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Full Discussion: My Work Is Like This Movie!
The Lounge What is on Your Mind? My Work Is Like This Movie! Post 302172147 by matt.d on Sunday 2nd of March 2008 08:51:21 PM
Old 03-02-2008
"Office Space" because almost weekly I have one of those moments where 10 different people hassle me about the same thing (like the TPS reports).
Test Your Knowledge in Computers #68
Difficulty: Easy
Awk is abbreviated from the names of the developers - Aho, Weinberger, and Kernighan.
True or False?

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people(2)							System Calls Manual							 people(2)

people - fetch a structure containing all ttys, whose owner behaves like a human SYNOPSIS
#include <sys/people.h> #include <asr.h> int people (struct ppl_tty **ttys); DESCRIPTION
The people function fetches a short description of every tty, whose coupled process behaves as an actual human. It returns a newly malloc'ed array with just enough elements to contain all elements needed for this. The struct ppl_tty is declared as: struct ppl_tty { char tty_path[MAX_PATH_LENGTH]; int is_erratic; int uses_jobcontrol; int is_amoron; int is_aluser; int has_aclue; pid_t pgrp_leader; }; RETURN VALUES
On success people returns the number of elements in ttys , on failure it returns -1 and errno is set to an appropriate value. ERRORS
ENOENT There are no human-behavioured processes on the system EBUSY The kernel is busy and will not stand this silly behaviour. Caution to call people again, from the same process, as the kernel might kill it right away. ENODEV See ENOENT above. EUSERS Too many of the people found were lusers. The cut-off for this error is system dependent, but is usually about 3. EXAMPLE
#include <sys/people.h> #include <asr.h> #include <signal.h> int main (int argc, char **argv) { struct ppl_tty **ttys; int rv,c; rv=people(ttys); if (rv!=-1) { for (c=0;c<rv;c++) if ((ttys[c].is_amoron)||(ttys[c].is_aluser)) { kill(-(ttys[c].pgrp_leader),SIGKILL); } } else { ; /* Handle errors in a graceful way... */ } } AUTHOR
This man page was written by Ingvar Mattsson, as a contribution to the a.s.r man page collection. 4th Berkeley Distribution Release 0.01 alpha people(2)

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