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dnl * see if fd passing works
AC_DEFUN([DOVECOT_FD_PASSING], [
AC_CACHE_CHECK([whether fd passing works],i_cv_fd_passing,[
for i in 1 2; do
old_cflags="$CFLAGS"
CFLAGS="$CFLAGS -I$srcdir/src/lib $srcdir/src/lib/fdpass.c"
if test $i = 2; then
CFLAGS="$CFLAGS -DBUGGY_CMSG_MACROS"
fi
AC_TRY_RUN([
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include "fdpass.h"
static
int nopen(void)
{
int i, n;
struct stat sb;
for (i = n = 0; i < 256; i++)
if (fstat(i, &sb) == 0) n++;
return n;
}
int main(void)
{
int fd[2], send_fd, recv_fd, status, n1, n2;
struct stat st, st2;
char data;
send_fd = creat("conftest.fdpass", 0600);
if (send_fd == -1) return 2;
unlink("conftest.fdpass");
if (fstat(send_fd, &st) < 0) return 2;
if (socketpair(AF_UNIX, SOCK_STREAM, 0, fd) < 0) return 2;
n1 = nopen();
switch (fork()) {
case -1:
return 2;
case 0:
alarm(1);
if (fd_send(fd[0], send_fd, &data, 1) != 1) return 2;
return 0;
default:
alarm(2);
if (wait(&status) == -1)
return 2;
if (status != 0)
return status;
if (fd_read(fd[1], &data, 1, &recv_fd) != 1) return 1;
if (fstat(recv_fd, &st2) < 0) return 2;
/* nopen check is for making sure that only a single fd
was received */
n2 = nopen();
return st.st_ino == st2.st_ino && n2 == n1 + 1 ? 0 : 1;
}
}
], [
CFLAGS=$old_cflags
if test $i = 2; then
i_cv_fd_passing=buggy_cmsg_macros
else
i_cv_fd_passing=yes
fi
break
], [
dnl no, try with BUGGY_CMSG_MACROS
CFLAGS=$old_cflags
i_cv_fd_passing=no
])
done
]);
case "$host_os" in
darwin[[1-9]].*)
if test "$i_cv_fd_passing" = "yes"; then
i_cv_fd_passing=buggy_cmsg_macros
fi
;;
esac
if test $i_cv_fd_passing = buggy_cmsg_macros; then
AC_DEFINE(BUGGY_CMSG_MACROS,, [Define if you have buggy CMSG macros])
fi
if test $i_cv_fd_passing = no; then
AC_ERROR([fd passing is required for Dovecot to work])
fi
])
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