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Problem: tweetnacl leaks file descriptor on fork+exec

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Solution: open with O_CLOEXEC if available or set FD_CLOEXEC if not
This commit is contained in:
Luca Boccassi
2017-07-27 23:29:33 +01:00
parent e015a0f8b9
commit 2626fdfa23
5 changed files with 58 additions and 1 deletions
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25
acinclude.m4
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@@ -614,6 +614,31 @@ int main (int argc, char *argv [])
AS_IF([test "x$libzmq_cv_sock_cloexec" = "xyes"], [$1], [$2])
}])
dnl ################################################################################
dnl # LIBZMQ_CHECK_O_CLOEXEC([action-if-found], [action-if-not-found]) #
dnl # Check if O_CLOEXEC is supported #
dnl ################################################################################
AC_DEFUN([LIBZMQ_CHECK_O_CLOEXEC], [{
AC_CACHE_CHECK([whether O_CLOEXEC is supported], [libzmq_cv_o_cloexec],
[AC_TRY_RUN([/* O_CLOEXEC test */
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
int main (int argc, char *argv [])
{
int s = open ("/dev/null", O_CLOEXEC | O_RDONLY);
return (s == -1);
}
],
[libzmq_cv_o_cloexec="yes"],
[libzmq_cv_o_cloexec="no"],
[libzmq_cv_o_cloexec="not during cross-compile"]
)]
)
AS_IF([test "x$libzmq_cv_o_cloexec" = "xyes"], [$1], [$2])
}])
dnl ################################################################################
dnl # LIBZMQ_CHECK_EVENTFD_CLOEXEC([action-if-found], [action-if-not-found]) #
dnl # Check if EFD_CLOEXEC is supported #