libc-bottom-half/sources/__wasilibc_tell.c

   1 #include <wasi/api.h>
   2 #include <errno.h>
   3
   4 off_t __wasilibc_tell(int fildes) {
   5     __wasi_filesize_t offset;
   6     __wasi_errno_t error = __wasi_fd_tell(fildes, &offset);
   7     if (error != 0) {
   8         // lseek returns ESPIPE on when called on a pipe, socket, or fifo,
   9         // which on WASI would translate into ENOTCAPABLE.
  10         errno = error == ENOTCAPABLE ? ESPIPE : error;
  11         return -1;
  12     }
  13     return offset;
  14 }