#include <fcntl.h>
#include "logger.h"
+static int logfd = -1, orig_fd1 = -1;
+
int init_logger(const char *fname)
{
- int fd;
- if((fd = open(fname, O_CREAT | O_WRONLY | O_TRUNC, 0644)) == -1) {
+ if(logfd != -1) return -1;
+
+ if((logfd = open(fname, O_CREAT | O_WRONLY | O_TRUNC, 0644)) == -1) {
fprintf(stderr, "init_logger: failed to open %s: %s\n", fname, strerror(errno));
return -1;
}
+ orig_fd1 = dup(1);
close(1);
close(2);
- dup(fd);
- dup(fd);
+ dup(logfd);
+ dup(logfd);
+ return 0;
+}
+
+void stop_logger(void)
+{
+ if(logfd >= 0) {
+ close(logfd);
+ logfd = -1;
+ }
+ if(orig_fd1 >= 0) {
+ close(1);
+ close(2);
+ dup(orig_fd1);
+ dup(orig_fd1);
+ orig_fd1 = -1;
+ }
+}
+
+int print_tail(const char *fname)
+{
+ FILE *fp;
+ char buf[64];
+ long lineoffs[16];
+ int wr, rd, c;
+
+ if(!(fp = fopen(fname, "r"))) {
+ return -1;
+ }
+ wr = rd = 0;
+ lineoffs[wr++] = 0;
+ while(fgets(buf, sizeof buf, fp)) {
+ lineoffs[wr] = ftell(fp);
+ wr = (wr + 1) & 0xf;
+ if(wr == rd) {
+ rd = (rd + 1) & 0xf;
+ }
+ }
+
+ fseek(fp, lineoffs[rd], SEEK_SET);
+ while((c = fgetc(fp)) != -1) {
+ fputc(c, stdout);
+ }
+ fclose(fp);
return 0;
}