1 files changed, 35 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/i386/sbrk.c b/libc/sysdeps/linux/i386/sbrk.c
new file mode 100644
index 000000000..f5099d7e8
--- /dev/null
+++ b/libc/sysdeps/linux/i386/sbrk.c
@@ -0,0 +1,35 @@
+/* From libc-5.3.12 */
+
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <errno.h>
+
+extern void * ___brk_addr;
+
+extern int __init_brk (void);
+
+void *
+sbrk(ptrdiff_t increment)
+{
+    if (__init_brk () == 0)
+    {
+	void * tmp = ___brk_addr+increment;
+#if defined(__PIC__) || defined (__pic__)
+	__asm__ volatile ("pushl %%ebx\n\t"
+			  "movl %%ecx,%%ebx\n\t"
+                          "int $0x80\n\t"
+                          "popl %%ebx"
+		:"=a" (___brk_addr)
+		:"0" (SYS_brk),"c" (tmp));
+#else
+	__asm__ volatile ("int $0x80"
+		:"=a" (___brk_addr)
+		:"0" (SYS_brk),"b" (tmp));
+#endif
+	if (___brk_addr == tmp)
+		return tmp-increment;
+	errno = ENOMEM;
+	return ((void *) -1);
+    }
+    return ((void *) -1);
+}