Add support for some mmap.h functions (#286)

Author: brianquinlan

pkgs/unix_api/constants.yaml

@@ -1,3 +1,25 @@
+"<sys/mman.h>":
+  - MAP_ANONYMOUS
+  - MAP_FIXED
+  - MAP_PRIVATE
+  - MAP_SHARED
+  - MCL_CURRENT
+  - MCL_FUTURE
+  - MS_ASYNC
+  - MS_INVALIDATE
+  - MS_SYNC
+  - POSIX_MADV_DONTNEED
+  - POSIX_MADV_NORMAL
+  - POSIX_MADV_RANDOM
+  - POSIX_MADV_SEQUENTIAL
+  - POSIX_MADV_WILLNEED
+  - POSIX_TYPED_MEM_ALLOCATE
+  - POSIX_TYPED_MEM_ALLOCATE_CONTIG
+  - POSIX_TYPED_MEM_MAP_ALLOCATABLE
+  - PROT_EXEC
+  - PROT_NONE
+  - PROT_READ
+  - PROT_WRITE
 "<sys/stat.h>":
   - AT_SYMLINK_NOFOLLOW
   - AT_RESOLVE_BENEATH
@@ -34,9 +56,11 @@
   - UF_HIDDEN
 "<errno.h>":
   - EACCES
+  - EBADF
   - EDOM
   - EEXIST
   - EINTR
+  - EINVAL
   - EMFILE
   - ENOENT
   - ENOSPC

pkgs/unix_api/functions.yaml

@@ -22,6 +22,30 @@
   - prototype: "char *strerror(int)"
     comment: "Formats an error code as a string."
     url: "https://pubs.opengroup.org/onlinepubs/9699919799/functions/strerror.html"
+"<sys/mman.h>":
+  - prototype: "int mlock(const void *, size_t)"
+    comment: "Locks a range of process address space."
+    url: "https://pubs.opengroup.org/onlinepubs/9699919799/functions/mlock.html"
+    error_value: "-1"
+  - prototype: "int mlockall(int)"
+    comment: "Locks the processes address space."
+    url: "https://pubs.opengroup.org/onlinepubs/9699919799/functions/mlockall.html"
+  - prototype: "void *mmap(void *, size_t, int, int, int, off_t)"
+    comment: "Maps pages of memory."
+    url: "https://pubs.opengroup.org/onlinepubs/9699919799/functions/mmap.html"
+    error_value: "MAP_FAILED"
+  - prototype: "int mprotect(void *, size_t, int)"
+    comment: "Sets the protection of mapped memory."
+    url: "https://pubs.opengroup.org/onlinepubs/9699919799/functions/mprotect.html"
+    error_value: "-1"
+  - prototype: "int munlock(const void *, size_t)"
+    comment: Unlocks a range of process address space."
+    url: "https://pubs.opengroup.org/onlinepubs/9699919799/functions/munlock.html"
+    error_value: "-1"
+  - prototype: "int munmap(void *, size_t)"
+    comment: "Unmaps pages of memory."
+    url: "https://pubs.opengroup.org/onlinepubs/9699919799/functions/munmap.html"
+    error_value: "-1"
 "<sys/stat.h>":
   - prototype: "int chmod(const char *, mode_t)"
     comment: "Changes the mode of a file."

pkgs/unix_api/handwritten-constants-ffigen.yaml

@@ -0,0 +1,18 @@
+# Run with `dart run ffigen --config constants-ffigen.yaml`.
+name: NativeAddBindings
+description: |
+  Bindings for `handwritten_constants.h`.
+
+  Regenerate bindings with `dart run tool/generate.dart`.
+output: 'lib/src/handwritten_constant_bindings.g.dart'
+headers:
+  entry-points:
+    - 'src/handwritten_constants.h'
+
+  include-directives:
+    - 'src/handwritten_constants.h'
+comments:
+  style: any
+  length: full
+ffi-native:
+  asset-id: package:unix_api/libc_shim

pkgs/unix_api/hook/build.dart

@@ -17,7 +17,12 @@ void main(List<String> args) async {
       libraries: [
         if ([OS.linux].contains(input.config.code.targetOS)) 'crypt',
       ],
-      sources: ['src/libc_shim.c', 'src/constants.g.c', 'src/functions.g.c'],
+      sources: [
+        'src/libc_shim.c',
+        'src/constants.g.c',
+        'src/functions.g.c',
+        'src/handwritten_constants.c',
+      ],
       flags: ['-Weverything'],
     ).run(
       input: input,