2 * vim:ts=4:sw=4:expandtab
4 * i3 - an improved dynamic tiling window manager
5 * © 2009-2011 Michael Stapelberg and contributors (see also: LICENSE)
7 * i3-dump-log/main.c: Dumps the i3 SHM log to stdout.
12 #include <sys/types.h>
13 #include <sys/socket.h>
31 int main(int argc, char *argv[]) {
32 int o, option_index = 0;
35 static struct option long_options[] = {
36 {"version", no_argument, 0, 'v'},
37 {"verbose", no_argument, 0, 'V'},
38 {"help", no_argument, 0, 'h'},
42 char *options_string = "s:vVh";
44 while ((o = getopt_long(argc, argv, options_string, long_options, &option_index)) != -1) {
46 printf("i3-dump-log " I3_VERSION "\n");
48 } else if (o == 'V') {
50 } else if (o == 'h') {
51 printf("i3-dump-log " I3_VERSION "\n");
52 printf("i3-dump-log [-s <socket>]\n");
57 char *shmname = root_atom_contents("I3_SHMLOG_PATH");
59 errx(EXIT_FAILURE, "Cannot get I3_SHMLOG_PATH atom contents. Is i3 running on this display?");
62 errx(EXIT_FAILURE, "Cannot dump log: SHM logging is disabled in i3.");
66 int logbuffer_shm = shm_open(shmname, O_RDONLY, 0);
67 if (logbuffer_shm == -1)
68 err(EXIT_FAILURE, "Could not shm_open SHM segment for the i3 log (%s)", shmname);
70 if (fstat(logbuffer_shm, &statbuf) != 0)
71 err(EXIT_FAILURE, "stat(%s)", shmname);
73 char *logbuffer = mmap(NULL, statbuf.st_size, PROT_READ, MAP_SHARED, logbuffer_shm, 0);
74 if (logbuffer == MAP_FAILED)
75 err(EXIT_FAILURE, "Could not mmap SHM segment for the i3 log");
77 i3_shmlog_header *header = (i3_shmlog_header*)logbuffer;
80 printf("next_write = %d, last_wrap = %d, logbuffer_size = %d, shmname = %s\n",
81 header->offset_next_write, header->offset_last_wrap, header->size, shmname);
83 char *walk = logbuffer + header->offset_next_write;
84 /* Skip the first line, it very likely is mangled. Not a problem, though,
85 * the log is chatty enough to have plenty lines left. */
89 /* Print the oldest log lines. We use printf("%s") to stop on \0. */
90 while (walk < (logbuffer + header->offset_last_wrap)) {
91 chars = printf("%s", walk);
92 /* Shortcut: If there are two consecutive \0 bytes, this part of the
93 * buffer was never touched. To not call printf() for every byte of the
94 * buffer, we directly exit the loop. */
95 if (*walk == '\0' && *(walk+1) == '\0')
97 walk += (chars > 0 ? chars : 1);
100 /* Then start from the beginning and print the newer lines */
101 walk = logbuffer + sizeof(i3_shmlog_header);
102 while (walk < (logbuffer + header->offset_next_write)) {
103 chars = printf("%s", walk);
104 walk += (chars > 0 ? chars : 1);