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a/src/utils/execmd.h |
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b/src/utils/execmd.h |
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* Free Software Foundation, Inc.,
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* Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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*/
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#ifndef _EXECMD_H_INCLUDED_
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#ifndef _EXECMD_H_INCLUDED_
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#define _EXECMD_H_INCLUDED_
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#define _EXECMD_H_INCLUDED_
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#include "autoconfig.h"
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#include <signal.h>
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#include <string>
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#include <string>
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#include <vector>
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#include <vector>
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#include <stack>
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#include <stack>
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#include "netcon.h"
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/**
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/**
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* Callback function object to advise of new data arrival, or just periodic
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* Callback function object to advise of new data arrival, or just periodic
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* heartbeat if cnt is 0.
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* heartbeat if cnt is 0.
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*
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*
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virtual void newData(int cnt) = 0;
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virtual void newData(int cnt) = 0;
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};
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};
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/**
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/**
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* Callback function object to get more input data. Data has to be provided
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* Callback function object to get more input data. Data has to be provided
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* in the initial input string, set it to empty to signify eof.
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* into the initial input string, set it to empty to signify eof.
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*/
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*/
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class ExecCmdProvide {
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class ExecCmdProvide {
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public:
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public:
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virtual ~ExecCmdProvide() {}
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virtual ~ExecCmdProvide() {}
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virtual void newData() = 0;
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virtual void newData() = 0;
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*/
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*/
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void setrlimit_as(int mbytes);
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void setrlimit_as(int mbytes);
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/**
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/**
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* Set function objects to call whenever new data is available or on
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* Set function objects to call whenever new data is available or on
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* select timeout / whenever new data is needed to send. Must be called
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* select timeout. The data itself is stored in the output string.
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* before doexec()
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* Must be set before calling doexec.
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*/
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*/
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void setAdvise(ExecCmdAdvise *adv) {m_advise = adv;}
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void setAdvise(ExecCmdAdvise *adv);
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/*
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* Set function object to call whenever new data is needed. The
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* data should be stored in the input string. Must be set before
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* calling doexec()
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*/
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void setProvide(ExecCmdProvide *p) {m_provide = p;}
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void setProvide(ExecCmdProvide *p);
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/**
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/**
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* Set select timeout in milliseconds. The default is 1 S.
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* Set select timeout in milliseconds. The default is 1 S.
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* This is NOT a time after which an error will occur, but the period of
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* This is NOT a time after which an error will occur, but the period of
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* the calls to the cancellation check routine.
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* the calls to the advise routine (which normally checks for cancellation).
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*/
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*/
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void setTimeout(int mS) {if (mS > 30) m_timeoutMs = mS;}
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void setTimeout(int mS);
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/**
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/**
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* Set destination for stderr data. The default is to let it alone (will
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* Set destination for stderr data. The default is to let it alone (will
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* usually go to the terminal or to wherever the desktop messages go).
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* usually go to the terminal or to wherever the desktop messages go).
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* There is currently no option to put stderr data into a program variable
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* There is currently no option to put stderr data into a program variable
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* If the parameter can't be opened for writing, the command's
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* If the parameter can't be opened for writing, the command's
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* stderr will be closed.
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* stderr will be closed.
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*/
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*/
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void setStderr(const std::string &stderrFile) {m_stderrFile = stderrFile;}
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void setStderr(const std::string &stderrFile);
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/**
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/**
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* Execute command.
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* Execute command.
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*
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*
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* Both input and output can be specified, and asynchronous
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* Both input and output can be specified, and asynchronous
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* @param cmd the program to execute. This must be an absolute file name
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* @param cmd the program to execute. This must be an absolute file name
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* or exist in the PATH.
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* or exist in the PATH.
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* @param args the argument vector (NOT including argv[0]).
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* @param args the argument vector (NOT including argv[0]).
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* @param input Input to send TO the command.
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* @param input Input to send TO the command.
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* @param output Output FROM the command.
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* @param output Output FROM the command.
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* @return the exec ouput status (0 if ok), or -1
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* @return the exec output status (0 if ok), or -1
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*/
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*/
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int doexec(const std::string &cmd, const std::vector<std::string>& args,
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int doexec(const std::string &cmd, const std::vector<std::string>& args,
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const std::string *input = 0,
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const std::string *input = 0,
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std::string *output = 0);
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std::string *output = 0);
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/** Wait with WNOHANG set.
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/** Wait with WNOHANG set.
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@return true if process exited, false else.
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@return true if process exited, false else.
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@param O: status, the wait(2) call's status value */
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@param O: status, the wait(2) call's status value */
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bool maybereap(int *status);
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bool maybereap(int *status);
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pid_t getChildPid() {return m_pid;}
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pid_t getChildPid();
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/**
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/**
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* Cancel/kill command. This can be called from another thread or
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* Cancel/kill command. This can be called from another thread or
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* from the advise callback, which could also raise an exception to
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* from the advise callback, which could also raise an exception to
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* accomplish the same thing
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* accomplish the same thing
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*/
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*/
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void setKill() {m_killRequest = true;}
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void setKill();
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/**
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/**
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* Get rid of current process (become ready for start).
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* Get rid of current process (become ready for start).
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*/
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*/
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void zapChild() {setKill(); (void)wait();}
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void zapChild();
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ExecCmd()
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ExecCmd();
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: m_advise(0), m_provide(0), m_timeoutMs(1000), m_rlimit_as_mbytes(0)
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{
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reset();
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}
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~ExecCmd();
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~ExecCmd();
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/**
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/**
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* Utility routine: check if/where a command is found according to the
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* Utility routine: check if/where a command is found according to the
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* current PATH (or the specified one
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* current PATH (or the specified one
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* @param out output: what the command printed
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* @param out output: what the command printed
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* @return true if exec status was 0
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* @return true if exec status was 0
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*/
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*/
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static bool backtick(const std::vector<std::string> cmd, std::string& out);
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static bool backtick(const std::vector<std::string> cmd, std::string& out);
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friend class ExecCmdRsrc;
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class Internal;
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private:
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private:
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static bool o_useVfork;
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Internal *m;
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std::vector<std::string> m_env;
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ExecCmdAdvise *m_advise;
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ExecCmdProvide *m_provide;
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bool m_killRequest;
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int m_timeoutMs;
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int m_rlimit_as_mbytes;
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std::string m_stderrFile;
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// Pipe for data going to the command
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int m_pipein[2];
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NetconP m_tocmd;
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// Pipe for data coming out
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int m_pipeout[2];
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NetconP m_fromcmd;
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// Subprocess id
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pid_t m_pid;
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// Saved sigmask
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sigset_t m_blkcld;
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// Reset internal state indicators. Any resources should have been
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// previously freed
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void reset() {
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m_killRequest = false;
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m_pipein[0] = m_pipein[1] = m_pipeout[0] = m_pipeout[1] = -1;
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m_pid = -1;
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sigemptyset(&m_blkcld);
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}
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// Child process code
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inline void dochild(const std::string &cmd, const char **argv,
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const char **envv, bool has_input, bool has_output);
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/* Copyconst and assignment private and forbidden */
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/* Copyconst and assignment are private and forbidden */
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ExecCmd(const ExecCmd &) {}
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ExecCmd(const ExecCmd &) {}
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ExecCmd& operator=(const ExecCmd &) {return *this;};
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ExecCmd& operator=(const ExecCmd &) {return *this;};
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};
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};
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