Initial commit

1 files changed, 47 insertions, 0 deletions

diff --git a/src/libwpactrl/wpactrl_fd_recv.c b/src/libwpactrl/wpactrl_fd_recv.c
new file mode 100644
index 0000000..3e2a006
--- /dev/null
+++ b/src/libwpactrl/wpactrl_fd_recv.c
@@ -0,0 +1,47 @@
+/* ISC license. */
+
+#include <skalibs/sysdeps.h>
+#include <skalibs/nonposix.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+#include <errno.h>
+#include <bcnm/wpactrl.h>
+#include "wpactrl-internal.h"
+
+ssize_t wpactrl_fd_recv (int fd, char *s, size_t len)
+{
+  static int const bsd_braindeadness_workaround_flags =
+#ifdef SKALIBS_HASMSGDONTWAIT
+    MSG_DONTWAIT
+#else
+    0
+#endif
+    |
+#ifdef SKALIBS_HASNBWAITALL
+    MSG_WAITALL
+#else
+    0
+#endif
+    |
+#ifdef SKALIBS_HASCMSGCLOEXEC
+    MSG_CMSG_CLOEXEC
+#else
+    0
+#endif
+    ;
+  struct iovec iov = { .iov_base = s, .iov_len = len } ;
+  struct msghdr msghdr =
+  {
+    .msg_name = 0,
+    .msg_namelen = 0,
+    .msg_iov = &iov,
+    .msg_iovlen = 1,
+    .msg_flags = 0,
+    .msg_control = 0,
+    .msg_controllen = 0
+  } ;
+  ssize_t r ;
+  do r = recvmsg(fd, &msghdr, bsd_braindeadness_workaround_flags) ;
+  while (r == -1 && errno == EINTR) ;
+  return r > 0 && msghdr.msg_flags | MSG_TRUNC ? (errno = EMSGSIZE, -1) : r ;
+}