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Full Discussion: Timed action after fork() in parent process
Top Forums Programming Timed action after fork() in parent process Post 302510851 by JohnGraham on Tuesday 5th of April 2011 06:56:43 AM
Old 04-05-2011
Quote:
Originally Posted by disaster
My intention is to make one program available only over one call within another program.
Ah, sounds like what you're best off doing is creating a new group (e.g. 'proggrp') and making the calling program be owned by proggrp and setgid, and then making the called program owned by proggrp with the executable bit set only for the group. That way the user won't be able to chmod it (unless they own it - best make it owned by root, or use this scheme with a special user and setuid instead) and there will be no "gap" during which they can exploit the program's "executableness".

Edit: Also, by doing it this way you give control over who can run what to the system administrator (where it should be) as opposed to the programmer (who might not anticipate a need for more flexibility somewhere down the line...).
 

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LEARN ABOUT REDHAT

fork

FORK(2) 						     Linux Programmer's Manual							   FORK(2)

NAME

       fork - create a child process

SYNOPSIS

       #include <sys/types.h>
       #include <unistd.h>

       pid_t fork(void);

DESCRIPTION

       fork  creates a child process that differs from the parent process only in its PID and PPID, and in the fact that resource utilizations are
       set to 0.  File locks and pending signals are not inherited.

       Under Linux, fork is implemented using copy-on-write pages, so the only penalty incurred by fork is the time and memory required to  dupli-
       cate the parent's page tables, and to create a unique task structure for the child.

RETURN VALUE

       On success, the PID of the child process is returned in the parent's thread of execution, and a 0 is returned in the child's thread of exe-
       cution.	On failure, a -1 will be returned in the parent's context, no child process will be created, and errno will be set appropriately.

ERRORS

       EAGAIN fork cannot allocate sufficient memory to copy the parent's page tables and allocate a task structure for the child.

       ENOMEM fork failed to allocate the necessary kernel structures because memory is tight.

CONFORMING TO

       The fork call conforms to SVr4, SVID, POSIX, X/OPEN, BSD 4.3.

SEE ALSO

       clone(2), execve(2), vfork(2), wait(2)

Linux 1.2.9							    1995-06-10								   FORK(2)
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