Make some systemic improvements

- add vdso dump utility
- tests now log stack usage
- rename g_ftrace to __ftrace
- make internal spinlocks go faster
- add conformant c11 atomics library
- function tracing now logs stack usage
- make function call tracing thread safe
- add -X unsecure (no ssl) mode to redbean
- munmap() has more consistent behavior now
- pacify fsync() calls on python unit tests
- make --strace flag work better in redbean
- start minimizing and documenting compiler flags

libc/sysv/strace.greg.c

@@ -16,6 +16,28 @@
 │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
-#include "libc/calls/strace.internal.h"
+#include "libc/runtime/runtime.h"
 
-int __strace;
+/**
+ * System call logging enabled state.
+ *
+ * If Cosmopolitan was compiled with the `SYSDEBUG` macro (this is the
+ * default behavior, except in tiny and release modes) then `__strace`
+ * shall control whether or not system calls are logged to fd 2. If it's
+ * greater than zero, syscalls are logged. Otherwise, they're aren't.
+ *
+ * By convention, functions wishing to disable syscall tracing for a
+ * short time period should say:
+ *
+ *     void foo() {
+ *       --__strace;
+ *       bar();
+ *       ++__strace;
+ *     }
+ *
+ * This way you still have some flexibility to force syscall tracing, by
+ * setting `__strace` to a higher number like `2` or `200`. Even though
+ * under normal circumstances, `__strace` should only be either zero or
+ * one.
+ */
+_Atomic(int) __strace;

libc/sysv/syscount.S

@@ -26,26 +26,26 @@
 //	wouldn't impact this counter.
 	.bss
 	.align	8
-g_syscount:
+__syscount:
 	.quad	0
-	.endobj	g_syscount,globl
+	.endobj	__syscount,globl
 	.previous
 
-	.initbss 701,_init_g_syscount
-g_syscount_next:
+	.initbss 701,_init___syscount
+__syscount_next:
 	.quad	0
-	.endobj	g_syscount_next
+	.endobj	__syscount_next
 	.previous
 
 syscount:
-	incq	g_syscount(%rip)
-	jmp	*g_syscount_next(%rip)
+	incq	__syscount(%rip)
+	jmp	*__syscount_next(%rip)
 	.endfn	syscount
 	.previous
 
-	.init.start 701,_init_g_syscount
+	.init.start 701,_init___syscount
 	mov	__systemfive(%rip),%rax
 	stosq
 	ezlea	syscount,ax
 	mov	%rax,__systemfive(%rip)
-	.init.end 701,_init_g_syscount
+	.init.end 701,_init___syscount

libc/sysv/sysv.mk

@@ -33,7 +33,7 @@ LIBC_SYSV_A_DIRECTDEPS =				\
 LIBC_SYSV_A_FILES :=					\
 	libc/sysv/macros.internal.h			\
 	libc/sysv/errfuns.h				\
-	libc/sysv/g_syscount.S				\
+	libc/sysv/syscount.S				\
 	libc/sysv/restorert.S				\
 	libc/sysv/syscall.S				\
 	libc/sysv/systemfive.S				\
@@ -75,9 +75,11 @@ o/libc/sysv/consts/syscon.internal.inc:			\
 		libc/macros-cpp.internal.inc		\
 		libc/macros.internal.inc
 
+# we can't use asan and ubsan because:
+#   we're higher in the topological order of things
 o/$(MODE)/libc/sysv/errno.greg.o:			\
 		OVERRIDE_CFLAGS +=			\
-			$(NO_MAGIC)
+			-fno-sanitize=all
 
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