Redirecting To Dev Null C

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Redirecting To Dev Null Code

Redirecting To Dev Null C

Crontab Redirect To Dev Null

Redirecting function output to /dev/null. Ask Question Asked 8 years, 4 months ago. Active 5 years, 11 months ago. If you are sure that thing does not redirect output (e.g. To /dev/tty/, which would be standard-out again) (which I don't think), you could redirect before calling them. C - the - Redirecting function output to/dev/null redirect to dev null (2) I am using a library that is printing a warning message to cout or cerr.

Cron Redirect To Dev Null

Expert100+
Hi, all.
I am coding in C on Linux, and using an external library provided by others. This library generates a batch of error/warning messages to stdout, which I do not want to see.
Before each function call to the external library, I can insert the following:
  1. freopen('/dev/null', 'w', stdout);
However, after the function call I cannot figure out how to reroute stdout to the console.
I tried early in the program defining:
  1. FILE *fConsole = stdout;
and then following the function call with
  1. freopen(fConsole, 'w', stdout);
I also tried following the function call with
  1. freopen('CON', 'w', stdout);
Neither worked; all subsequent messages written to stdout continue to go to /dev/null; that is, they disappear.
So.. how do I get the stdout messages back to the console after my external function has executed?
Thanks!
Hi,
Try this idea.
1)Open a file in write mode
2)use dup system call to swap the file descriptor to stdout
3)Open a file in write mode
4)use dup system call to swap the file descriptor to stderr
5)call ur functions/library
6)restore the file descriptor back to stdout and stderr.
7)close the file
u have to use open call instead of fopen for this.
Hope this helps u
Raghuram

Script Dev Null

ITworld covers a wide range of technology topics, including software, security, operating systems, mobile, storage, servers and data centers, emerging tech, and technology companies such as. Sep 04, 2009  Hi, I'm facing a stupid problem. I have to work with a crappy C library which prints messages on screen using cout. I want to get rid of these messages, but I cannot modify the code (well, I could, but I cannot reinstall it so I have to live with the verbose library). STDERR redirects to THE ADDRESS of STDOUT (File descriptor 1 in that moment, or /proc/self/fd/1), and then STDOUT redirects to /dev/null, but STDERR keeps redirecting to fd1!! As a result the normal output from STDOUT is discarded, but the errors coming from STDERR are still being written onto the console. Ping -q -c 1 google.com /dev/null && echo online echo offline You are essentially only redirecting the output of Stream 1 (i.e. Stdout) to /dev/null. This is fine when you want to redirect the output that is produced by the normal execution of a program. C - the - Redirecting function output to/dev/null redirect to dev null (2) I am using a library that is printing a warning message to cout or cerr.

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