X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=src%2Flog.c;h=fd98081bf01a92113391971ee2e1eaaca8d8bbbb;hb=54222d56172fa014f4bed262b8efd06694a839e9;hp=22b7fffe8774986b63fabce036f0cbfcde597cc0;hpb=2728c0246794df9eae0a12d77f32d7bd0031df6f;p=i3%2Fi3 diff --git a/src/log.c b/src/log.c index 22b7fffe..fd98081b 100644 --- a/src/log.c +++ b/src/log.c @@ -2,12 +2,9 @@ * vim:ts=4:sw=4:expandtab * * i3 - an improved dynamic tiling window manager + * © 2009-2011 Michael Stapelberg and contributors (see also: LICENSE) * - * © 2009-2010 Michael Stapelberg and contributors - * - * See file LICENSE for license information. - * - * src/log.c: handles the setting of loglevels, contains the logging functions. + * log.c: Setting of loglevels, logging functions. * */ #include @@ -16,31 +13,115 @@ #include #include #include +#include +#include +#include +#include +#include #include "util.h" #include "log.h" +#include "i3.h" +#include "libi3.h" +#include "shmlog.h" /* loglevels.h is autogenerated at make time */ #include "loglevels.h" static uint64_t loglevel = 0; -static bool verbose = true; +static bool verbose = false; static FILE *errorfile; char *errorfilename; +/* SHM logging variables */ + +/* The name for the SHM (/i3-log-%pid). Will end up on /dev/shm on most + * systems. Global so that we can clean up at exit. */ +char *shmlogname = ""; +/* Size limit for the SHM log, by default 25 MiB. Can be overwritten using the + * flag --shmlog-size. */ +int shmlog_size = 0; +/* If enabled, logbuffer will point to a memory mapping of the i3 SHM log. */ +static char *logbuffer; +/* A pointer (within logbuffer) where data will be written to next. */ +static char *logwalk; +/* A pointer to the byte where we last wrapped. Necessary to not print the + * left-overs at the end of the ringbuffer. */ +static char *loglastwrap; +/* Size (in bytes) of the i3 SHM log. */ +static int logbuffer_size; +/* File descriptor for shm_open. */ +static int logbuffer_shm; + +/* + * Writes the offsets for the next write and for the last wrap to the + * shmlog_header. + * Necessary to print the i3 SHM log in the correct order. + * + */ +static void store_log_markers(void) { + i3_shmlog_header *header = (i3_shmlog_header*)logbuffer; + + header->offset_next_write = (logwalk - logbuffer); + header->offset_last_wrap = (loglastwrap - logbuffer); + header->size = logbuffer_size; +} + /* * Initializes logging by creating an error logfile in /tmp (or * XDG_RUNTIME_DIR, see get_process_filename()). * + * Will be called twice if --shmlog-size is specified. + * */ -void init_logging() { - errorfilename = get_process_filename("errorlog"); - if (errorfilename == NULL) { - ELOG("Could not initialize errorlog\n"); - return; +void init_logging(void) { + if (!errorfilename) { + if (!(errorfilename = get_process_filename("errorlog"))) + ELOG("Could not initialize errorlog\n"); + else { + errorfile = fopen(errorfilename, "w"); + if (fcntl(fileno(errorfile), F_SETFD, FD_CLOEXEC)) { + ELOG("Could not set close-on-exec flag\n"); + } + } } - errorfile = fopen(errorfilename, "w"); + /* If this is a debug build (not a release version), we will enable SHM + * logging by default, unless the user turned it off explicitly. */ + if (logbuffer == NULL && shmlog_size > 0) { + /* Reserve 1% of the RAM for the logfile, but at max 25 MiB. + * For 512 MiB of RAM this will lead to a 5 MiB log buffer. + * At the moment (2011-12-10), no testcase leads to an i3 log + * of more than ~ 600 KiB. */ + long long physical_mem_bytes = (long long)sysconf(_SC_PHYS_PAGES) * + sysconf(_SC_PAGESIZE); + logbuffer_size = min(physical_mem_bytes * 0.01, shmlog_size); + sasprintf(&shmlogname, "/i3-log-%d", getpid()); + logbuffer_shm = shm_open(shmlogname, O_RDWR | O_CREAT | O_TRUNC, S_IREAD | S_IWRITE); + if (logbuffer_shm == -1) { + ELOG("Could not shm_open SHM segment for the i3 log: %s\n", strerror(errno)); + return; + } + + if (ftruncate(logbuffer_shm, logbuffer_size) == -1) { + close(logbuffer_shm); + shm_unlink("/i3-log-"); + ELOG("Could not ftruncate SHM segment for the i3 log: %s\n", strerror(errno)); + return; + } + + logbuffer = mmap(NULL, logbuffer_size, PROT_READ | PROT_WRITE, MAP_SHARED, logbuffer_shm, 0); + if (logbuffer == MAP_FAILED) { + close(logbuffer_shm); + shm_unlink("/i3-log-"); + ELOG("Could not mmap SHM segment for the i3 log: %s\n", strerror(errno)); + logbuffer = NULL; + return; + } + logwalk = logbuffer + sizeof(i3_shmlog_header); + loglastwrap = logbuffer + logbuffer_size; + store_log_markers(); + } } /* @@ -77,27 +158,75 @@ void add_loglevel(const char *level) { } /* - * Logs the given message to stdout while prefixing the current time to it. + * Logs the given message to stdout (if print is true) while prefixing the + * current time to it. Additionally, the message will be saved in the i3 SHM + * log if enabled. * This is to be called by *LOG() which includes filename/linenumber/function. * */ -void vlog(char *fmt, va_list args) { - char timebuf[64]; +static void vlog(const bool print, const char *fmt, va_list args) { + /* Precisely one page to not consume too much memory but to hold enough + * data to be useful. */ + static char message[4096]; + static struct tm result; + static time_t t; + static struct tm *tmp; + static size_t len; /* Get current time */ - time_t t = time(NULL); + t = time(NULL); /* Convert time to local time (determined by the locale) */ - struct tm *tmp = localtime(&t); + tmp = localtime_r(&t, &result); /* Generate time prefix */ - strftime(timebuf, sizeof(timebuf), "%x %X - ", tmp); + len = strftime(message, sizeof(message), "%x %X - ", tmp); + + /* + * logbuffer print + * ---------------- + * true true format message, save, print + * true false format message, save + * false true print message only + * false false INVALID, never called + */ + if (!logbuffer) { #ifdef DEBUG_TIMING - struct timeval tv; - gettimeofday(&tv, NULL); - printf("%s%d.%d - ", timebuf, tv.tv_sec, tv.tv_usec); + struct timeval tv; + gettimeofday(&tv, NULL); + printf("%s%d.%d - ", message, tv.tv_sec, tv.tv_usec); #else - printf("%s", timebuf); + printf("%s", message); #endif - vprintf(fmt, args); + vprintf(fmt, args); + } else { + len += vsnprintf(message + len, sizeof(message) - len, fmt, args); + if (len < 0 ) { + fprintf(stderr, "BUG: something is overflowing here. Dropping the log entry\n"); + return; + } + + if (len >= sizeof(message)) { + fprintf(stderr, "BUG: single log message > 4k\n"); + } + + /* If there is no space for the current message (plus trailing + * nullbyte) in the ringbuffer, we need to wrap and write to the + * beginning again. */ + if ((len+1) >= (logbuffer_size - (logwalk - logbuffer))) { + loglastwrap = logwalk; + logwalk = logbuffer + sizeof(i3_shmlog_header); + } + + /* Copy the buffer, terminate it, move the write pointer to the byte after + * our current message. */ + strncpy(logwalk, message, len); + logwalk[len] = '\0'; + logwalk += len + 1; + + store_log_markers(); + + if (print) + fwrite(message, len, 1, stdout); + } } /* @@ -108,11 +237,11 @@ void vlog(char *fmt, va_list args) { void verboselog(char *fmt, ...) { va_list args; - if (!verbose) + if (!logbuffer && !verbose) return; va_start(args, fmt); - vlog(fmt, args); + vlog(verbose, fmt, args); va_end(args); } @@ -124,7 +253,7 @@ void errorlog(char *fmt, ...) { va_list args; va_start(args, fmt); - vlog(fmt, args); + vlog(true, fmt, args); va_end(args); /* also log to the error logfile, if opened */ @@ -143,10 +272,10 @@ void errorlog(char *fmt, ...) { void debuglog(uint64_t lev, char *fmt, ...) { va_list args; - if ((loglevel & lev) == 0) + if (!logbuffer && !(loglevel & lev)) return; va_start(args, fmt); - vlog(fmt, args); + vlog((loglevel & lev), fmt, args); va_end(args); }