1 files changed, 276 insertions, 0 deletions
diff --git a/gfx/angle/checkout/src/common/system_utils_posix.cpp b/gfx/angle/checkout/src/common/system_utils_posix.cpp
new file mode 100644
index 0000000000..26501eb2a6
--- /dev/null
+++ b/gfx/angle/checkout/src/common/system_utils_posix.cpp
@@ -0,0 +1,276 @@
+//
+// Copyright 2018 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+// system_utils_posix.cpp: Implementation of POSIX OS-specific functions.
+
+#include "system_utils.h"
+
+#include <array>
+
+#include <dlfcn.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+namespace angle
+{
+
+namespace
+{
+struct ScopedPipe
+{
+    ~ScopedPipe()
+    {
+        closeEndPoint(0);
+        closeEndPoint(1);
+    }
+    void closeEndPoint(int index)
+    {
+        if (fds[index] >= 0)
+        {
+            close(fds[index]);
+            fds[index] = -1;
+        }
+    }
+    int fds[2] = {
+        -1,
+        -1,
+    };
+};
+
+void ReadEntireFile(int fd, std::string *out)
+{
+    out->clear();
+
+    while (true)
+    {
+        char buffer[256];
+        ssize_t bytesRead = read(fd, buffer, sizeof(buffer));
+
+        // If interrupted, retry.
+        if (bytesRead < 0 && errno == EINTR)
+        {
+            continue;
+        }
+
+        // If failed, or nothing to read, we are done.
+        if (bytesRead <= 0)
+        {
+            break;
+        }
+
+        out->append(buffer, bytesRead);
+    }
+}
+}  // anonymous namespace
+
+Optional<std::string> GetCWD()
+{
+    std::array<char, 4096> pathBuf;
+    char *result = getcwd(pathBuf.data(), pathBuf.size());
+    if (result == nullptr)
+    {
+        return Optional<std::string>::Invalid();
+    }
+    return std::string(pathBuf.data());
+}
+
+bool SetCWD(const char *dirName)
+{
+    return (chdir(dirName) == 0);
+}
+
+bool UnsetEnvironmentVar(const char *variableName)
+{
+    return (unsetenv(variableName) == 0);
+}
+
+bool SetEnvironmentVar(const char *variableName, const char *value)
+{
+    return (setenv(variableName, value, 1) == 0);
+}
+
+std::string GetEnvironmentVar(const char *variableName)
+{
+    const char *value = getenv(variableName);
+    return (value == nullptr ? std::string() : std::string(value));
+}
+
+const char *GetPathSeparator()
+{
+    return ":";
+}
+
+bool RunApp(const std::vector<const char *> &args,
+            std::string *stdoutOut,
+            std::string *stderrOut,
+            int *exitCodeOut)
+{
+    if (args.size() == 0 || args.back() != nullptr)
+    {
+        return false;
+    }
+
+    ScopedPipe stdoutPipe;
+    ScopedPipe stderrPipe;
+
+    // Create pipes for stdout and stderr.
+    if (stdoutOut && pipe(stdoutPipe.fds) != 0)
+    {
+        return false;
+    }
+    if (stderrOut && pipe(stderrPipe.fds) != 0)
+    {
+        return false;
+    }
+
+    pid_t pid = fork();
+    if (pid < 0)
+    {
+        return false;
+    }
+
+    if (pid == 0)
+    {
+        // Child.  Execute the application.
+
+        // Redirect stdout and stderr to the pipe fds.
+        if (stdoutOut)
+        {
+            if (dup2(stdoutPipe.fds[1], STDOUT_FILENO) < 0)
+            {
+                _exit(errno);
+            }
+        }
+        if (stderrOut)
+        {
+            if (dup2(stderrPipe.fds[1], STDERR_FILENO) < 0)
+            {
+                _exit(errno);
+            }
+        }
+
+        // Execute the application, which doesn't return unless failed.  Note: execv takes argv as
+        // `char * const *` for historical reasons.  It is safe to const_cast it:
+        //
+        // http://pubs.opengroup.org/onlinepubs/9699919799/functions/exec.html
+        //
+        // > The statement about argv[] and envp[] being constants is included to make explicit to
+        // future writers of language bindings that these objects are completely constant. Due to a
+        // limitation of the ISO C standard, it is not possible to state that idea in standard C.
+        // Specifying two levels of const- qualification for the argv[] and envp[] parameters for
+        // the exec functions may seem to be the natural choice, given that these functions do not
+        // modify either the array of pointers or the characters to which the function points, but
+        // this would disallow existing correct code. Instead, only the array of pointers is noted
+        // as constant.
+        execv(args[0], const_cast<char *const *>(args.data()));
+        _exit(errno);
+    }
+
+    // Parent.  Read child output from the pipes and clean it up.
+
+    // Close the write end of the pipes, so EOF can be generated when child exits.
+    stdoutPipe.closeEndPoint(1);
+    stderrPipe.closeEndPoint(1);
+
+    // Read back the output of the child.
+    if (stdoutOut)
+    {
+        ReadEntireFile(stdoutPipe.fds[0], stdoutOut);
+    }
+    if (stderrOut)
+    {
+        ReadEntireFile(stderrPipe.fds[0], stderrOut);
+    }
+
+    // Cleanup the child.
+    int status = 0;
+    do
+    {
+        pid_t changedPid = waitpid(pid, &status, 0);
+        if (changedPid < 0 && errno == EINTR)
+        {
+            continue;
+        }
+        if (changedPid < 0)
+        {
+            return false;
+        }
+    } while (!WIFEXITED(status) && !WIFSIGNALED(status));
+
+    // Retrieve the error code.
+    if (exitCodeOut)
+    {
+        *exitCodeOut = WEXITSTATUS(status);
+    }
+
+    return true;
+}
+
+class PosixLibrary : public Library
+{
+  public:
+    PosixLibrary(const char *libraryName)
+    {
+        char buffer[1000];
+        int ret = snprintf(buffer, 1000, "%s.%s", libraryName, GetSharedLibraryExtension());
+        if (ret > 0 && ret < 1000)
+        {
+            mModule = dlopen(buffer, RTLD_NOW);
+        }
+    }
+
+    ~PosixLibrary() override
+    {
+        if (mModule)
+        {
+            dlclose(mModule);
+        }
+    }
+
+    void *getSymbol(const char *symbolName) override
+    {
+        if (!mModule)
+        {
+            return nullptr;
+        }
+
+        return dlsym(mModule, symbolName);
+    }
+
+    void *getNative() const override { return mModule; }
+
+  private:
+    void *mModule = nullptr;
+};
+
+Library *OpenSharedLibrary(const char *libraryName, SearchType searchType)
+{
+    return new PosixLibrary(libraryName);
+}
+
+bool IsDirectory(const char *filename)
+{
+    struct stat st;
+    int result = stat(filename, &st);
+    return result == 0 && ((st.st_mode & S_IFDIR) == S_IFDIR);
+}
+
+bool IsDebuggerAttached()
+{
+    // This could have a fuller implementation.
+    // See https://cs.chromium.org/chromium/src/base/debug/debugger_posix.cc
+    return false;
+}
+
+void BreakDebugger()
+{
+    // This could have a fuller implementation.
+    // See https://cs.chromium.org/chromium/src/base/debug/debugger_posix.cc
+    abort();
+}
+}  // namespace angle