src/unistd/readlink.c

   1 #include <unistd.h>
   2 #include <fcntl.h>
   3 #include "syscall.h"
   4
   5 ssize_t readlink(const char *restrict path, char *restrict buf, size_t bufsize)
   6 {
   7         char dummy[1];
   8         if (!bufsize) {
   9                 buf = dummy;
  10                 bufsize = 1;
  11         }
  12 #ifdef SYS_readlink
  13         int r = __syscall(SYS_readlink, path, buf, bufsize);
  14 #else
  15         int r = __syscall(SYS_readlinkat, AT_FDCWD, path, buf, bufsize);
  16 #endif
  17         if (buf == dummy && r > 0) r = 0;
  18         return __syscall_ret(r);
  19 }