EXECVP and Output redirection
Hasan Quadri
output of the command that is run by EXECVP into a character buffer rather than
to the screen. Ex. I want to execute 'ls', I want its output to go into a
array of characters.
I've tried the DUP system call, but I can't get what I want. I'd really
appreciate some help on this, thanks.
--
Hasan Quadri "Windows isn't a virus, a virus does something!"
qua...@remus.rutgers.edu
http://remus.rutgers.edu/~quadri/index.html
Demetri Mouratis
| I'm trying to use the EXECVP system call and what I'm trying to do is put the
| output of the command that is run by EXECVP into a character buffer rather
| than
| to the screen. Ex. I want to execute 'ls', I want its output to go into a
| array of characters.
| I've tried the DUP system call, but I can't get what I want. I'd really
| appreciate some help on this, thanks.
If you want to use a system call to do this use pipe(), if you want to
use *FILE constructs, use popen(). Basically, they fork a child and
give you a file descriptor that you can use to read the output of the
child (for example, into a character array)
--
Demetri S. Mouratis ds...@hobbit.ntrs.com
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Mischa Sandberg
(Demetri Mouratis) writes:
>
> If you want to use a system call to do this use pipe(), if you want to
> use *FILE constructs, use popen(). Basically, they fork a child and
> give you a file descriptor that you can use to read the output of the
> child (for example, into a character array)
Or, more explicitly:
char buf[999];
FILE *pp;
pp = popen("ls", "r");
if (pp == 0) exit(1);
while (fgets(buf, sizeof buf, pp) != 0) {
... do something with buf ...
}
pclose(pp);
--
Mischa Sandberg ... Mischa_...@mindlink.bc.ca
Engineers think equations approximate reality.
Physicists think reality approximates the equations.
Mathematicians never make the connection.