From 3ca027ca8219dbdbb6467645944c4daada037f51 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <superjoe30@gmail.com>
Date: Fri, 31 Mar 2017 05:48:15 -0400
Subject: first pass at zig build system

 * `zig build --export [obj|lib|exe]` changed to `zig build_obj`,
   `zig build_lib` and `zig build_exe` respectively.
 * `--name` parameter is optional when it can be inferred from the
   root source filename. closes #207
 * `zig build` now looks for `build.zig` which interacts with
   `std.build.Builder` to describe the targets, and then the zig
   build system prints TODO: build these targets. See #204
 * add `@bitcast` which is mainly used for pointer reinterpret
   casting and make explicit casting not do pointer reinterpretation.
   Closes #290
 * fix debug info for byval parameters
 * sort command line help options
 * `std.debug.panic` supports format string printing
 * add `std.mem.IncrementingAllocator`
 * fix const ptr to a variable with data changing at runtime.
   closes #289
---
 std/os/linux.zig | 35 ++++++++++++++++++++++++-----------
 1 file changed, 24 insertions(+), 11 deletions(-)

(limited to 'std/os')

diff --git a/std/os/linux.zig b/std/os/linux.zig
index be86136dee..0e616cfc53 100644
--- a/std/os/linux.zig
+++ b/std/os/linux.zig
@@ -5,16 +5,29 @@ const arch = switch (@compileVar("arch")) {
 };
 const errno = @import("errno.zig");
 
-pub const MMAP_PROT_NONE =  0;
-pub const MMAP_PROT_READ =  1;
-pub const MMAP_PROT_WRITE = 2;
-pub const MMAP_PROT_EXEC =  4;
-
-pub const MMAP_MAP_FILE =    0;
-pub const MMAP_MAP_SHARED =  1;
-pub const MMAP_MAP_PRIVATE = 2;
-pub const MMAP_MAP_FIXED =   16;
-pub const MMAP_MAP_ANON =    32;
+pub const PROT_NONE      = 0;
+pub const PROT_READ      = 1;
+pub const PROT_WRITE     = 2;
+pub const PROT_EXEC      = 4;
+pub const PROT_GROWSDOWN = 0x01000000;
+pub const PROT_GROWSUP   = 0x02000000;
+
+pub const MAP_FAILED     = @maxValue(usize);
+pub const MAP_SHARED     = 0x01;
+pub const MAP_PRIVATE    = 0x02;
+pub const MAP_TYPE       = 0x0f;
+pub const MAP_FIXED      = 0x10;
+pub const MAP_ANONYMOUS  = 0x20;
+pub const MAP_NORESERVE  = 0x4000;
+pub const MAP_GROWSDOWN  = 0x0100;
+pub const MAP_DENYWRITE  = 0x0800;
+pub const MAP_EXECUTABLE = 0x1000;
+pub const MAP_LOCKED     = 0x2000;
+pub const MAP_POPULATE   = 0x8000;
+pub const MAP_NONBLOCK   = 0x10000;
+pub const MAP_STACK      = 0x20000;
+pub const MAP_HUGETLB    = 0x40000;
+pub const MAP_FILE       = 0;
 
 pub const SIGHUP    = 1;
 pub const SIGINT    = 2;
@@ -226,7 +239,7 @@ pub const AF_MAX = PF_MAX;
 
 /// Get the errno from a syscall return value, or 0 for no error.
 pub fn getErrno(r: usize) -> usize {
-    const signed_r = *(&isize)(&r);
+    const signed_r = *@bitcast(&isize, &r);
     if (signed_r > -4096 and signed_r < 0) usize(-signed_r) else 0
 }
 
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