Execute a program and give access to its io An object of this class encapsulates the execution of an external program. More...

#include <ExternalProgram.h>

Inheritance diagram for zypp::ExternalProgram:

Public Types
enum	Stderr_Disposition { Normal_Stderr, Discard_Stderr, Stderr_To_Stdout, Stderr_To_FileDesc }
	Define symbols for different policies on the handling of stderr. More...

typedef std::vector< std::string >	Arguments

typedef std::map< std::string, std::string >	Environment
	For passing additional environment variables to set. More...

Public Member Functions
	ExternalProgram (std::string commandline, Stderr_Disposition stderr_disp=Normal_Stderr, bool use_pty=false, int stderr_fd=-1, bool default_locale=false, const Pathname &root="")
	Start the external program by using the shell `/bin/sh with the option -c.` More...

	ExternalProgram ()
	Start an external program by giving the arguments as an arry of char *pointers. More...

	ExternalProgram (const Arguments &argv, Stderr_Disposition stderr_disp=Normal_Stderr, bool use_pty=false, int stderr_fd=-1, bool default_locale=false, const Pathname &root="")

	ExternalProgram (const Arguments &argv, const Environment &environment, Stderr_Disposition stderr_disp=Normal_Stderr, bool use_pty=false, int stderr_fd=-1, bool default_locale=false, const Pathname &root="")

	ExternalProgram (const char const argv, Stderr_Disposition stderr_disp=Normal_Stderr, bool use_pty=false, int stderr_fd=-1, bool default_locale=false, const Pathname &root="")

	ExternalProgram (const char const argv, const Environment &environment, Stderr_Disposition stderr_disp=Normal_Stderr, bool use_pty=false, int stderr_fd=-1, bool default_locale=false, const Pathname &root="")

	ExternalProgram (const char binpath, const char const *argv_1, bool use_pty=false)

	ExternalProgram (const char binpath, const char const *argv_1, const Environment &environment, bool use_pty=false)

	~ExternalProgram ()

int	close ()
	Wait for the progamm to complete. More...

bool	kill ()
	Kill the program. More...

bool	running ()
	Return whether program is running. More...

pid_t	getpid ()
	return pid More...

const std::string &	command () const
	The command we're executing. More...

const std::string &	execError () const
	Some detail telling why the execution failed, if it failed. More...

std::ostream &	operator>> (std::ostream &out_r)
	Redirect all command output to an `ostream`. More...

Public Member Functions inherited from zypp::externalprogram::ExternalDataSource
	ExternalDataSource (FILE inputfile=0, FILE outputfile=0)
	Create a new instance. More...

virtual	~ExternalDataSource ()
	Implicitly close the connection. More...

bool	send (const char *buffer, size_t length)
	Send some data to the output stream. More...

bool	send (std::string s)
	Send some data down the stream. More...

size_t	receive (char *buffer, size_t length)
	Read some data from the input stream. More...

std::string	receiveLine ()
	Read one line from the input stream. More...

std::string	receiveUpto (char c)
	Read characters into a string until character c is read. More...

void	setBlocking (bool mode)
	Set the blocking mode of the input stream. More...

FILE *	inputFile () const
	Return the input stream. More...

FILE *	outputFile () const
	Return the output stream. More...

Static Public Member Functions
static void	renumber_fd (int origfd, int newfd)
	origfd will be accessible as newfd and closed (unless they were equal) More...

Protected Member Functions
int	checkStatus (int)

Private Member Functions
void	start_program (const char const argv, const Environment &environment, Stderr_Disposition stderr_disp=Normal_Stderr, int stderr_fd=-1, bool default_locale=false, const char *root=NULL)

Private Attributes
bool	use_pty
	Set to true, if a pair of ttys is used for communication instead of a pair of pipes. More...

pid_t	pid

int	_exitStatus

std::string	_command
	Store the command we're executing. More...

std::string	_execError
	Remember execution errors like failed fork/exec. More...

Additional Inherited Members
Protected Attributes inherited from zypp::externalprogram::ExternalDataSource
FILE *	inputfile

FILE *	outputfile

Detailed Description

Execute a program and give access to its io An object of this class encapsulates the execution of an external program.

It starts the program using fork and some exec.. call, gives you access to the program's stdio and closes the program after use.

*
* const char* argv[] =
* {
*     "/usr/bin/foo,
*     "--option1",
*     "--option2",
*     NULL
* };
*
* ExternalProgram prog( argv,
*                        ExternalProgram::Discard_Stderr,
*                        false, -1, true);
* string line;
* for(line = prog.receiveLine();
*     ! line.empty();
*     line = prog.receiveLine() )
* {
*     stream << line;
* }
* prog.close();
*
* 

Definition at line 58 of file ExternalProgram.h.

Member Typedef Documentation

typedef std::vector<std::string> zypp::ExternalProgram::Arguments

Definition at line 63 of file ExternalProgram.h.

typedef std::map<std::string,std::string> zypp::ExternalProgram::Environment

For passing additional environment variables to set.

Definition at line 80 of file ExternalProgram.h.

Member Enumeration Documentation

enum zypp::ExternalProgram::Stderr_Disposition

Define symbols for different policies on the handling of stderr.

Enumerator
Normal_Stderr
Discard_Stderr
Stderr_To_Stdout
Stderr_To_FileDesc

Definition at line 69 of file ExternalProgram.h.

Constructor & Destructor Documentation

zypp::ExternalProgram::ExternalProgram	(	std::string	commandline,
		Stderr_Disposition	stderr_disp = `Normal_Stderr`,
		bool	use_pty = `false`,
		int	stderr_fd = `-1`,
		bool	default_locale = `false`,
		const Pathname &	root = `""`
	)

Start the external program by using the shell /bin/sh with the option -c.

You can use io direction symbols < and >.

Parameters

commandline	a shell commandline that is appended to `/bin/sh -c`.
default_locale	whether to set LC_ALL=C before starting
root	directory to chroot into, / or empty to not chroot

Definition at line 42 of file ExternalProgram.cc.

zypp::ExternalProgram::ExternalProgram ( )

Start an external program by giving the arguments as an arry of char *pointers.

If environment is provided, varaiables will be added to the childs environment, overwriting existing ones.

Initial args starting with # are discarded but some are treated specially: #/[path] - chdir to /[path] before executing

Stdin redirection: If the 1st argument starts with a '<', the remaining part is treated as file opened for reading on standard input (or /dev/null if empty).

*   // cat file /tmp/x
*   const char* argv[] = { "</tmp/x", "cat", NULL };
*   ExternalProgram prog( argv );
* 

Definition at line 35 of file ExternalProgram.cc.

zypp::ExternalProgram::ExternalProgram	(	const Arguments &	argv,
		Stderr_Disposition	stderr_disp = `Normal_Stderr`,
		bool	use_pty = `false`,
		int	stderr_fd = `-1`,
		bool	default_locale = `false`,
		const Pathname &	root = `""`
	)

Definition at line 67 of file ExternalProgram.cc.

zypp::ExternalProgram::ExternalProgram	(	const Arguments &	argv,
		const Environment &	environment,
		Stderr_Disposition	stderr_disp = `Normal_Stderr`,
		bool	use_pty = `false`,
		int	stderr_fd = `-1`,
		bool	default_locale = `false`,
		const Pathname &	root = `""`
	)

Definition at line 94 of file ExternalProgram.cc.

zypp::ExternalProgram::ExternalProgram	(	const char const	argv,
		Stderr_Disposition	stderr_disp = `Normal_Stderr`,
		bool	use_pty = `false`,
		int	stderr_fd = `-1`,
		bool	default_locale = `false`,
		const Pathname &	root = `""`
	)

Definition at line 124 of file ExternalProgram.cc.

zypp::ExternalProgram::ExternalProgram	(	const char const	argv,
		const Environment &	environment,
		Stderr_Disposition	stderr_disp = `Normal_Stderr`,
		bool	use_pty = `false`,
		int	stderr_fd = `-1`,
		bool	default_locale = `false`,
		const Pathname &	root = `""`
	)

Definition at line 143 of file ExternalProgram.cc.

zypp::ExternalProgram::ExternalProgram	(	const char *	binpath,
		const char const	argv_1,
		bool	use_pty = `false`
	)

Definition at line 159 of file ExternalProgram.cc.

zypp::ExternalProgram::ExternalProgram	(	const char *	binpath,
		const char const	argv_1,
		const Environment &	environment,
		bool	use_pty = `false`
	)

Definition at line 175 of file ExternalProgram.cc.

zypp::ExternalProgram::~ExternalProgram ( )

Definition at line 190 of file ExternalProgram.cc.

Member Function Documentation

int zypp::ExternalProgram::close ( )

virtual

Wait for the progamm to complete.

Reimplemented from zypp::externalprogram::ExternalDataSource.

Definition at line 414 of file ExternalProgram.cc.

bool zypp::ExternalProgram::kill ( )

Kill the program.

Definition at line 529 of file ExternalProgram.cc.

bool zypp::ExternalProgram::running ( )

Return whether program is running.

Definition at line 541 of file ExternalProgram.cc.

pid_t zypp::ExternalProgram::getpid ( )

inline

return pid

Definition at line 161 of file ExternalProgram.h.

const std::string& zypp::ExternalProgram::command ( ) const

inline

The command we're executing.

Definition at line 164 of file ExternalProgram.h.

const std::string& zypp::ExternalProgram::execError ( ) const

inline

Some detail telling why the execution failed, if it failed.

Empty if the command is still running or successfully completed.

Can't open pty (s).
Can't open pipe (s).
Can't fork (s).
Command exited with status d.
Command was killed by signal d (s).

Definition at line 176 of file ExternalProgram.h.

void zypp::ExternalProgram::renumber_fd	(	int	origfd,
		int	newfd
	)

static

origfd will be accessible as newfd and closed (unless they were equal)

Definition at line 565 of file ExternalProgram.cc.

std::ostream & zypp::ExternalProgram::operator>> ( std::ostream & out_r )

Redirect all command output to an ostream.

Returns when the command has completed.

*   std::ostringstream s;
*   ExternalProgram("pwd") >> s;
*   SEC << s.str() << endl;
* 

*   std::ostringstream s;
*   ExternalProgram prog("ls -l wrzl");
*   prog >> s;
*   if ( prog.close() == 0 )
*     MIL << s.str() << endl;
*   else
*     ERR << prog.execError() << endl;
* 

Definition at line 577 of file ExternalProgram.cc.

int zypp::ExternalProgram::checkStatus ( int status )

protected

Definition at line 489 of file ExternalProgram.cc.

void zypp::ExternalProgram::start_program	(	const char const	argv,
		const Environment &	environment,
		Stderr_Disposition	stderr_disp = `Normal_Stderr`,
		int	stderr_fd = `-1`,
		bool	default_locale = `false`,
		const char *	root = `NULL`
	)

private

Definition at line 196 of file ExternalProgram.cc.

Member Data Documentation

bool zypp::ExternalProgram::use_pty

private

Set to true, if a pair of ttys is used for communication instead of a pair of pipes.

Definition at line 215 of file ExternalProgram.h.

pid_t zypp::ExternalProgram::pid

private

Definition at line 217 of file ExternalProgram.h.

int zypp::ExternalProgram::_exitStatus

private

Definition at line 218 of file ExternalProgram.h.

std::string zypp::ExternalProgram::_command

private

Store the command we're executing.

Definition at line 220 of file ExternalProgram.h.

std::string zypp::ExternalProgram::_execError

private

Remember execution errors like failed fork/exec.

Definition at line 222 of file ExternalProgram.h.

The documentation for this class was generated from the following files:

zypp/ExternalProgram.h
zypp/ExternalProgram.cc

Public Types

Public Member Functions

Static Public Member Functions

Protected Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Member Typedef Documentation

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation