gnulib: use GCOMPAT__assert_with_reason() instead of bare assert()

1 files changed, 10 insertions, 2 deletions

diff --git a/libgcompat/gnulib.c b/libgcompat/gnulib.c
index e0ee953..ccdec24 100644
--- a/libgcompat/gnulib.c
+++ b/libgcompat/gnulib.c
@@ -1,8 +1,16 @@
-#include <assert.h>
 #include <sys/select.h>
+#include "internal.h"
+
+#define REASON_FD_SET_OVERFLOW										\
+	"Fault: Overflow in fd_set detected.\n"								\
+	"Description: This is caused by a programmer naively attempting to redefine FD_SETSIZE,\n"	\
+	"  which is not allowed on POSIX platforms.  The program must be either rebuilt\n"		\
+	"  with the correct FD_SETSIZE definition, or preferably rewritten to avoid use\n"		\
+	"  of select(2) in general.  See also: poll(2).\n"						\
+	"  libgcompat believes FD_SETSIZE to be %zu.\n"
 
 unsigned long __fdelt_chk(unsigned long size)
 {
-	assert(size < FD_SETSIZE);
+	GCOMPAT__assert_with_reason(size < FD_SETSIZE, REASON_FD_SET_OVERFLOW, FD_SETSIZE);
 	return size / (sizeof(unsigned long) << 3);
 }