9200094203
This has multiple effects: 1) The i3 codebase is now consistently formatted. clang-format uncovered plenty of places where inconsistent code made it into our code base. 2) When writing code, you don’t need to think or worry about our coding style. Write it in yours, then run clang-format-3.5 3) When submitting patches, we don’t need to argue about coding style. The basic idea is that we don’t want to care about _how_ we write the code, but _what_ it does :). The coding style that we use is defined in the .clang-format config file and is based on the google style, but adapted in such a way that the number of modifications to the i3 code base is minimal.
187 lines
6.4 KiB
C
187 lines
6.4 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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* © 2009-2012 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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static uint32_t offset_next_write,
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wrap_count;
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static i3_shmlog_header *header;
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static char *logbuffer,
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*walk;
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static int check_for_wrap(void) {
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if (wrap_count == header->wrap_count)
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return 0;
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/* The log wrapped. Print the remaining content and reset walk to the top
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* of the log. */
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wrap_count = header->wrap_count;
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const int len = (logbuffer + header->offset_last_wrap) - walk;
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if (write(STDOUT_FILENO, walk, len) != len)
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err(EXIT_FAILURE, "write()");
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walk = logbuffer + sizeof(i3_shmlog_header);
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return 1;
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}
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static void print_till_end(void) {
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check_for_wrap();
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const int len = (logbuffer + header->offset_next_write) - walk;
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const int n = write(STDOUT_FILENO, walk, len);
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if (len != n)
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err(EXIT_FAILURE, "write()");
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if (n > 0) {
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walk += n;
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}
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}
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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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follow = 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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{"follow", no_argument, 0, 'f'},
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{"help", no_argument, 0, 'h'},
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{0, 0, 0, 0}};
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char *options_string = "s:vfVh";
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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 == 'f') {
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follow = 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 [-f] [-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", NULL, 0);
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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", conn, screen) != 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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/* NB: While we must never write, we need O_RDWR for the pthread condvar. */
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int logbuffer_shm = shm_open(shmname, O_RDWR, 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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/* NB: While we must never write, we need PROT_WRITE for the pthread condvar. */
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logbuffer = mmap(NULL, statbuf.st_size, PROT_READ | PROT_WRITE, 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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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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walk = logbuffer + header->offset_next_write;
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/* We first need to print old content in case there was at least one
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* wrapping already. */
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if (*walk != '\0') {
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/* In case there was a write to the buffer already, skip the first
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* old line, it very likely is mangled. Not a problem, though, the log
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* is chatty enough to have plenty lines left. */
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while (*walk != '\n')
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walk++;
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walk++;
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}
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/* In case there was no wrapping, this is a no-op, otherwise it prints the
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* old lines. */
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wrap_count = 0;
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check_for_wrap();
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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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print_till_end();
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if (follow) {
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/* Since pthread_cond_wait() expects a mutex, we need to provide one.
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* To not lock i3 (that’s bad, mhkay?) we just define one outside of
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* the shared memory. */
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pthread_mutex_t dummy_mutex = PTHREAD_MUTEX_INITIALIZER;
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pthread_mutex_lock(&dummy_mutex);
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while (1) {
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pthread_cond_wait(&(header->condvar), &dummy_mutex);
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/* If this was not a spurious wakeup, print the new lines. */
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if (header->offset_next_write != offset_next_write) {
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offset_next_write = header->offset_next_write;
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print_till_end();
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}
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}
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}
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return 0;
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}
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