Malloc flag X makes malloc behave like the canonical xmalloc() wrapper.

Untested support for Solaris from John-Mark Gurney

Reviewed by:	phk
Submitted by:	(partially) John-Mark Gurney <gurney_j@resnet.uoregon.edu>

lib/libc/stdlib/malloc.3

@@ -34,7 +34,7 @@
 .\" SUCH DAMAGE.
 .\"
 .\"     @(#)malloc.3	8.1 (Berkeley) 6/4/93
-.\"     $Id: malloc.3,v 1.8 1997/02/22 15:03:10 peter Exp $
+.\"     $Id: malloc.3,v 1.9 1997/03/22 23:48:12 mpp Exp $
 .\"
 .Dd August 27, 1996
 .Dt MALLOC 3
@@ -149,6 +149,18 @@ This can substantially aid in compacting memory.
 ``utrace'' generate entries for ktrace(1) for all operations.
 Consult the source for this one.
 
+.It X
+``xmalloc'' 
+rather than return failure,
+.Xr abort 3
+the program with a diagnostic message on stderr.
+It is the intention that this option be set at compile time by
+including in the source:
+.Bd -literal -offset indent
+extern char *malloc_options;
+malloc_options = "X";
+.Ed
+
 .It Z
 ``zero'' fill some junk into the area allocated (see ``J''),
 except for the exact length the user asked for, which is zeroed.

lib/libc/stdlib/malloc.c

@@ -6,7 +6,7 @@
  * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
  * ----------------------------------------------------------------------------
  *
- * $Id: malloc.c,v 1.21 1997/02/22 15:03:12 peter Exp $
+ * $Id: malloc.c,v 1.22 1997/03/18 07:54:24 phk Exp $
  *
  */
 
@@ -56,12 +56,32 @@
 #   define malloc_minsize		16U
 #endif /* __i386__ && __FreeBSD__ */
 
+#if defined(__sparc__)
+#   define malloc_pageshirt		12U
+#   define malloc_minsize		16U
+#   define MAP_ANON			(0)
+#   define USE_DEV_ZERO
+#   define MADV_FREE			MADV_DONTNEED
+#endif /* __sparc__ */
+
 /* Insert your combination here... */
 #if defined(__FOOCPU__) && defined(__BAROS__)
 #   define malloc_pageshift		12U
 #   define malloc_minsize		16U
 #endif /* __i386__ && __FreeBSD__ */
 
+#ifdef _THREAD_SAFE
+#include <pthread.h>
+static pthread_mutex_t malloc_lock;
+#define THREAD_LOCK()		pthread_mutex_lock(&malloc_lock)
+#define THREAD_UNLOCK()		pthread_mutex_unlock(&malloc_lock)
+#define THREAD_LOCK_INIT()	pthread_mutex_init(&malloc_lock, 0);
+#else
+#define THREAD_LOCK()
+#define THREAD_UNLOCK()
+#define THREAD_LOCK_INIT()
+#endif
+
 /*
  * No user serviceable parts behind this point.
  */
@@ -69,6 +89,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <fcntl.h>
 #include <errno.h>
 #include <sys/types.h>
 #include <sys/mman.h>
@@ -144,6 +165,18 @@ struct pgfree {
 #define pageround(foo) (((foo) + (malloc_pagemask))&(~(malloc_pagemask)))
 #define ptr2index(foo) (((u_long)(foo) >> malloc_pageshift)-malloc_origo)
 
+/* fd of /dev/zero */
+#ifdef USE_DEV_ZERO
+static int fdzero;
+#define	MMAP_FD	fdzero
+#define INIT_MMAP() \
+	{ if ((fdzero=open("/dev/zero", O_RDWR, 0000)) == -1) \
+	    wrterror("open of /dev/zero"); }
+#else
+#define MMAP_FD (-1)
+#define INIT_MMAP()
+#endif
+
 /* Set when initialization has been done */
 static unsigned malloc_started;	
 
@@ -180,6 +213,9 @@ static int malloc_realloc;
 /* pass the kernel a hint on free pages ?  */
 static int malloc_hint;
 
+/* xmalloc behaviour ?  */
+static int malloc_xmalloc;
+
 /* zero fill ?  */
 static int malloc_zero;
 
@@ -213,6 +249,11 @@ char *malloc_options;
 /* Name of the current public function */
 static char *malloc_func;
 
+/* Macro for mmap */
+#define MMAP(size) \
+	mmap((caddr_t)0, (size), PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, \
+	    MMAP_FD, 0);
+
 /*
  * Necessary function declarations
  */
@@ -285,11 +326,11 @@ static void
 wrterror(char *p)
 {
     char *q = " error: ";
-    suicide = 1;
     write(2, __progname, strlen(__progname));
     write(2, malloc_func, strlen(malloc_func));
     write(2, q, strlen(q));
     write(2, p, strlen(p));
+    suicide = 1;
 #ifdef MALLOC_STATS
     if (malloc_stats)
 	malloc_dump(stderr);
@@ -384,8 +425,7 @@ extend_pgdir(u_long index)
      */
 
     /* Get new pages */
-    new = (struct pginfo**) mmap(0, i * malloc_pagesize, PROT_READ|PROT_WRITE,
-				 MAP_ANON|MAP_PRIVATE, -1, 0);
+    new = (struct pginfo**) MMAP(i * malloc_pagesize);
     if (new == (struct pginfo **)-1)
 	return 0;
 
@@ -414,6 +454,9 @@ malloc_init ()
     char *p, b[64];
     int i, j;
 
+    THREAD_LOCK_INIT();
+
+    INIT_MMAP();
 
 #ifdef EXTRA_SANITY
     malloc_junk = 1;
@@ -447,6 +490,8 @@ malloc_init ()
 		case 'J': malloc_junk    = 1; break;
 		case 'u': malloc_utrace  = 0; break;
 		case 'U': malloc_utrace  = 1; break;
+		case 'x': malloc_xmalloc = 0; break;
+		case 'X': malloc_xmalloc = 1; break;
 		case 'z': malloc_zero    = 0; break;
 		case 'Z': malloc_zero    = 1; break;
 		default:
@@ -474,8 +519,8 @@ malloc_init ()
 #endif /* MALLOC_STATS */
 
     /* Allocate one page for the page directory */
-    page_dir = (struct pginfo **) mmap(0, malloc_pagesize, PROT_READ|PROT_WRITE,
-				       MAP_ANON|MAP_PRIVATE, -1, 0);
+    page_dir = (struct pginfo **) MMAP(malloc_pagesize);
+
     if (page_dir == (struct pginfo **) -1)
 	wrterror("mmap(2) failed, check limits.\n");
 
@@ -759,7 +804,7 @@ irealloc(void *ptr, size_t size)
     int i;
 
     if (suicide)
-	return 0;
+	abort();
 
     if (!malloc_started) {
 	wrtwarning("malloc() has never been called.\n");
@@ -1082,17 +1127,6 @@ ifree(void *ptr)
  * These are the public exported interface routines.
  */
 
-#ifdef _THREAD_SAFE
-#include <pthread.h>
-#include "pthread_private.h"
-static int malloc_lock;
-#define THREAD_LOCK() _thread_kern_sig_block(&malloc_lock);
-#define THREAD_UNLOCK() _thread_kern_sig_unblock(malloc_lock);
-#else
-#define THREAD_LOCK() 
-#define THREAD_UNLOCK()
-#endif
-
 static int malloc_active;
 
 void *
@@ -1111,6 +1145,8 @@ malloc(size_t size)
     UTRACE(0, size, r);
     malloc_active--;
     THREAD_UNLOCK();
+    if (malloc_xmalloc && !r)
+	wrterror("out of memory.\n");
     return (r);
 }
 
@@ -1154,5 +1190,7 @@ realloc(void *ptr, size_t size)
     UTRACE(ptr, size, r);
     malloc_active--;
     THREAD_UNLOCK();
+    if (malloc_xmalloc && !r)
+	wrterror("out of memory.\n");
     return (r);
 }