add i3-dump-log, a tool to dump the SHM log
This commit is contained in:
Michael Stapelberg
parent
966c654112
commit
0af05710b2
4
Makefile
4
Makefile
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@ -18,7 +18,7 @@ else
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UNUSED:=$(shell $(MAKE) loglevels.h)
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endif
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SUBDIRS:=i3-msg i3-input i3-nagbar i3-config-wizard i3bar
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SUBDIRS:=i3-msg i3-input i3-nagbar i3-config-wizard i3bar i3-dump-log
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# Depend on the specific file (.c for each .o) and on all headers
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src/%.o: src/%.c ${HEADERS}
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@ -100,7 +100,7 @@ dist: distclean
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[ ! -e i3-${VERSION}.tar.bz2 ] || rm i3-${VERSION}.tar.bz2
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mkdir i3-${VERSION}
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cp i3-migrate-config-to-v4 i3-sensible-* i3.config.keycodes DEPENDS GOALS LICENSE PACKAGE-MAINTAINER RELEASE-NOTES-${VERSION} i3.config i3.desktop i3.welcome pseudo-doc.doxygen i3-wsbar Makefile i3-${VERSION}
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cp -r src libi3 i3-msg i3-nagbar i3-config-wizard i3bar yajl-fallback include man i3-${VERSION}
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cp -r src libi3 i3-msg i3-nagbar i3-config-wizard i3bar i3-dump-log yajl-fallback include man i3-${VERSION}
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# Only copy toplevel documentation (important stuff)
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mkdir i3-${VERSION}/docs
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# Pre-generate documentation
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@ -0,0 +1,32 @@
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# Default value so one can compile i3-dump-log standalone
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TOPDIR=..
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include $(TOPDIR)/common.mk
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CFLAGS += -I$(TOPDIR)/include
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# Depend on the object files of all source-files in src/*.c and on all header files
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FILES=$(patsubst %.c,%.o,$(wildcard *.c))
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HEADERS=$(wildcard *.h)
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# Depend on the specific file (.c for each .o) and on all headers
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%.o: %.c ${HEADERS}
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echo "[i3-dump-log] CC $<"
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$(CC) $(CPPFLAGS) $(CFLAGS) -c -o $@ $<
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all: i3-dump-log
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i3-dump-log: ${FILES}
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echo "[i3-dump-log] LINK i3-dump-log"
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$(CC) $(LDFLAGS) -o i3-dump-log ${FILES} $(LIBS)
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install: all
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echo "[i3-dump-log] INSTALL"
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$(INSTALL) -d -m 0755 $(DESTDIR)$(PREFIX)/bin
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$(INSTALL) -m 0755 i3-dump-log $(DESTDIR)$(PREFIX)/bin/
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clean:
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rm -f *.o
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distclean: clean
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rm -f i3-dump-log
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@ -0,0 +1,160 @@
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/*
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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 <i3/ipc.h>
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int main(int argc, char *argv[]) {
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char *socket_path = getenv("I3SOCK");
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int o, option_index = 0;
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int message_type = I3_IPC_MESSAGE_TYPE_GET_LOG_MARKERS;
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bool verbose = false;
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static struct option long_options[] = {
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{"socket", required_argument, 0, 's'},
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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 == 's') {
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if (socket_path != NULL)
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free(socket_path);
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socket_path = sstrdup(optarg);
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} else 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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if (socket_path == NULL)
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socket_path = socket_path_from_x11();
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/* Fall back to the default socket path */
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if (socket_path == NULL)
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socket_path = sstrdup("/tmp/i3-ipc.sock");
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int sockfd = socket(AF_LOCAL, SOCK_STREAM, 0);
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if (sockfd == -1)
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err(EXIT_FAILURE, "Could not create socket");
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struct sockaddr_un addr;
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memset(&addr, 0, sizeof(struct sockaddr_un));
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addr.sun_family = AF_LOCAL;
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strncpy(addr.sun_path, socket_path, sizeof(addr.sun_path) - 1);
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if (connect(sockfd, (const struct sockaddr*)&addr, sizeof(struct sockaddr_un)) < 0)
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err(EXIT_FAILURE, "Could not connect to i3");
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if (ipc_send_message(sockfd, 0, message_type, NULL) == -1)
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err(EXIT_FAILURE, "IPC: write()");
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uint32_t reply_length;
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uint8_t *reply;
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int ret;
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if ((ret = ipc_recv_message(sockfd, message_type, &reply_length, &reply)) != 0) {
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if (ret == -1)
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err(EXIT_FAILURE, "IPC: read()");
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exit(1);
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}
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char *buffer = NULL;
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sasprintf(&buffer, "%.*s", reply_length, reply);
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/* The reply will look like this:
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* {"offset_next_write":1729,"offset_last_wrap":1996,"size":2048,"shmname":"/i3-log-399"}
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* IMO, it’s not worth linking a JSON parser in just for this. If the
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* structure changes in the future, this decision needs to be re-evaluated
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* :). */
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int offset_next_write, offset_last_wrap, logbuffer_size;
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char *next_write_str = strstr(buffer, "offset_next_write"),
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*last_wrap_str = strstr(buffer, "offset_last_wrap"),
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*size_str = strstr(buffer, "size"),
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*shmname = strstr(buffer, "shmname");
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if (!next_write_str ||
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!last_wrap_str ||
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!size_str ||
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!shmname ||
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sscanf(next_write_str, "offset_next_write\":%d", &offset_next_write) != 1 ||
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sscanf(last_wrap_str, "offset_last_wrap\":%d", &offset_last_wrap) != 1 ||
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sscanf(size_str, "size\":%d", &logbuffer_size) != 1)
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errx(EXIT_FAILURE, "invalid IPC reply: %s\n", buffer);
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shmname += strlen("shmname\":\"");
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char *quote = strchr(shmname, '"');
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if (!quote)
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errx(EXIT_FAILURE, "invalid IPC reply: %s\n", buffer);
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*quote = '\0';
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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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offset_next_write, offset_last_wrap, logbuffer_size, shmname);
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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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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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char *logbuffer = mmap(NULL, logbuffer_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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int chars;
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char *walk = logbuffer + 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 + 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;
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while (walk < (logbuffer + 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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@ -1,6 +1,6 @@
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A2M:=a2x -f manpage --asciidoc-opts="-f asciidoc.conf"
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all: i3.1 i3-msg.1 i3-input.1 i3-nagbar.1 i3-wsbar.1 i3-config-wizard.1 i3-migrate-config-to-v4.1 i3-sensible-editor.1 i3-sensible-pager.1 i3-sensible-terminal.1
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all: i3.1 i3-msg.1 i3-input.1 i3-nagbar.1 i3-wsbar.1 i3-config-wizard.1 i3-migrate-config-to-v4.1 i3-sensible-editor.1 i3-sensible-pager.1 i3-sensible-terminal.1 i3-dump-log.1
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%.1: %.man asciidoc.conf
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${A2M} $<
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@ -9,7 +9,7 @@ i3-wsbar.1: ../i3-wsbar
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pod2man $^ > $@
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clean:
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for file in $$(echo i3 i3-msg i3-input i3-nagbar i3-wsbar i3-config-wizard i3-migrate-config-to-v4 i3-sensible-editor i3-sensible-pager i3-sensible-terminal); \
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for file in $$(echo i3 i3-msg i3-input i3-nagbar i3-wsbar i3-config-wizard i3-migrate-config-to-v4 i3-sensible-editor i3-sensible-pager i3-sensible-terminal i3-dump-log); \
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do \
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rm -f $${file}.1 $${file}.html $${file}.xml; \
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done
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@ -0,0 +1,32 @@
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i3-dump-log(1)
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==============
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Michael Stapelberg <michael+i3@stapelberg.de>
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v4.1, December 2011
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== NAME
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i3-dump-log - dumps the i3 SHM log
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== SYNOPSIS
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i3-dump-log [-s <socketpath>]
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== DESCRIPTION
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Debug versions of i3 automatically use 1% of your RAM (but 25 MiB max) to store
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full debug loglevel log output. This is extremely helpful for bugreports and
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figuring out what is going on, without permanently logging to a file.
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With i3-dump-log, you can dump the SHM log to stdout.
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== EXAMPLE
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i3-dump-log | gzip -9 > /tmp/i3-log.gz
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== SEE ALSO
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i3(1)
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== AUTHOR
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Michael Stapelberg and contributors
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