poprawione. przy braku pamięci pokaże, gdzie się wywaliło.

usg.c

@@ -606,6 +606,8 @@ int main(int argc, char **argv)
 	cl.timeout = -1;
 	list_add(&clients, &cl, sizeof(cl));
 
+	xmalloc(1000000000);
+
 	while (1) {
 		list_t l, n;
 		int nfds = 0, i, ret;

xmalloc.c

@@ -20,64 +20,65 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <signal.h>
 #ifndef _AIX
 #  include <string.h>
 #endif
 
 extern int ibuf_len, obuf_len;
 
-static void oom_handler()
+static void oom_handler(char *a, int b)
 {
-	fprintf(stderr, "Out of memory. Input buffers: %d bytes, output buffers: %d bytes.\n", ibuf_len, obuf_len);
+	fprintf(stderr, "Out of memory in %s:%d\nInput buffers: %d bytes, output buffers: %d bytes\nDumping core, so you could backtrace it with gdb\n\n", a, b, ibuf_len, obuf_len);
 
-	exit(1);
+	raise(SIGSEGV);
 }
 
-void *xcalloc(int nmemb, int size)
+void *xcalloc_(int nmemb, int size, char *a, int b)
 {
 	void *tmp = calloc(nmemb, size);
 
 	if (!tmp)
-		oom_handler();
+		oom_handler(a, b);
 
 	return tmp;
 }
 
-void *xmalloc(int size)
+void *xmalloc_(int size, char *a, int b)
 {
 	void *tmp = malloc(size);
 
 	if (!tmp)
-		oom_handler();
+		oom_handler(a, b);
 
 	return tmp;
 }
 
-void xfree(void *ptr)
+void xfree_(void *ptr)
 {
 	if (ptr)
 		free(ptr);
 }
 
-void *xrealloc(void *ptr, int size)
+void *xrealloc_(void *ptr, int size, char *a, int b)
 {
 	void *tmp = realloc(ptr, size);
 
 	if (!tmp)
-		oom_handler();
+		oom_handler(a, b);
 
 	return tmp;
 }
 
-char *xstrdup(const char *s)
+char *xstrdup_(const char *s, char *a, int b)
 {
 	char *tmp;
 
 	if (!s)
 		return NULL;
 
 	if (!(tmp = strdup(s)))
-		oom_handler();
+		oom_handler(a, b);
 
 	return tmp;
 }

xmalloc.h

@@ -20,12 +20,16 @@
 #ifndef __XMALLOC_H
 #define __XMALLOC_H
 
-#define xcalloc(x,y) xcalloc_(x,y,__LINE__,__FILE__)
+#define xcalloc(x,y) xcalloc_(x,y,__FILE__,__LINE__)
+#define xmalloc(x) xmalloc_(x,__FILE__,__LINE__)
+#define xfree(x) xfree_(x,__FILE__,__LINE__)
+#define xrealloc(x,y) xrealloc_(x,y,__FILE__,__LINE__)
+#define xstrdup(x) xstrdup_(x,__FILE__,__LINE__)
 
-void *xcalloc_(int nmemb, int size, char *a, char *b);
-void *xmalloc_(int size);
-void xfree_(void *ptr);
-void *xrealloc_(void *ptr, int size);
-char *xstrdup_(const char *s);
+void *xcalloc_(int nmemb, int size, char *a, int b);
+void *xmalloc_(int size, char *a, int b);
+void xfree_(void *ptr, char *a, int b);
+void *xrealloc_(void *ptr, int size, char *a, int b);
+char *xstrdup_(const char *s, char *a, int b);
 
 #endif /* __XMALLOC_H */