275 lines
8.0 KiB
C
275 lines
8.0 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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* log.c: Setting of loglevels, logging functions.
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*
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*/
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <sys/time.h>
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#include <unistd.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 <errno.h>
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#include "util.h"
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#include "log.h"
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#include "i3.h"
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#include "libi3.h"
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/* loglevels.h is autogenerated at make time */
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#include "loglevels.h"
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static uint64_t loglevel = 0;
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static bool verbose = false;
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static FILE *errorfile;
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char *errorfilename;
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/* SHM logging variables */
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/* The name for the SHM (/i3-log-%pid). Will end up on /dev/shm on most
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* systems. Global so that we can clean up at exit. */
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char *shmlogname = "";
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/* Size limit for the SHM log, by default 25 MiB. Can be overwritten using the
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* flag --shmlog-size. */
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int shmlog_size = 0;
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/* If enabled, logbuffer will point to a memory mapping of the i3 SHM log. */
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static char *logbuffer;
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/* A pointer (within logbuffer) where data will be written to next. */
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static char *logwalk;
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/* A pointer to the byte where we last wrapped. Necessary to not print the
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* left-overs at the end of the ringbuffer. */
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static char *loglastwrap;
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/* Size (in bytes) of the i3 SHM log. */
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static int logbuffer_size;
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/* File descriptor for shm_open. */
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static int logbuffer_shm;
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/*
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* Initializes logging by creating an error logfile in /tmp (or
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* XDG_RUNTIME_DIR, see get_process_filename()).
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*
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* Will be called twice if --shmlog-size is specified.
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*
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*/
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void init_logging() {
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if (!errorfilename) {
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if (!(errorfilename = get_process_filename("errorlog")))
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ELOG("Could not initialize errorlog\n");
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else {
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errorfile = fopen(errorfilename, "w");
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if (fcntl(fileno(errorfile), F_SETFD, FD_CLOEXEC)) {
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ELOG("Could not set close-on-exec flag\n");
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}
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}
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}
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/* If this is a debug build (not a release version), we will enable SHM
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* logging by default, unless the user turned it off explicitly. */
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if (logbuffer == NULL && shmlog_size > 0) {
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/* Reserve 1% of the RAM for the logfile, but at max 25 MiB.
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* For 512 MiB of RAM this will lead to a 5 MiB log buffer.
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* At the moment (2011-12-10), no testcase leads to an i3 log
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* of more than ~ 600 KiB. */
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long long physical_mem_bytes = (long long)sysconf(_SC_PHYS_PAGES) *
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sysconf(_SC_PAGESIZE);
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logbuffer_size = min(physical_mem_bytes * 0.01, shmlog_size);
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sasprintf(&shmlogname, "/i3-log-%d", getpid());
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logbuffer_shm = shm_open(shmlogname, O_RDWR | O_CREAT | O_TRUNC, S_IREAD | S_IWRITE);
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if (logbuffer_shm == -1) {
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ELOG("Could not shm_open SHM segment for the i3 log: %s\n", strerror(errno));
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return;
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}
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if (ftruncate(logbuffer_shm, logbuffer_size) == -1) {
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close(logbuffer_shm);
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shm_unlink("/i3-log-");
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ELOG("Could not ftruncate SHM segment for the i3 log: %s\n", strerror(errno));
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return;
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}
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logbuffer = mmap(NULL, logbuffer_size, PROT_READ | PROT_WRITE, MAP_SHARED, logbuffer_shm, 0);
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if (logbuffer == MAP_FAILED) {
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close(logbuffer_shm);
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shm_unlink("/i3-log-");
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ELOG("Could not mmap SHM segment for the i3 log: %s\n", strerror(errno));
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logbuffer = NULL;
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return;
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}
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logwalk = logbuffer;
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loglastwrap = logbuffer + logbuffer_size;
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}
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}
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/*
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* Set verbosity of i3. If verbose is set to true, informative messages will
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* be printed to stdout. If verbose is set to false, only errors will be
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* printed.
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*
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*/
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void set_verbosity(bool _verbose) {
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verbose = _verbose;
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}
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/*
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* Enables the given loglevel.
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*
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*/
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void add_loglevel(const char *level) {
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/* Handle the special loglevel "all" */
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if (strcasecmp(level, "all") == 0) {
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loglevel = UINT64_MAX;
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return;
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}
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for (int i = 0; i < sizeof(loglevels) / sizeof(char*); i++) {
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if (strcasecmp(loglevels[i], level) != 0)
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continue;
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/* The position in the array (plus one) is the amount of times
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* which we need to shift 1 to the left to get our bitmask for
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* the specific loglevel. */
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loglevel |= (1 << (i+1));
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break;
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}
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}
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/*
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* Returns the offsets for the next write and for the last wrap.
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* Necessary to print the i3 SHM log in the correct order.
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*
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*/
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void get_log_markers(int *offset_next_write, int *offset_last_wrap, int *size) {
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*offset_next_write = (logwalk - logbuffer);
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*offset_last_wrap = (loglastwrap - logbuffer);
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*size = logbuffer_size;
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}
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/*
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* Logs the given message to stdout (if print is true) while prefixing the
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* current time to it. Additionally, the message will be saved in the i3 SHM
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* log if enabled.
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* This is to be called by *LOG() which includes filename/linenumber/function.
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*
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*/
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static void vlog(const bool print, const char *fmt, va_list args) {
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/* Precisely one page to not consume too much memory but to hold enough
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* data to be useful. */
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static char message[4096];
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static struct tm result;
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static time_t t;
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static struct tm *tmp;
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static size_t len;
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/* Get current time */
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t = time(NULL);
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/* Convert time to local time (determined by the locale) */
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tmp = localtime_r(&t, &result);
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/* Generate time prefix */
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len = strftime(message, sizeof(message), "%x %X - ", tmp);
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/*
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* logbuffer print
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* ----------------
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* true true format message, save, print
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* true false format message, save
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* false true print message only
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* false false INVALID, never called
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*/
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if (!logbuffer) {
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#ifdef DEBUG_TIMING
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struct timeval tv;
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gettimeofday(&tv, NULL);
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printf("%s%d.%d - ", message, tv.tv_sec, tv.tv_usec);
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#else
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printf("%s", message);
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#endif
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vprintf(fmt, args);
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} else {
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len += vsnprintf(message + len, sizeof(message) - len, fmt, args);
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if (len < 0 ) {
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fprintf(stderr, "BUG: something is overflowing here. Dropping the log entry\n");
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return;
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}
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if (len >= sizeof(message)) {
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fprintf(stderr, "BUG: single log message > 4k\n");
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}
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/* If there is no space for the current message (plus trailing
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* nullbyte) in the ringbuffer, we need to wrap and write to the
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* beginning again. */
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if ((len+1) >= (logbuffer_size - (logwalk - logbuffer))) {
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loglastwrap = logwalk;
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logwalk = logbuffer;
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}
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/* Copy the buffer, terminate it, move the write pointer to the byte after
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* our current message. */
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strncpy(logwalk, message, len);
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logwalk[len] = '\0';
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logwalk += len + 1;
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if (print)
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fwrite(message, len, 1, stdout);
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}
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}
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/*
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* Logs the given message to stdout while prefixing the current time to it,
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* but only if verbose mode is activated.
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*
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*/
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void verboselog(char *fmt, ...) {
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va_list args;
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if (!logbuffer && !verbose)
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return;
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va_start(args, fmt);
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vlog(verbose, fmt, args);
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va_end(args);
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}
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/*
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* Logs the given message to stdout while prefixing the current time to it.
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*
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*/
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void errorlog(char *fmt, ...) {
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va_list args;
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va_start(args, fmt);
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vlog(true, fmt, args);
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va_end(args);
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/* also log to the error logfile, if opened */
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va_start(args, fmt);
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vfprintf(errorfile, fmt, args);
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fflush(errorfile);
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va_end(args);
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}
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/*
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* Logs the given message to stdout while prefixing the current time to it,
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* but only if the corresponding debug loglevel was activated.
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* This is to be called by DLOG() which includes filename/linenumber
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*
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*/
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void debuglog(uint64_t lev, char *fmt, ...) {
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va_list args;
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if (!logbuffer && !(loglevel & lev))
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return;
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va_start(args, fmt);
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vlog((loglevel & lev), fmt, args);
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va_end(args);
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}
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