126 lines
2.9 KiB
C
126 lines
2.9 KiB
C
/* SPDX-License-Identifier: MIT
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*
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* Copyright © 2018 WireGuard LLC. All Rights Reserved.
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*/
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#include <string.h>
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#include <stdio.h>
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#include <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/mman.h>
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#include "ringlogger.h"
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enum {
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MAX_LOG_LINE_LENGTH = 512,
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MAX_LINES = 1024,
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MAGIC = 0xdeadbeefU
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};
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struct log_line {
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struct timeval tv;
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char line[MAX_LOG_LINE_LENGTH];
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};
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struct log {
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struct { uint32_t first, len; } header;
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struct log_line lines[MAX_LINES];
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uint32_t magic;
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};
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void write_msg_to_log(struct log *log, const char *msg)
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{
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struct log_line *line = &log->lines[(log->header.first + log->header.len) % MAX_LINES];
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if (log->header.len == MAX_LINES)
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log->header.first = (log->header.first + 1) % MAX_LINES;
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else
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++log->header.len;
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gettimeofday(&line->tv, NULL);
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strncpy(line->line, msg, MAX_LOG_LINE_LENGTH - 1);
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line->line[MAX_LOG_LINE_LENGTH - 1] = '\0';
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msync(&log->header, sizeof(log->header), MS_ASYNC);
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msync(line, sizeof(*line), MS_ASYNC);
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}
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static bool first_before_second(const struct log_line *line1, const struct log_line *line2)
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{
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if (line1->tv.tv_sec <= line2->tv.tv_sec)
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return true;
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else if (line1->tv.tv_sec == line2->tv.tv_sec)
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return line1->tv.tv_usec <= line2->tv.tv_usec;
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return false;
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}
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int write_logs_to_file(const char *file_name, const struct log *log1, const struct log *log2)
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{
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uint32_t i1, i2, len1 = log1->header.len, len2 = log2->header.len;
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char buf[MAX_LOG_LINE_LENGTH];
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FILE *file;
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if (len1 > MAX_LINES)
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len1 = MAX_LINES;
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if (len2 > MAX_LINES)
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len2 = MAX_LINES;
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file = fopen(file_name, "w");
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if (!file)
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return -errno;
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for (i1 = 0, i2 = 0;;) {
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const struct log_line *line1 = &log1->lines[(log1->header.first + i1) % MAX_LINES];
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const struct log_line *line2 = &log2->lines[(log2->header.first + i2) % MAX_LINES];
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const struct log_line *line;
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if (i1 < len1 && (i2 >= len2 || first_before_second(line1, line2))) {
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line = line1;
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++i1;
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} else if (i2 < len2 && (i1 >= len1 || first_before_second(line2, line1))) {
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line = line2;
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++i2;
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} else {
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break;
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}
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memcpy(buf, line->line, MAX_LOG_LINE_LENGTH);
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buf[MAX_LOG_LINE_LENGTH - 1] = '\0';
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if (fprintf(file, "%lu.%06d: %s\n", line->tv.tv_sec, line->tv.tv_usec, buf) < 0) {
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int ret = -errno;
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fclose(file);
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return ret;
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}
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}
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fclose(file);
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return 0;
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}
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struct log *open_log(const char *file_name)
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{
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int fd;
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struct log *log;
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fd = open(file_name, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
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if (fd < 0)
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return NULL;
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if (ftruncate(fd, sizeof(*log)))
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return NULL;
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log = mmap(NULL, sizeof(*log), PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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if (log == MAP_FAILED)
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return NULL;
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close(fd);
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if (log->magic != MAGIC) {
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memset(log, 0, sizeof(*log));
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log->magic = MAGIC;
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msync(log, sizeof(*log), MS_ASYNC);
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}
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return log;
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}
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