commit - b879254714ca5a54cb1fcabe7ee60802f4c7e9e2
commit + 4e457e622a3cc784da56111553ff67082014d33b
blob - fa4099bf92dcb65c227a7b617dbe12ae355cf7ce
blob + 26f15a0acdb7fca63a4345efbd1163deb204f9ba
--- compats.c
+++ compats.c
@@ -268,6 +268,16 @@ explicit_bzero(void *p, size_t n)
 
 #endif /* HAVE_MEMSET_S */
 #endif /* !HAVE_EXPLICIT_BZERO */
+#if !HAVE_GETDTABLESIZE
+/* public domain */
+#include <unistd.h>
+
+int
+getdtablesize(void)
+{
+	return sysconf(_SC_OPEN_MAX);
+}
+#endif /* !HAVE_GETDTABLESIZE */
 #if !HAVE_GETPROGNAME
 /*
  * Copyright (c) 2016 Nicholas Marriott <nicholas.marriott@gmail.com>
blob - 42ff903a52b524754def669f90dfb577a765914e
blob + fc890e034e60584ffbbdb798b8235be8ad3af3dc
--- configure
+++ configure
@@ -215,6 +215,7 @@ HAVE_EXPLICIT_BZERO=
 HAVE_FLOCK=
 HAVE_FREEZERO=
 HAVE_GETDTABLECOUNT=
+HAVE_GETDTABLESIZE=
 HAVE_GETEXECNAME=
 HAVE_GETPROGNAME=
 HAVE_INFTIM=
@@ -545,6 +546,7 @@ runtest explicit_bzero	EXPLICIT_BZERO			  || true
 runtest flock		FLOCK				  || true
 runtest freezero	FREEZERO			  || true
 runtest getdtablecount	GETDTABLECOUNT			  || true
+runtest getdtablesize	GETDTABLESIZE			  || true
 runtest getexecname	GETEXECNAME			  || true
 runtest getprogname	GETPROGNAME			  || true
 runtest INFTIM		INFTIM				  || true
@@ -772,6 +774,7 @@ cat << __HEREDOC__
 #define HAVE_FLOCK ${HAVE_FLOCK}
 #define HAVE_FREEZERO ${HAVE_FREEZERO}
 #define HAVE_GETDTABLECOUNT ${HAVE_GETDTABLECOUNT}
+#define HAVE_GETDTABLESIZE ${HAVE_GETDTABLESIZE}
 #define HAVE_GETEXECNAME ${HAVE_GETEXECNAME}
 #define HAVE_GETPROGNAME ${HAVE_GETPROGNAME}
 #define HAVE_LIB_IMSG ${HAVE_LIB_IMSG}
@@ -976,6 +979,10 @@ cat << __HEREDOC__
 #define getdtablecount() (0)
 #endif
 
+#if !HAVE_GETDTABLESIZE
+int	 getdtablesize(void);
+#endif
+
 #if !HAVE_OPTRESET
 /* replace host' getopt with OpenBSD' one */
 #define opterr		BSDopterr
blob - 59b7b979f157153849d4d0dcd1db44b73979514d
blob + e4bbd7417e0dbdd9846f1afe0dfffed92d2a7fca
--- tests.c
+++ tests.c
@@ -210,6 +210,15 @@ main(void)
 	return getdtablecount();
 }
 #endif /* TEST_GETDTABLECOUNT */
+#if TEST_GETDTABLESIZE
+#include <unistd.h>
+
+int
+main(void)
+{
+	return getdtablesize();
+}
+#endif /* TEST_GETDTABLESIZE */
 #if TEST_GETEXECNAME
 #include <stdlib.h>