FBB::Exec(3bobcat)
Executing Child Processes
(libbobcat-dev_4.08.03-x.tar.gz)
2005-2018
NAME
FBB::Exec - Runs external programs
SYNOPSIS
#include <bobcat/exec>
Linking option: -lbobcat
DESCRIPTION
The FBB::Exec class offers a basic interface for calling external
programs (so-called child processes). The standard streams of the child
processes are not handled by ttExec) objects. The PATH environment
variable is not used when calling child processes: child process programs must
be specified using paths.
Exec objects may repeatedly be used to execute the same or different
child processes. Before starting the next child process, the current child
process must have finished.
Arguments passed to child processes may be surrounded by double or single
quotes. Arguments surrounded by double quotes have their double quotes
removed, while interpreting any escape-sequences that may have been used
within. Arguments surrounded by single quotes have their single quotes
removed, while accepting their contents as-is. In addition unquoted
escape-sequences may be specified: those escape sequences are evaluated and
replaced by their intended characters (e.g., \100 is converted to @).
NAMESPACE
FBB
All constructors, members, operators and manipulators, mentioned in this
man-page, are defined in the namespace FBB.
INHERITS FROM
FBB::Fork
CONSTRUCTOR
Only the default constructor is supported.
MEMBERS
- bool execute(std::string const &cmd):
The argument specifies the command to execute: the command itself must
be specified as a path (the PATH environment variable isn't used). The
member returns true if the child process's exit value equals 0. Otherwise
false is returned. Once execute has returned it can be called again,
either using the same or another command. The class Exec does not offer
facilities to forcefully terminate child processes: parent processes are
suspended until the child processes have completed. Arguments passed to the
program to be executed as child process may optionall be specified using
single or double quotes, as described in this man-page's DESCRIPTION section.
- int ret() const:
Once execute has returned this member provides the actual exit
code of the child process. Its value equals -1 before the first exectue
call.
EXAMPLE
#include <iostream>
#include <bobcat/execfork>
using namespace std;
using namespace FBB;
int main()
{
ExecFork ef;
if (ef.execute("/bin/cp driver.cc /tmp"))
cout << "driver.cc now copied to /tmp\n";
else
cout << "could not copy driver.cc to /tmp\n";
cout << "Again:\n";
if (ef.execute("/bin/cp driver.cc /tmp"))
cout << "driver.cc now copied to /tmp\n";
else
cout << "could not copy driver.cc to /tmp\n";
}
FILES
bobcat/exec - provides the class interface
SEE ALSO
bobcat(7), cerrextractor(3bobcat), cininserter(3bobcat),
coutextractor(3bobcat), execl(3), fork(3bobcat),
process(3bobcat), stdextractor(3bobcat).
BUGS
None reported.
DISTRIBUTION FILES
- bobcat_4.08.03-x.dsc: detached signature;
- bobcat_4.08.03-x.tar.gz: source archive;
- bobcat_4.08.03-x_i386.changes: change log;
- libbobcat1_4.08.03-x_*.deb: debian package holding the
libraries;
- libbobcat1-dev_4.08.03-x_*.deb: debian package holding the
libraries, headers and manual pages;
- http://sourceforge.net/projects/bobcat: public archive location;
BOBCAT
Bobcat is an acronym of `Brokken's Own Base Classes And Templates'.
COPYRIGHT
This is free software, distributed under the terms of the
GNU General Public License (GPL).
AUTHOR
Frank B. Brokken (f.b.brokken@rug.nl).