h>
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int main(int argc, char *argv[]) {
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int o, option_index = 0;
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bool verbose = false;
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static struct option long_options[] = {
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{"version", no_argument, 0, 'v'},
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{"verbose", no_argument, 0, 'V'},
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{"help", no_argument, 0, 'h'},
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{0, 0, 0, 0}
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};
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char *options_string = "s:vVh";
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while ((o = getopt_long(argc, argv, options_string, long_options, &option_index)) != -1) {
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if (o == 'v') {
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printf("i3-dump-log " I3_VERSION "\n");
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return 0;
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} else if (o == 'V') {
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verbose = true;
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} else if (o == 'h') {
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printf("i3-dump-log " I3_VERSION "\n");
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printf("i3-dump-log [-s <socket>]\n");
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return 0;
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}
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}
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char *shmname = root_atom_contents("I3_SHMLOG_PATH");
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if (shmname == NULL) {
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/* Something failed. Let’s invest a little effort to find out what it
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* is. This is hugely helpful for users who want to debug i3 but are
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* not used to the procedure yet. */
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xcb_connection_t *conn;
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int screen;
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if ((conn = xcb_connect(NULL, &screen)) == NULL ||
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xcb_connection_has_error(conn)) {
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fprintf(stderr, "i3-dump-log: ERROR: Cannot connect to X11.\n\n");
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if (getenv("DISPLAY") == NULL) {
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fprintf(stderr, "Your DISPLAY environment variable is not set.\n");
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fprintf(stderr, "Are you running i3-dump-log via SSH or on a virtual console?\n");
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fprintf(stderr, "Try DISPLAY=:0 i3-dump-log\n");
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exit(1);
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}
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fprintf(stderr, "FYI: The DISPLAY environment variable is set to \"%s\".\n", getenv("DISPLAY"));
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exit(1);
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}
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if (root_atom_contents("I3_CONFIG_PATH") != NULL) {
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fprintf(stderr, "i3-dump-log: ERROR: i3 is running, but SHM logging is not enabled.\n\n");
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if (!is_debug_build()) {
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fprintf(stderr, "You seem to be using a release version of i3:\n %s\n\n", I3_VERSION);
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fprintf(stderr, "Release versions do not use SHM logging by default,\ntherefore i3-dump-log does not work.\n\n");
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fprintf(stderr, "Please follow this guide instead:\nhttp://i3wm.org/docs/debugging-release-version.html\n");
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exit(1);
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}
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}
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errx(EXIT_FAILURE, "Cannot get I3_SHMLOG_PATH atom contents. Is i3 running on this display?");
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}
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if (*shmname == '\0')
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errx(EXIT_FAILURE, "Cannot dump log: SHM logging is disabled in i3.");
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struct stat statbuf;
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int logbuffer_shm = shm_open(shmname, O_RDONLY, 0);
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if (logbuffer_shm == -1)
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err(EXIT_FAILURE, "Could not shm_open SHM segment for the i3 log (%s)", shmname);
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if (fstat(logbuffer_shm, &statbuf) != 0)
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err(EXIT_FAILURE, "stat(%s)", shmname);
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char *logbuffer = mmap(NULL, statbuf.st_size, PROT_READ, MAP_SHARED, logbuffer_shm, 0);
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if (logbuffer == MAP_FAILED)
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err(EXIT_FAILURE, "Could not mmap SHM segment for the i3 log");
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i3_shmlog_header *header = (i3_shmlog_header*)logbuffer;
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if (verbose)
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printf("next_write = %d, last_wrap = %d, logbuffer_size = %d, shmname = %s\n",
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header->offset_next_write, header->offset_last_wrap, header->size, shmname);
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int chars;
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char *walk = logbuffer + header->offset_next_write;
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/* Skip the first line, it very likely is mangled. Not a problem, though,
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* the log is chatty enough to have plenty lines left. */
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while (*walk != '\0')
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walk++;
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/* Print the oldest log lines. We use printf("%s") to stop on \0. */
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while (walk < (logbuffer + header->offset_last_wrap)) {
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chars = printf("%s", walk);
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/* Shortcut: If there are two consecutive \0 bytes, this part of the
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* buffer was never touched. To not call printf() for every byte of the
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* buffer, we directly exit the loop. */
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if (*walk == '\0' && *(walk+1) == '\0')
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break;
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walk += (chars > 0 ? chars : 1);
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}
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/* Then start from the beginning and print the newer lines */
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walk = logbuffer + sizeof(i3_shmlog_header);
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while (walk < (logbuffer + header->offset_next_write)) {
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chars = printf("%s", walk);
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walk += (chars > 0 ? chars : 1);
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}
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return 0;
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}
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