/* Create a pipe, with specific opening flags.
- Copyright (C) 2009 Free Software Foundation, Inc.
+ Copyright (C) 2009, 2010 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#include <errno.h>
#include <fcntl.h>
+#include "binary-io.h"
+
#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
/* Native Woe32 API. */
/* Try the system call first, if it exists. (We may be running with a glibc
that has the function but with an older kernel that lacks it.) */
{
- int result = pipe2 (fd, flags);
- if (!(result < 0 && errno == ENOSYS))
- return result;
+ /* Cache the information whether the system call really exists. */
+ static int have_pipe2_really; /* 0 = unknown, 1 = yes, -1 = no */
+ if (have_pipe2_really >= 0)
+ {
+ int result = pipe2 (fd, flags);
+ if (!(result < 0 && errno == ENOSYS))
+ {
+ have_pipe2_really = 1;
+ return result;
+ }
+ have_pipe2_really = -1;
+ }
}
#endif
int fcntl_flags;
if ((fcntl_flags = fcntl (fd[1], F_GETFL, 0)) < 0
- || fcntl (fd[1], F_SETFL, fcntl_flags | O_NONBLOCK) == -1
- || (fcntl_flags = fcntl (fd[0], F_GETFL, 0)) < 0
- || fcntl (fd[0], F_SETFL, fcntl_flags | O_NONBLOCK) == -1)
- goto fail;
+ || fcntl (fd[1], F_SETFL, fcntl_flags | O_NONBLOCK) == -1
+ || (fcntl_flags = fcntl (fd[0], F_GETFL, 0)) < 0
+ || fcntl (fd[0], F_SETFL, fcntl_flags | O_NONBLOCK) == -1)
+ goto fail;
}
if (flags & O_CLOEXEC)
int fcntl_flags;
if ((fcntl_flags = fcntl (fd[1], F_GETFD, 0)) < 0
- || fcntl (fd[1], F_SETFD, fcntl_flags | FD_CLOEXEC) == -1
- || (fcntl_flags = fcntl (fd[0], F_GETFD, 0)) < 0
- || fcntl (fd[0], F_SETFD, fcntl_flags | FD_CLOEXEC) == -1)
- goto fail;
+ || fcntl (fd[1], F_SETFD, fcntl_flags | FD_CLOEXEC) == -1
+ || (fcntl_flags = fcntl (fd[0], F_GETFD, 0)) < 0
+ || fcntl (fd[0], F_SETFD, fcntl_flags | FD_CLOEXEC) == -1)
+ goto fail;
}
# if O_BINARY