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Not able to see the inputted command on the shell prompt..but its executing the comnd

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# 1  
Old 09-19-2006
Not able to see the inputted command on the shell prompt..but its executing the comnd
Hi ,
I m writing a program which involves piping(pipes).

In my program, once i execute the child process (dealing with pipe),I m not able to see any inputted command on the screen....but the entered command is getting executed...

Actaully inorder to implement piping i hav closed STDIN and STDOUT in the child but according to me it should only last for child process,once execvp() is executed in the child process everthng shuold be restored...rite!!!

Inspite of this, i tried to flush everythng once the child processs terminate.

Still i m not able to see the inputted command.. Smilie


Pls reply fast its bit urgent
# 2  
Old 09-19-2006
I thnk you mean fork(). execvp() does not return, the parent is replaced by the child.
# 3  
Old 09-19-2006
nopes man!!!
control goes to parent process (after execvp() in the child process)...but in parent process when i m trying to input anythng ...its not getting displyed on the STDOUT but that command is getting executed.

for example

myshel$ ls|more
a.h
b.h
c.c
d.d so on....

myshel$ clear

Here, after child executes ls|more , the reuslt is displayed on the output screen but thereafter i m not able to see whatever i type on the shell...for exampl here i m not able to see clear command(its in bold)...but its executing the clear command Smilie
# 4  
Old 09-20-2006
Maybe I don't understand what you're doing, but exec function do clobber the calling process - from the man page:

Code:
SYNOPSIS 
#include <unistd.h> 
extern char **environ; 

int execl(const char *path, const char *arg, ...); 
int execlp(const char *file, const char *arg, ...); 
int execle(const char *path, const char *arg , ..., char * const envp[]); 
int execv(const char *path, char *const argv[]); 
int execvp(const char *file, char *const argv[]); 

DESCRIPTION 
The exec() family of functions replaces the current process image with a new process image. 
The functions described in this manual page are front-ends for the function execve(2). 
(See the manual page for execve() for detailed information about the replacement of the current process.)

Post your code
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