DOKK / manpages / debian 10 / libcommoncpp2-doc / ost_Process.3.en
ost::Process(3) Library Functions Manual ost::Process(3)

ost::Process - A class for containing portable process related functions that help create portable code.

#include <process.h>


typedef RETSIGTYPE(* Trap) (int)


bool lock (bool future=true)
Lock a process in memory. void unlock (void)
Unlock process pages.


static void detach (void)
Detach current process into a daemon, posix only. static void attach (const char *devname)
Attach the current process to another device or i/o session. static Trap setPosixSignal (int signo, Trap handler)
Set a posix compliant signal handler. static Trap setInterruptSignal (int signo, Trap handler)
Set system call interuptable signal handler. static int spawn (const char *exec, const char **argv, bool wait=true)
Spawn a process and wait for it's exit code. static int join (int pid)
Get the exit status of another process, waiting for it to exit. static bool cancel (int pid, int sig=0)
Cancel a running child process. static const char * getEnv (const char *name)
Get system environment. static void setEnv (const char *name, const char *value, bool overwrite)
Set system environment in a standard manner. static const char * getConfigDir (void)
Get etc prefix path. static const char * getHomeDir (void)
Get home directory. static const char * getUser (void)
Get user name. static bool setUser (const char *id, bool grp=true)
Set user id by name. static bool setGroup (const char *id)
Set the effective group id by name. static size_t getPageSize (void)
Return the effective operating system page size. static void setPriority (int pri)
Used to set process priority and optionally enable realtime. static void setScheduler (const char *policy)
Used to set process scheduling policy. static void setRealtime (int pri=0)
Portable shortcut for setting realtime... static bool isScheduler (void)
Return true if scheduler settable. static bool isRealtime (void)
Return true if realtime scheduling.

A class for containing portable process related functions that help create portable code.

These are typically referenced thru Process::xxx static member functions. Many of these members are used both for win32 and posix systems although some may be platform specific.

Peocess wrapper class.

Author:

David Sugar dyfet@ostel.com

Attach the current process to another device or i/o session. It is deamonified and dissasociated with the prior parent process and controlling terminal.

Parameters:

devname path to attach to.

Cancel a running child process.

Returns:

0 on success.

Parameters:

pid process id.
sig cancel signal to apply.

Detach current process into a daemon, posix only. Perhaps a similar method can be used for creating win32 'services'?

Get etc prefix path.

Returns:

etc prefix.

Get system environment.

Returns:

system environ symbol.

Parameters:

name of symbol.

Get home directory.

Returns:

user home directory.

Return the effective operating system page size.

Returns:

system page size.

Get user name.

Returns:

user login id.

Return true if realtime scheduling.

Return true if scheduler settable.

Get the exit status of another process, waiting for it to exit.

Returns:

exit code from process.

Parameters:

pid process id.

Lock a process in memory. Ideally you should be deep enough where additional memallocs for functions will not kill you, or use false for future.

Returns:

true if successful.

Parameters:

future pages as well...

Set system environment in a standard manner.

Parameters:

name of environment symbol to set.
value of environment symbol.
overwrite true if replace existing symbol.

Set the effective group id by name.

Returns:

true if successful.

static Trap ost::Process::setInterruptSignal (int signo, Trap handler) [static]

Set system call interuptable signal handler. #return previous handler.

Parameters:

signo signal no.
handler trap handler.

static Trap ost::Process::setPosixSignal (int signo, Trap handler) [static]

Set a posix compliant signal handler.

Returns:

previous handler.

Parameters:

signo signal no.
handler trap handler.

Used to set process priority and optionally enable realtime.

Portable shortcut for setting realtime...

Used to set process scheduling policy.

Set user id by name.

Returns:

true if successful.

Spawn a process and wait for it's exit code. In win32 this is done with the spawn system call. In posix, this is done with a fork, an execvp, and a waitpid.

Warning:

The implementation differences between posix and win32 systems may cause side effects. For instance, if you use atexit() and this spawn method, on posix systems the function set up with atexit() will be called when the parent process of the fork exits, which will not happen on Win32 systems.

Returns:

error code from process.

Parameters:

exec name of executable.
argv list of command arguments.
wait for process to exit before return.

Unlock process pages.

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Wed Oct 31 2018 GNU CommonC++