text: #include <stdlib.h>
  #include <limits.h>
  #include <sys/stat.h>
  #include <fcntl.h>
  #include <errno.h>
  #include <unistd.h>
  #include <string.h>
  #include "syscall.h"
  
  #include "../gg/gg.h"
  
  void __procfdname(char *, unsigned);
  
  char *realpath(const char *restrict filename, char *restrict resolved)
  {
  	int fd;
  	ssize_t r;
  	struct stat st1, st2;
  	char buf[15+3*sizeof(int)];
  	char tmp[PATH_MAX];
  
  	if (!filename) {
  		errno = EINVAL;
  		return 0;
  	}
  
    if(__gg.enabled){
      return resolved ? strcpy( resolved, filename ) : strdup( filename );
    }
  
  	fd = sys_open(filename, O_PATH|O_NONBLOCK|O_CLOEXEC);
  	if (fd < 0) return 0;
  	__procfdname(buf, fd);
  
  	r = readlink(buf, tmp, sizeof tmp - 1);
  	if (r < 0) goto err;
  	tmp[r] = 0;
  
  	fstat(fd, &st1);
  	r = stat(tmp, &st2);
  	if (r<0 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino) {
  		if (!r) errno = ELOOP;
  		goto err;
  	}
  
  	__syscall(SYS_close, fd);
  	return resolved ? strcpy(resolved, tmp) : strdup(tmp);
  err:
  	__syscall(SYS_close, fd);
  	return 0;
  }
  