09-24-2008
It's not clear (to me) what you are trying to do here: why can you not use fflush to flush a buffer?
Some immediate observations, though:
getchar returns EOF if nothing is read, rather than a NULL pointer, so don't compare its return value to NULL.
Writing to stdin is unlikely to succeed -- check the return value of fputc.
10 More Discussions You Might Find Interesting
1. Programming
Hi,
Program A: uses pipe()
I am able to read the stdout of PROGAM B (stdout got through system() command) into PROGRAM A using:
* child
-> dup2(fd, STDOUT_FILENO);
-> execl("/path/PROGRAM B", "PROGRAM B", NULL);
* parent
-> char line;
-> read(fd, line, 100);
Question:... (2 Replies)
Discussion started by: vvaidyan
2 Replies
2. Shell Programming and Scripting
Hi everyone, first post here.
Anyone who isn't interested in the background, press pagedown :).
I sometimes need to make scripts for little things I need in the infrastructure at the company I work at. Currently I am trying to make a wrapper script for a proprietary image-deployment program.... (2 Replies)
Discussion started by: andreas.ericson
2 Replies
3. UNIX for Dummies Questions & Answers
Hi,
i know how to
a) redirect stdout and stderr to one file,
b) and write to two files concurrently with same output using tee command
Now, i want to do both the above together.
I have a script and it should write both stdout and stderr in one file and also write the same content to... (8 Replies)
Discussion started by: ysrini
8 Replies
4. Shell Programming and Scripting
#!/bin/sh
exec 0</dev/null
exec 1>/dev/null
ls -l /proc/self/fd >&2 produces total 0
lr-x------ 1 tyler users 64 Feb 18 10:38 0 -> /proc/7886/fd
lrwx------ 1 tyler users 64 Feb 18 10:38 1 -> /dev/pts/4
lrwx------ 1 tyler users 64 Feb 18 10:38 2 -> /dev/pts/4 I've verified the shell is... (10 Replies)
Discussion started by: Corona688
10 Replies
5. Shell Programming and Scripting
Hi,
I am working on a project where I have to generate and execute nasm code on-the-fly. I generate the code in a file program.asm and then execute it.This output is to stdout which i redirect to an output file which i read back to compare results:
system("nasm -f elf program.asm >... (5 Replies)
Discussion started by: doc_cypher
5 Replies
6. Programming
All,
Ok...so I know I *should* be able to control a process's stdin and stdout from the parent by creating pipes and then dup'ing them in the child. And, this works with all "normal" programs that I've tried. Unfortunately, I want to intercept the stdin/out of the scp application and it seems... (9 Replies)
Discussion started by: DreamWarrior
9 Replies
7. Programming
Hi,
i am using the below program to read from the standard input or to write to standard out put.
i know that using highlevel functions this can be done better than what i have done here.
i just want to know is there any other method by which i find the exact number of characters ( this... (3 Replies)
Discussion started by: MrUser
3 Replies
8. UNIX for Dummies Questions & Answers
Hallo,
i have a script like:
if ;then
echo "OK"
else
echo "ERROR $2 is missing"
fi;
if ;then
touch $2
fi;
if ;then
cat $1 | grep xy > $2 (1 Reply)
Discussion started by: eightball
1 Replies
9. UNIX for Advanced & Expert Users
I want to differentiate the STDOUT and STDERR messages in my terminal .
If a script or command is printing a message in terminal I want to differentiate by colors,
Is it possible ?
Example:
$date
Wed Jul 27 12:36:50 IST 2011
$datee
bash: datee: command not found
$alias ls
alias... (2 Replies)
Discussion started by: ungalnanban
2 Replies
10. Shell Programming and Scripting
Well.. let's say i need to write a pretty simple script.
In my script i have 2 variables which can have value of 0 or 1.
$VERBOSE
$LOG
I need to implement these cases:
($VERBOSE = 0 && $LOG = 0) => ONLY ERROR output (STDERR to console && STDOUT to /dev/null)
($VERBOSE = 1... (5 Replies)
Discussion started by: Marmz
5 Replies
LEARN ABOUT DEBIAN
rarun2
RARUN2(1) BSD General Commands Manual RARUN2(1)
NAME
rarun2 -- radare2 utility to run programs in exotic environments
SYNOPSIS
rarun2 [[script.rr2]]
DESCRIPTION
This program is used as a launcher for running programs with different environment, arguments, permissions, directories and overridden
default filedescriptors.
The program just accepts a single argument which is the filename of the configuration file to run the program.
It is useful when you have to run a program using long arguments or pass long data to stdin or things like that usually required for exploit-
ing crackmes :)
DIRECTIVES
The rr2 (rarun2) configuration file accepts the following directives, described as key=value entries and comments defined as lines starting
with '#'.
program path to program to be executed
stdout select file to replace stdout file descriptor
stdin select file to read data from stdin
input set string to be passed to the program via stdin
chdir change directory before executing the program
chroot run the program in chroot. requires some previous setup
preload preload a library (not supported on Windows, only linux,osx,bsd)
setuid set process uid
seteuid set effective process uid
setgid set process group id
setegid set effective process group id
setenv set value for given environment variable
arg[0-3] set value for argument N passed to the program
EXAMPLE
$ cat foo.rr2
#!/usr/bin/rarun2
program=./pp400
arg0=10
stdin=foo.txt
chdir=/tmp
#chroot=.
./foo.rr2
SEE ALSO
radare2(1), rahash2(1), rafind2(1), rabin2(1), ranal2(1), radiff2(1), ragg2(1), rasm2(1),
AUTHORS
pancake <pancake@nopcode.org>
BSD
Oct 11, 2011 BSD