libc-bottom-half/cloudlibc/src/libc/sys/socket/send.c

   1 // Copyright (c) 2015-2017 Nuxi, https://nuxi.nl/
   2 //
   3 // SPDX-License-Identifier: BSD-2-Clause
   4
   5 #include <common/errno.h>
   6
   7 #include <sys/socket.h>
   8
   9 #include <assert.h>
  10 #include <wasi/core.h>
  11 #include <errno.h>
  12
  13 ssize_t send(int socket, const void *buffer, size_t length, int flags) {
  14   // This implementation does not support any flags.
  15   if (flags != 0) {
  16     errno = EOPNOTSUPP;
  17     return -1;
  18   }
  19
  20   // Prepare input parameters.
  21   __wasi_ciovec_t iov = {.buf = buffer, .buf_len = length};
  22 #ifdef __wasilibc_unmodified_upstream // send/recv
  23   __wasi_send_in_t si = {
  24       .si_data = &iov,
  25       .si_data_len = 1,
  26   };
  27 #else
  28   __wasi_ciovec_t *si_data = &iov;
  29   size_t si_data_len = 1;
  30   __wasi_siflags_t si_flags = 0;
  31 #endif
  32
  33   // Perform system call.
  34 #ifdef __wasilibc_unmodified_upstream // send/recv
  35   __wasi_send_out_t so;
  36   __wasi_errno_t error = __wasi_sock_send(socket, &si, &so);
  37 #else
  38   size_t so_datalen;
  39   __wasi_errno_t error = __wasi_sock_send(socket, si_data, si_data_len, si_flags, &so_datalen);
  40 #endif
  41   if (error != 0) {
  42     errno = errno_fixup_socket(socket, error);
  43     return -1;
  44   }
  45 #ifdef __wasilibc_unmodified_upstream // send/recv
  46   return so.so_datalen;
  47 #else
  48   return so_datalen;
  49 #endif
  50 }