Non-SFI mode: Add syscalls which are needed for nacl_helper_nonsfi's sandbox.

src/nonsfi/linux/abi_conversion.h

Index: src/nonsfi/linux/abi_conversion.h
diff --git a/src/nonsfi/linux/abi_conversion.h b/src/nonsfi/linux/abi_conversion.h
index 8afd4a13fd29435fe3fb6d3a716f395112338e41..81aa55fffbd98899c2242bef4d1c70e92e62130d 100644
--- a/src/nonsfi/linux/abi_conversion.h
+++ b/src/nonsfi/linux/abi_conversion.h
@@ -7,6 +7,7 @@
 #ifndef NATIVE_CLIENT_SRC_NONSFI_LINUX_ABI_CONVERSION_H_
 #define NATIVE_CLIENT_SRC_NONSFI_LINUX_ABI_CONVERSION_H_ 1
 
+#include <fcntl.h>
 #include <stdint.h>
 #include <string.h>
 #include <sys/stat.h>
@@ -70,6 +71,74 @@ struct linux_abi_stat64 {
 # error Unsupported architecture
 #endif
 
+/* We do not use O_RDONLY for abi conversion because it is 0. */
+#define LINUX_O_WRONLY 01
+#define LINUX_O_RDWR 02
+#define LINUX_O_CREAT 0100
+#define LINUX_O_TRUNC 01000
+#define LINUX_O_APPEND 02000
+#define LINUX_O_EXCL 0200
+#define LINUX_O_NONBLOCK 04000
+#define LINUX_O_SYNC 04010000
+#define LINUX_O_ASYNC 020000
+
+#if defined(__i386__)
+# define LINUX_O_DIRECTORY 0200000
+#elif defined(__arm__)
+# define LINUX_O_DIRECTORY 040000
+#else
+# error Unsupported architecture
+#endif
+
+#define LINUX_O_CLOEXEC 02000000
+
+#define NACL_KNOWN_O_FLAGS (O_ACCMODE | O_CREAT | O_TRUNC | O_APPEND | \
+                            O_EXCL | O_NONBLOCK | O_SYNC | O_ASYNC | \
+                            O_DIRECTORY | O_CLOEXEC)
+
+/* Converts open flags from NaCl's to Linux's ABI. */
+static inline int nacl_oflags_to_linux_oflags(int nacl_oflags) {
+  if (nacl_oflags & ~NACL_KNOWN_O_FLAGS) {
+    /* Unknown bit is found. */
+    return -1;
+  }
+#define NACL_TO_LINUX(name) ((nacl_oflags & name) ? LINUX_ ## name : 0)
+  return (NACL_TO_LINUX(O_WRONLY) |
+          NACL_TO_LINUX(O_RDWR) |
+          NACL_TO_LINUX(O_CREAT) |
+          NACL_TO_LINUX(O_TRUNC) |
+          NACL_TO_LINUX(O_APPEND) |
+          NACL_TO_LINUX(O_EXCL) |
+          NACL_TO_LINUX(O_NONBLOCK) |
+          NACL_TO_LINUX(O_SYNC) |
+          NACL_TO_LINUX(O_ASYNC) |
+          NACL_TO_LINUX(O_DIRECTORY) |
+          NACL_TO_LINUX(O_CLOEXEC));
+#undef NACL_TO_LINUX
+}
+
+/* Converts open flags from Linux's to NaCl's ABI. */
+static inline int linux_oflags_to_nacl_oflags(int linux_oflags) {
+  /*
+   * Because O_SYNC has two 1-bits. So we cannot use the same validation
+   * check. We ignore unknown flags in this case.
+   */
+#define LINUX_TO_NACL(name) \
+    (((linux_oflags & LINUX_ ## name) == LINUX_ ## name) ? name : 0)
+  return (LINUX_TO_NACL(O_WRONLY) |
+          LINUX_TO_NACL(O_RDWR) |
+          LINUX_TO_NACL(O_CREAT) |
+          LINUX_TO_NACL(O_TRUNC) |
+          LINUX_TO_NACL(O_APPEND) |
+          LINUX_TO_NACL(O_EXCL) |
+          LINUX_TO_NACL(O_NONBLOCK) |
+          LINUX_TO_NACL(O_SYNC) |
+          LINUX_TO_NACL(O_ASYNC) |
+          LINUX_TO_NACL(O_DIRECTORY) |
+          LINUX_TO_NACL(O_CLOEXEC));
+#undef LINUX_TO_NACL
+}
+
 /* Converts the timespec struct from NaCl's to Linux's ABI. */
 static inline void nacl_timespec_to_linux_timespec(
     const struct timespec *nacl_timespec,