--- /dev/null
+/*
+ * vim:ts=4:sw=4:expandtab
+ *
+ * i3 - an improved dynamic tiling window manager
+ * © 2009-2011 Michael Stapelberg and contributors (see also: LICENSE)
+ *
+ * i3-dump-log/main.c: Dumps the i3 SHM log to stdout.
+ *
+ */
+#include <stdio.h>
+#include <stdbool.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <err.h>
+#include <stdint.h>
+#include <getopt.h>
+#include <limits.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+
+#include "libi3.h"
+#include <i3/ipc.h>
+
+int main(int argc, char *argv[]) {
+ char *socket_path = getenv("I3SOCK");
+ int o, option_index = 0;
+ int message_type = I3_IPC_MESSAGE_TYPE_GET_LOG_MARKERS;
+ bool verbose = false;
+
+ static struct option long_options[] = {
+ {"socket", required_argument, 0, 's'},
+ {"version", no_argument, 0, 'v'},
+ {"verbose", no_argument, 0, 'V'},
+ {"help", no_argument, 0, 'h'},
+ {0, 0, 0, 0}
+ };
+
+ char *options_string = "s:vVh";
+
+ while ((o = getopt_long(argc, argv, options_string, long_options, &option_index)) != -1) {
+ if (o == 's') {
+ if (socket_path != NULL)
+ free(socket_path);
+ socket_path = sstrdup(optarg);
+ } else if (o == 'v') {
+ printf("i3-dump-log " I3_VERSION "\n");
+ return 0;
+ } else if (o == 'V') {
+ verbose = true;
+ } else if (o == 'h') {
+ printf("i3-dump-log " I3_VERSION "\n");
+ printf("i3-dump-log [-s <socket>]\n");
+ return 0;
+ }
+ }
+
+ if (socket_path == NULL)
+ socket_path = socket_path_from_x11();
+
+ /* Fall back to the default socket path */
+ if (socket_path == NULL)
+ socket_path = sstrdup("/tmp/i3-ipc.sock");
+
+ int sockfd = socket(AF_LOCAL, SOCK_STREAM, 0);
+ if (sockfd == -1)
+ err(EXIT_FAILURE, "Could not create socket");
+
+ struct sockaddr_un addr;
+ memset(&addr, 0, sizeof(struct sockaddr_un));
+ addr.sun_family = AF_LOCAL;
+ strncpy(addr.sun_path, socket_path, sizeof(addr.sun_path) - 1);
+ if (connect(sockfd, (const struct sockaddr*)&addr, sizeof(struct sockaddr_un)) < 0)
+ err(EXIT_FAILURE, "Could not connect to i3");
+
+ if (ipc_send_message(sockfd, 0, message_type, NULL) == -1)
+ err(EXIT_FAILURE, "IPC: write()");
+
+ uint32_t reply_length;
+ uint8_t *reply;
+ int ret;
+ if ((ret = ipc_recv_message(sockfd, message_type, &reply_length, &reply)) != 0) {
+ if (ret == -1)
+ err(EXIT_FAILURE, "IPC: read()");
+ exit(1);
+ }
+ char *buffer = NULL;
+ sasprintf(&buffer, "%.*s", reply_length, reply);
+ /* The reply will look like this:
+ * {"offset_next_write":1729,"offset_last_wrap":1996,"size":2048,"shmname":"/i3-log-399"}
+ * IMO, it’s not worth linking a JSON parser in just for this. If the
+ * structure changes in the future, this decision needs to be re-evaluated
+ * :). */
+ int offset_next_write, offset_last_wrap, logbuffer_size;
+ char *next_write_str = strstr(buffer, "offset_next_write"),
+ *last_wrap_str = strstr(buffer, "offset_last_wrap"),
+ *size_str = strstr(buffer, "size"),
+ *shmname = strstr(buffer, "shmname");
+ if (!next_write_str ||
+ !last_wrap_str ||
+ !size_str ||
+ !shmname ||
+ sscanf(next_write_str, "offset_next_write\":%d", &offset_next_write) != 1 ||
+ sscanf(last_wrap_str, "offset_last_wrap\":%d", &offset_last_wrap) != 1 ||
+ sscanf(size_str, "size\":%d", &logbuffer_size) != 1)
+ errx(EXIT_FAILURE, "invalid IPC reply: %s\n", buffer);
+
+ shmname += strlen("shmname\":\"");
+ char *quote = strchr(shmname, '"');
+ if (!quote)
+ errx(EXIT_FAILURE, "invalid IPC reply: %s\n", buffer);
+ *quote = '\0';
+
+ if (verbose)
+ printf("next_write = %d, last_wrap = %d, logbuffer_size = %d, shmname = %s\n",
+ offset_next_write, offset_last_wrap, logbuffer_size, shmname);
+
+ if (*shmname == '\0')
+ errx(EXIT_FAILURE, "Cannot dump log: SHM logging is disabled in i3.");
+
+ int logbuffer_shm = shm_open(shmname, O_RDONLY, 0);
+ if (logbuffer_shm == -1)
+ err(EXIT_FAILURE, "Could not shm_open SHM segment for the i3 log (%s)", shmname);
+
+ char *logbuffer = mmap(NULL, logbuffer_size, PROT_READ, MAP_SHARED, logbuffer_shm, 0);
+ if (logbuffer == MAP_FAILED)
+ err(EXIT_FAILURE, "Could not mmap SHM segment for the i3 log");
+
+ int chars;
+ char *walk = logbuffer + offset_next_write;
+ /* Skip the first line, it very likely is mangled. Not a problem, though,
+ * the log is chatty enough to have plenty lines left. */
+ while (*walk != '\0')
+ walk++;
+
+ /* Print the oldest log lines. We use printf("%s") to stop on \0. */
+ while (walk < (logbuffer + offset_last_wrap)) {
+ chars = printf("%s", walk);
+ /* Shortcut: If there are two consecutive \0 bytes, this part of the
+ * buffer was never touched. To not call printf() for every byte of the
+ * buffer, we directly exit the loop. */
+ if (*walk == '\0' && *(walk+1) == '\0')
+ break;
+ walk += (chars > 0 ? chars : 1);
+ }
+
+ /* Then start from the beginning and print the newer lines */
+ walk = logbuffer;
+ while (walk < (logbuffer + offset_next_write)) {
+ chars = printf("%s", walk);
+ walk += (chars > 0 ? chars : 1);
+ }
+
+ return 0;
+}
projects / i3 / i3 / commitdiff