Function lock_range

util1.c:632–643

Lock a byte range in a open file */

/** Lock a byte range in a open file */
int lock_range(int fd, int offset, int len)
{
	struct flock lock;

	lock.l_type = F_WRLCK;
	lock.l_whence = SEEK_SET;
	lock.l_start = offset;
	lock.l_len = len;
	lock.l_pid = 0;

	return fcntl(fd,F_SETLK,&lock) == 0;
}

#define ENSURE_MEMSPACE(buf, type, sz, req) \
	do { if ((req) > sz) buf = realloc_array(buf, type, sz = MAX(sz * 2, req)); } while(0)