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#******************************************************************************
# SYNOPSIS:
# X_AC_CHECK_FIFO_RECVFD
#
# DESCRIPTION:
# Check to see if a fifo (constructed via mkfifo) can be used to pass
# file descriptors using a struct strrecvfd and the I_RECVFD ioctl.
#******************************************************************************
AC_DEFUN([X_AC_CHECK_FIFO_RECVFD], [
AC_CACHE_CHECK(
[if file descriptors can be passed over a fifo],
[x_ac_cv_check_fifo_recvfd], [
AS_VAR_SET(x_ac_cv_check_fifo_recvfd, no)
AC_RUN_IFELSE([
AC_LANG_PROGRAM([[
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <stropts.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#ifndef PATH_MAX
#define PATH_MAX 4096
#endif /* !PATH_MAX */
]],
[[
char name[PATH_MAX];
char *tmpdir;
char *basename = "fifo";
int fd;
struct strrecvfd recvfd;
int rc = 1;
if (!(tmpdir = getenv ("TMPDIR")))
tmpdir = "/tmp";
snprintf (name, sizeof (name), "%s/.%s.%d", tmpdir, basename, getpid ());
unlink (name);
if ( ( mkfifo (name, S_IWUSR | S_IRUSR) == 0)
&& ((fd = open (name, O_RDONLY | O_NONBLOCK)) >= 0)
&& ((ioctl (fd, I_RECVFD, &recvfd) == -1) && (errno == EAGAIN)) ) {
rc = 0;
}
unlink (name);
return (rc); ]]
)],
AS_VAR_SET(x_ac_cv_check_fifo_recvfd, yes),
AS_VAR_SET(x_ac_cv_check_fifo_recvfd, no)
)]
)
AS_IF([test AS_VAR_GET(x_ac_cv_check_fifo_recvfd) = yes],
AC_DEFINE([HAVE_FIFO_RECVFD], [1],
[Define to 1 if file descriptors can be passed over a fifo.]
)
)]
)
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