From 23bdcb4ad4ef19d99b729e5282fd15df6300a3b5 Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Sun, 21 Dec 2014 00:26:40 +0000
Subject:  So the non-portable MSG_DONTWAIT may alleviate the problem... might
 as well use it on architectures that support it.

---
 src/sysdeps/tryokwaitall.c | 117 ---------------------------------------------
 1 file changed, 117 deletions(-)
 delete mode 100644 src/sysdeps/tryokwaitall.c

(limited to 'src/sysdeps/tryokwaitall.c')

diff --git a/src/sysdeps/tryokwaitall.c b/src/sysdeps/tryokwaitall.c
deleted file mode 100644
index 15721b5..0000000
--- a/src/sysdeps/tryokwaitall.c
+++ /dev/null
@@ -1,117 +0,0 @@
-/* ISC license. */
-
-#undef _POSIX_C_SOURCE
-#undef _XOPEN_SOURCE
-
-#ifndef _XPG4_2
-# define _XPG4_2
-#endif
-
-#ifndef _BSD_SOURCE
-#define _BSD_SOURCE
-#endif
-
-#include <sys/types.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <errno.h>
-#include <signal.h>
-#include <sys/socket.h>
-#include <sys/select.h>
-#include <sys/uio.h>
-#if defined(__FreeBSD__)
-#include <sys/param.h>
-#endif
-
-#ifndef MSG_NOSIGNAL
-#define MSG_NOSIGNAL 0
-#endif
-
-static int ndelay_on (int fd)
-{
-  register int got = fcntl(fd, F_GETFL) ;
-  return (got == -1) ? -1 : fcntl(fd, F_SETFL, got | O_NONBLOCK) ;
-}
-
-static int child (int p, int fd)
-{
-  char c ;
-  struct iovec v = { .iov_base = &c, .iov_len = 1 } ;
-  struct msghdr msg =
-  {
-    .msg_name = 0,
-    .msg_namelen = 0,
-    .msg_iov = &v,
-    .msg_iovlen = 1,
-    .msg_control = 0,
-    .msg_controllen = 0
-  } ;
-  fd_set rfds ;
-  if (ndelay_on(fd) < 0) return 111 ;
-  FD_ZERO(&rfds) ;
-  FD_SET(fd, &rfds) ;
-  if (write(p, "", 1) < 1) return 111 ; /* sync with the parent */
-  if (select(fd+1, &rfds, 0, 0, 0) < 1) return 111 ;
-
-  /* On buggy systems, the following recvmsg will block, despite
-     setting the fd non-blocking */
-
-  if (recvmsg(fd, &msg, MSG_WAITALL) < 1) return 111 ;
-  if (write(p, "", 1) < 1) return 111 ;
-  return 0 ;
-}
-
-static int parent (pid_t pid, int p, int fd)
-{
-  char c ;
-  struct iovec v = { .iov_base = &c, .iov_len = 1 } ;
-  struct msghdr msg =
-  {
-    .msg_name = 0,
-    .msg_namelen = 0,
-    .msg_iov = &v,
-    .msg_iovlen = 1,
-    .msg_control = 0,
-    .msg_controllen = 0
-  } ;
-  struct timeval tv = { .tv_sec = 2, .tv_usec = 0 } ;
-  fd_set rfds ;
-  unsigned int n = p > fd ? p : fd ;
-  int r ;
-  FD_ZERO(&rfds) ;
-  FD_SET(p, &rfds) ;
-  if (read(p, &c, 1) < 1) return 111 ;
-  if (sendmsg(fd, &msg, MSG_NOSIGNAL) < 1) return 111 ;
-  for (;;)
-  {
-    r = select(n+1, &rfds, 0, 0, &tv) ;
-    if (r >= 0 || errno != EINTR) break ;
-  }
-  if (!r) /* child is still blocking on recvmsg() after 2 seconds */
-  {
-    kill(pid, SIGTERM) ;
-    return 1 ;
-  }
-  if (read(p, &c, 1) < 1) return 111 ;
-  return 0 ;
-}
-
-int main (void)
-{
-  pid_t pid ;
-  int fd[2] ;
-  int p[2] ;
-  if (pipe(p) < 0) return 111 ;
-  if (socketpair(AF_UNIX, SOCK_STREAM, 0, fd) < 0) return 111 ;
-  pid = fork() ;
-  if (pid < 0) return 111 ;
-  if (!pid)
-  {
-    close(p[0]) ;
-    close(fd[0]) ;
-    return child(p[1], fd[1]) ;
-  }
-  close(p[1]) ;
-  close(fd[1]) ;
-  return parent(pid, p[0], fd[0]) ;
-}
-- 
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