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5c792faa0e
This should make sure that most new uses use the std prefix. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210835 91177308-0d34-0410-b5e6-96231b3b80d8
153 lines
6.9 KiB
C++
153 lines
6.9 KiB
C++
//===- llvm/Support/Program.h ------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the llvm::sys::Program class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_PROGRAM_H
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#define LLVM_SUPPORT_PROGRAM_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/Support/Path.h"
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#include <system_error>
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namespace llvm {
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namespace sys {
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/// This is the OS-specific separator for PATH like environment variables:
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// a colon on Unix or a semicolon on Windows.
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#if defined(LLVM_ON_UNIX)
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const char EnvPathSeparator = ':';
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#elif defined (LLVM_ON_WIN32)
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const char EnvPathSeparator = ';';
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#endif
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/// @brief This struct encapsulates information about a process.
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struct ProcessInfo {
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#if defined(LLVM_ON_UNIX)
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typedef pid_t ProcessId;
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#elif defined(LLVM_ON_WIN32)
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typedef unsigned long ProcessId; // Must match the type of DWORD on Windows.
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typedef void * HANDLE; // Must match the type of HANDLE on Windows.
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/// The handle to the process (available on Windows only).
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HANDLE ProcessHandle;
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#else
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#error "ProcessInfo is not defined for this platform!"
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#endif
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/// The process identifier.
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ProcessId Pid;
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/// The return code, set after execution.
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int ReturnCode;
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ProcessInfo();
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};
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/// This function attempts to locate a program in the operating
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/// system's file system using some pre-determined set of locations to search
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/// (e.g. the PATH on Unix). Paths with slashes are returned unmodified.
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///
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/// It does not perform hashing as a shell would but instead stats each PATH
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/// entry individually so should generally be avoided. Core LLVM library
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/// functions and options should instead require fully specified paths.
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///
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/// @returns A string containing the path of the program or an empty string if
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/// the program could not be found.
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std::string FindProgramByName(const std::string& name);
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// These functions change the specified standard stream (stdin or stdout) to
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// binary mode. They return errc::success if the specified stream
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// was changed. Otherwise a platform dependent error is returned.
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std::error_code ChangeStdinToBinary();
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std::error_code ChangeStdoutToBinary();
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/// This function executes the program using the arguments provided. The
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/// invoked program will inherit the stdin, stdout, and stderr file
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/// descriptors, the environment and other configuration settings of the
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/// invoking program.
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/// This function waits for the program to finish, so should be avoided in
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/// library functions that aren't expected to block. Consider using
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/// ExecuteNoWait() instead.
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/// @returns an integer result code indicating the status of the program.
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/// A zero or positive value indicates the result code of the program.
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/// -1 indicates failure to execute
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/// -2 indicates a crash during execution or timeout
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int ExecuteAndWait(
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StringRef Program, ///< Path of the program to be executed. It is
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/// presumed this is the result of the FindProgramByName method.
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const char **args, ///< A vector of strings that are passed to the
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///< program. The first element should be the name of the program.
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///< The list *must* be terminated by a null char* entry.
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const char **env = nullptr, ///< An optional vector of strings to use for
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///< the program's environment. If not provided, the current program's
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///< environment will be used.
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const StringRef **redirects = nullptr, ///< An optional array of pointers
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///< to paths. If the array is null, no redirection is done. The array
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///< should have a size of at least three. The inferior process's
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///< stdin(0), stdout(1), and stderr(2) will be redirected to the
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///< corresponding paths.
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///< When an empty path is passed in, the corresponding file
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///< descriptor will be disconnected (ie, /dev/null'd) in a portable
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///< way.
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unsigned secondsToWait = 0, ///< If non-zero, this specifies the amount
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///< of time to wait for the child process to exit. If the time
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///< expires, the child is killed and this call returns. If zero,
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///< this function will wait until the child finishes or forever if
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///< it doesn't.
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unsigned memoryLimit = 0, ///< If non-zero, this specifies max. amount
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///< of memory can be allocated by process. If memory usage will be
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///< higher limit, the child is killed and this call returns. If zero
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///< - no memory limit.
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std::string *ErrMsg = nullptr, ///< If non-zero, provides a pointer to a
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///< string instance in which error messages will be returned. If the
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///< string is non-empty upon return an error occurred while invoking the
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///< program.
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bool *ExecutionFailed = nullptr);
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/// Similar to ExecuteAndWait, but returns immediately.
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/// @returns The \see ProcessInfo of the newly launced process.
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/// \note On Microsoft Windows systems, users will need to either call \see
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/// Wait until the process finished execution or win32 CloseHandle() API on
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/// ProcessInfo.ProcessHandle to avoid memory leaks.
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ProcessInfo
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ExecuteNoWait(StringRef Program, const char **args, const char **env = nullptr,
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const StringRef **redirects = nullptr, unsigned memoryLimit = 0,
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std::string *ErrMsg = nullptr, bool *ExecutionFailed = nullptr);
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/// Return true if the given arguments fit within system-specific
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/// argument length limits.
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bool argumentsFitWithinSystemLimits(ArrayRef<const char*> Args);
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/// This function waits for the process specified by \p PI to finish.
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/// \returns A \see ProcessInfo struct with Pid set to:
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/// \li The process id of the child process if the child process has changed
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/// state.
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/// \li 0 if the child process has not changed state.
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/// \note Users of this function should always check the ReturnCode member of
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/// the \see ProcessInfo returned from this function.
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ProcessInfo Wait(
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const ProcessInfo &PI, ///< The child process that should be waited on.
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unsigned SecondsToWait, ///< If non-zero, this specifies the amount of
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///< time to wait for the child process to exit. If the time expires, the
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///< child is killed and this function returns. If zero, this function
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///< will perform a non-blocking wait on the child process.
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bool WaitUntilTerminates, ///< If true, ignores \p SecondsToWait and waits
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///< until child has terminated.
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std::string *ErrMsg = nullptr ///< If non-zero, provides a pointer to a
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///< string instance in which error messages will be returned. If the
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///< string is non-empty upon return an error occurred while invoking the
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///< program.
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);
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}
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}
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#endif
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