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configure.ac: Detect broken poll()

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This commit is contained in:
Edward Hervey 2009-10-12 09:47:59 +02:00
parent 7fcd73875f
commit b90360473b
1 changed files with 30 additions and 0 deletions
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30
configure.ac
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@ -395,6 +395,36 @@ AC_CHECK_FUNCS([poll])
AC_CHECK_FUNCS([ppoll])
AC_CHECK_FUNCS([pselect])
dnl ****************************************
dnl *** GLib POLL* compatibility defines ***
dnl ****************************************
AC_MSG_CHECKING([for broken poll])
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <stdlib.h>
#include <fcntl.h>
#include <poll.h>
#ifdef HAVE_SYS_POLL_H
#include <sys/poll.h>
#endif
int main(void) {
struct pollfd fds[1];
int fd;
fd = open("/dev/null", 1);
fds[0].fd = fd;
fds[0].events = POLLIN;
fds[0].revents = 0;
if (poll(fds, 1, 0) < 0 || (fds[0].revents & POLLNVAL) != 0) {
exit(1); /* Does not work for devices -- fail */
}
exit(0);
}]])],
[broken_poll=no],
[broken_poll=yes
AC_DEFINE(BROKEN_POLL,1,[poll doesn't work on devices])],
[broken_poll="no (cross compiling)"])
AC_MSG_RESULT($broken_poll)
dnl check for mmap()
AC_FUNC_MMAP
AM_CONDITIONAL(HAVE_MMAP, test "x$ac_cv_func_mmap_fixed_mapped" = "xyes")