| sub-categories and articles |
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 common |
common includes for compiling samples in subdirs here like threads
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| critical_section |
add
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| errors |
add
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| exec |
add
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| filedes |
file descriptors and their manipulation under unix
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| fork |
fork and wait
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| ipc |
shared memory, semaphores, message queues
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| libghttp |
libghttp and ncurses
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| linefeeder |
how to read a newline delimited file into memory and parse that in-memory file for memory
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| ncurses |
add
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| pipes |
named, unnamed pipes, and a token ring example
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| select |
select syntax unblocking IO
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| signals |
add
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| socket_libs |
two networking libraries: networkinglib.c and uici libraries
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| socketsipv4 |
the standard unix sockets lib
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| threads |
POSIX pthreads samples, sample code
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| time |
add
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| unbufferedIO |
unix IO file descriptors as args unbuffered
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| usp_book |
unix systems programming book source code
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--->create new sub-category
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 boundedbuffer.txt |
add
sem/boundedbuffer
threads/boundedbuffer
sem/sem.txt
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checklocale.c |
add
#include <stdio.h>
checklocale2.c |
add
#include <stdio.h>
connection_communicationtwo.txt |
add
chapter 18 USP
==============
this operating systems course is only concerned with the theories not with the code in this section
0. client-server introduction
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environ.c |
add
/* http://vip.cs.utsa.edu/usp/ dr.robbins utsa computer science "unix systems programming" */
getenv.c |
char * getenv("CAP_THING")
if (port <= 0) {
gettext.c |
add
// postgresql-7.4.1/src/backend/postmaster/postmaster.c
ipc.txt |
add
process synchronization
=======================
read sgz book chapter 7
process synchronization: getting processes to work together in a coordinated way.
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linux_c_lib.htm |
add
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mask_log.c |
demonstrate openlog() and family
/*
ncurses.htm |
add
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networkinglib.c |
http://www.complete.org/publications/lpb/downloads/lpb-examples
/* try socket_libs/networkinglibs.c */
int main() {
printf("goto http://www.sirfsup.com/languages/c/unix_c/socket_libs/networkinglibs.c");
processes.txt |
add
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seteuid.c |
seteuid
/*
setpgid.txt |
setpgid
1. Why do you have to call setpgid() when a process is supposed to run in the background?
When you create a process, it by default is created in a process group from which it was created ... When you run a command from the shell, the new process is created in that group ... and this group has a controlling tty ... obviously for backgrounding a process you need to disassociate from the controlling tty .... thus need for changing the process group
You create a separate group for the current process in which it will be the only process ... If setpgid creates groups if they do not exist, it will work like a charm
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size_t.txt |
how big is size_t and ssize_t difference size_t and ssize_t
size_t and ssize_t
==================
size_t must be unsigned as defined in the ANSI, POSIX, and Single UNIX standards. A signed version ssize_t is defined in POSIX and Single UNIX.
The underlying definition of size_t is in stddef.h which is part of the compiler. A small test case on my Linux 6.2 using gcc version 2.95.2 gives the following in the -E output:
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threads.htm |
add
try here
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unix_types.htm |
add
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