Add wob_log_* functions

Author: francma

.clang-format

@@ -17,3 +17,4 @@ UseTab: ForContinuationAndIndentation
 AlwaysBreakBeforeMultilineStrings: 'true'
 BinPackArguments: 'false'
 ForEachMacros: ['wl_list_for_each_safe', 'wl_list_for_each']
+AlignAfterOpenBracket: AlwaysBreak

buffer.c

@@ -1,13 +1,17 @@
+#define WOB_FILE "buffer.c"
+
 #define _POSIX_C_SOURCE 200112L
 
 #include <errno.h>
 #include <fcntl.h>
 #include <limits.h>
 #include <stdio.h>
+#include <string.h>
 #include <sys/mman.h>
 #include <unistd.h>
 
 #include "buffer.h"
+#include "log.h"
 
 int
 wob_shm_create()
@@ -25,12 +29,12 @@ wob_shm_create()
 	}
 
 	if (shmid < 0) {
-		perror("shm_open");
+		wob_log_error("shm_open() failed: %s", strerror(errno));
 		return -1;
 	}
 
 	if (shm_unlink(shm_name) != 0) {
-		perror("shm_unlink");
+		wob_log_error("shm_unlink() failed: %s", strerror(errno));
 		return -1;
 	}
 
@@ -41,13 +45,13 @@ void *
 wob_shm_alloc(const int shmid, const size_t size)
 {
 	if (ftruncate(shmid, size) != 0) {
-		perror("ftruncate");
+		wob_log_error("ftruncate() failed: %s", strerror(errno));
 		return NULL;
 	}
 
 	void *buffer = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, shmid, 0);
 	if (buffer == MAP_FAILED) {
-		perror("mmap");
+		wob_log_error("mmap() failed: %s", strerror(errno));
 		return NULL;
 	}
 

include/log.h

@@ -0,0 +1,31 @@
+#ifndef _WOB_LOG_H
+#define _WOB_LOG_H
+
+#include <stdbool.h>
+
+typedef enum {
+	_WOB_LOG_DEBUG = 0,
+	_WOB_LOG_INFO = 1,
+	_WOB_LOG_WARN = 2,
+	_WOB_LOG_ERROR = 3,
+} _wob_log_importance;
+
+void _wob_log(const _wob_log_importance importance, const char *file, const int line, const char *fmt, ...);
+
+void _wob_log_set_level(const _wob_log_importance importance);
+
+void wob_log_inc_verbosity(void);
+
+void wob_log_use_colors(bool use_colors);
+
+#define wob_log_debug(...) _wob_log(_WOB_LOG_DEBUG, WOB_FILE, __LINE__, __VA_ARGS__)
+#define wob_log_info(...) _wob_log(_WOB_LOG_INFO, WOB_FILE, __LINE__, __VA_ARGS__)
+#define wob_log_warn(...) _wob_log(_WOB_LOG_WARN, WOB_FILE, __LINE__, __VA_ARGS__)
+#define wob_log_error(...) _wob_log(_WOB_LOG_ERROR, WOB_FILE, __LINE__, __VA_ARGS__)
+
+#define wob_log_level_debug() _wob_log_set_level(_WOB_LOG_DEBUG);
+#define wob_log_level_info() _wob_log_set_level(_WOB_LOG_INFO);
+#define wob_log_level_warn() _wob_log_set_level(_WOB_LOG_WARN);
+#define wob_log_level_error() _wob_log_set_level(_WOB_LOG_ERROR);
+
+#endif

log.c

@@ -0,0 +1,113 @@
+#define WOB_FILE "log.c"
+
+#define _POSIX_C_SOURCE 199506L
+
+#define COLOR_RESET "\x1B[0m"
+#define COLOR_WHITE "\x1B[1;37m"
+#define COLOR_BLACK "\x1B[0;30m"
+#define COLOR_BLUE "\x1B[0;34m"
+#define COLOR_LIGHT_BLUE "\x1B[1;34m"
+#define COLOR_GREEN "\x1B[0;32m"
+#define COLOR_LIGHT_GREEN "\x1B[1;32m"
+#define COLOR_CYAN "\x1B[0;36m"
+#define COLOR_LIGHT_CYAN "\x1B[1;36m"
+#define COLOR_RED "\x1B[0;31m"
+#define COLOR_LIGHT_RED "\x1B[1;31m"
+#define COLOR_PURPLE "\x1B[0;35m"
+#define COLOR_LIGHT_PURPLE "\x1B[1;35m"
+#define COLOR_BROWN "\x1B[0;33m"
+#define COLOR_YELLOW "\x1B[1;33m"
+#define COLOR_GRAY "\x1B[0;30m"
+#define COLOR_LIGHT_GRAY "\x1B[0;37m"
+
+#include <errno.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "log.h"
+
+static _wob_log_importance min_importance_to_log = _WOB_LOG_WARN;
+
+static bool use_colors = false;
+
+static const char *verbosity_names[] = {
+	"DEBUG",
+	"INFO",
+	"WARN",
+	"ERROR",
+};
+
+static const char *verbosity_colors[] = {
+	COLOR_LIGHT_CYAN,
+	COLOR_GREEN,
+	COLOR_YELLOW,
+	COLOR_LIGHT_RED,
+};
+
+void
+_wob_log(const _wob_log_importance importance, const char *file, const int line, const char *fmt, ...)
+{
+	if (importance < min_importance_to_log) {
+		return;
+	}
+
+	struct timespec ts;
+	if (clock_gettime(CLOCK_REALTIME, &ts) != 0) {
+		fprintf(stderr, "clock_gettime() failed: %s\n", strerror(errno));
+		ts.tv_sec = 0;
+		ts.tv_nsec = 0;
+	}
+
+	// formatting time via localtime() requires open syscall (to read /etc/localtime)
+	// and that is problematic with seccomp rules in place
+	if (use_colors) {
+		fprintf(
+			stderr,
+			"%jd.%06ld %s%-5s%s %s%s:%d:%s ",
+			(intmax_t) ts.tv_sec,
+			ts.tv_nsec / 1000,
+			verbosity_colors[importance],
+			verbosity_names[importance],
+			COLOR_RESET,
+			COLOR_GRAY,
+			file,
+			line,
+			COLOR_RESET);
+	}
+	else {
+		fprintf(stderr, "%jd.%06ld %s %s:%d: ", (intmax_t) ts.tv_sec, ts.tv_nsec / 1000, verbosity_names[importance], file, line);
+	}
+
+	va_list args;
+	va_start(args, fmt);
+	vfprintf(stderr, fmt, args);
+	va_end(args);
+	fprintf(stderr, "\n");
+}
+
+void
+_wob_log_set_level(const _wob_log_importance importance)
+{
+	min_importance_to_log = importance;
+}
+
+void
+wob_log_use_colors(const bool colors)
+{
+	use_colors = colors;
+}
+
+void
+wob_log_inc_verbosity(void)
+{
+	if (min_importance_to_log != _WOB_LOG_DEBUG) {
+		min_importance_to_log -= 1;
+		wob_log_debug("Set log level to %s", verbosity_names[min_importance_to_log]);
+	}
+}