Thread secure errno(3).

libc/errno/errno.cpp

@@ -1,6 +1,6 @@
 /*******************************************************************************
 
-    Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
+    Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2014.
 
     This file is part of the Sortix C Library.
 
@@ -25,20 +25,16 @@
 #define __SORTIX_STDLIB_REDIRECTS 0
 #include <errno.h>
 #include <stddef.h>
-#if !defined(__is_sortix_kernel)
-#include <stdio.h>
-#endif
+
+#if __STDC_HOSTED__
+
+extern "C" { int __thread errno = 0; }
+
+#else
 
 extern "C" { int global_errno = 0; }
 extern "C" { errno_location_func_t errno_location_func = NULL; }
 
-#if !defined(__is_sortix_kernel)
-extern "C" void init_error_functions()
-{
-	global_errno = 0;
-}
-#endif
-
 extern "C" int* get_errno_location(void)
 {
 	if ( errno_location_func ) { return errno_location_func(); }
@@ -49,3 +45,5 @@ extern "C" void set_errno_location_func(errno_location_func_t func)
 {
 	errno_location_func = func;
 }
+
+#endif

libc/include/errno.h

@@ -1,6 +1,6 @@
 /*******************************************************************************
 
-    Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013.
+    Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013, 2014.
 
     This file is part of the Sortix C Library.
 
@@ -107,6 +107,13 @@ __BEGIN_DECLS
 
 #define EOPNOTSUPP ENOTSUP
 
+#if __STDC_HOSTED__
+
+extern __thread int errno;
+#define errno errno
+
+#else
+
 /* Returns the address of the errno variable for this thread. */
 int* get_errno_location(void);
 
@@ -117,6 +124,8 @@ void set_errno_location_func(errno_location_func_t func);
 
 #define errno (*get_errno_location())
 
+#endif
+
 extern char* program_invocation_name;
 extern char* program_invocation_short_name;
 

libc/init/init.cpp

@@ -1,6 +1,6 @@
 /*******************************************************************************
 
-    Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
+    Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013, 2014.
 
     This file is part of the Sortix C Library.
 
@@ -30,7 +30,6 @@
 extern "C" { char* program_invocation_name; }
 extern "C" { char* program_invocation_short_name; }
 
-extern "C" void init_error_functions();
 extern "C" void init_stdio();
 extern "C" void init_signal();
 
@@ -54,9 +53,6 @@ extern "C" void initialize_standard_library(int argc, char* argv[])
 	program_invocation_name = (char*) argv0;
 	program_invocation_short_name = find_last_elem((char*) argv0);
 
-	// Initialize stuff such as errno.
-	init_error_functions();
-
 	// It's probably best to initialize the Unix signals early on.
 	init_signal();
 

libc/x64/syscall.S

@@ -1,6 +1,6 @@
 /*******************************************************************************
 
-    Copyright(C) Jonas 'Sortie' Termansen 2013.
+    Copyright(C) Jonas 'Sortie' Termansen 2013, 2014.
 
     This file is part of the Sortix C Library.
 
@@ -37,23 +37,10 @@ asm_syscall: /* syscall num in %rax. */
 	mov %rsp, %rbp
 	int $0x80
 	test %ecx, %ecx
-	jnz 1f
-	pop %rbp
-	ret
+	jz 1f
+	mov %fs:0, %rsi
+	mov %ecx, errno@tpoff(%rsi)
 1:
-	push %rbx
-	push %r12
-	push %r13
-	mov %ecx, %ebx # preserve: ret_errno
-	mov %rax, %r12 # preserve: ret_low
-	mov %rdx, %r13 # preserve: ret_high
-	call get_errno_location # get_errno_location()
-	mov %ebx, (%rax) # *get_errno_location() = ret_errno
-	mov %r12, %rax # restore: ret_low
-	mov %r13, %rdx # restore: ret_high
-	pop %r13
-	pop %r12
-	pop %rbx
 	pop %rbp
 	ret
 .size asm_syscall, .-asm_syscall

libc/x86/syscall.S

@@ -1,6 +1,6 @@
 /*******************************************************************************
 
-    Copyright(C) Jonas 'Sortie' Termansen 2013.
+    Copyright(C) Jonas 'Sortie' Termansen 2013, 2014.
 
     This file is part of the Sortix C Library.
 
@@ -49,13 +49,8 @@ asm_syscall: /* syscall num in %eax. */
 	int $0x80
 	test %ecx, %ecx # ret_errno & ret_errno
 	jz 1f # if ( !(ret_errno & ret_errno) )
-	mov %eax, %ebx # preserve: ret_low
-	mov %edx, %edi # preserve: ret_high
-	mov %ecx, %esi # preserve: ret_errno
-	call get_errno_location # get_errno_location()
-	mov %esi, (%eax) # *get_errno_location() = ret_errno
-	mov %ebx, %eax # restore: ret_low
-	mov %edi, %edx # restore: ret_high
+	mov %gs:0, %ebx
+	mov %ecx, errno@ntpoff(%ebx)
 1:
 	pop %esi
 	pop %edi