Add ipc_timed_send

2 files changed, 34 insertions, 0 deletions

diff --git a/src/include/skalibs/unix-timed.h b/src/include/skalibs/unix-timed.h
index 5fad179..c3ae4cd 100644
--- a/src/include/skalibs/unix-timed.h
+++ b/src/include/skalibs/unix-timed.h
@@ -33,4 +33,7 @@ extern int timed_getlnmax (buffer *, char *, unsigned int, unsigned int *, char,
 extern int netstring_timed_get (buffer *, stralloc *, tain_t const *, tain_t *) ;
 #define netstring_timed_get_g(b, sa, deadline) netstring_timed_get(b, sa, (deadline), &STAMP)
 
+extern int ipc_timed_send (int, char const *, unsigned int, tain_t const *, tain_t *) ;
+#define ipc_timed_send_g(fd, s, len, deadline) ipc_timed_send(fd, s, len, (deadline), &STAMP)
+
 #endif
diff --git a/src/libunixonacid/ipc_timed_send.c b/src/libunixonacid/ipc_timed_send.c
new file mode 100644
index 0000000..9ba1e32
--- /dev/null
+++ b/src/libunixonacid/ipc_timed_send.c
@@ -0,0 +1,31 @@
+/* ISC license. */
+
+#include <sys/socket.h>
+#include <errno.h>
+#include <skalibs/error.h>
+#include <skalibs/tai.h>
+#include <skalibs/iopause.h>
+#include <skalibs/unix-timed.h>
+
+ /* Yay MacOS */
+#ifndef MSG_NOSIGNAL
+#define MSG_NOSIGNAL 0
+#endif
+
+int ipc_timed_send (int fd, char const *s, unsigned int len, tain_t const *deadline, tain_t *stamp)
+{
+  iopause_fd x = { .fd = fd, .events = IOPAUSE_WRITE, .revents = 0 } ;
+  for (;;)
+  {
+    register int r = iopause_stamp(&x, 1, deadline, stamp) ;
+    if (r < 0) return 0 ;
+    else if (!r) return (errno = ETIMEDOUT, 0) ;
+    else if (x.revents & IOPAUSE_WRITE)
+    {
+      if (send(fd, s, len, MSG_NOSIGNAL) == (int)len) break ;
+      if (!error_isagain(errno)) return 0 ;
+    }
+    else if (x.revents & IOPAUSE_EXCEPT) return (send(fd, s, len, MSG_NOSIGNAL) == (int)len) ;
+  }
+  return 1 ;
+}