For windows was pretty simple to redirect the std in a and out of a
child process for "cmd.exe " command prompt terminal to a socket using connected pipes passed to a new process in the STARTUPINFO structure.
In above code the context (current directory) of the terminal cmd.exe is not lost between connections, and I can run internal shell commands as start, call, cd, and so on ....
For Linux I've tried to mimic the shell using popen(), and to write and read in the handler returned by popen(), but I cannot run /bash shell commands as cd, cp, mkdir and so on because they are internal bin/bash commands. I would like to have a shell up, and to write and read from it trough it's stdin stdout, available in my app (pipes of file handlers).
Something like:
Code:
//handles only 1 connection
execl_and_get_sddin_and_out("bin/bash"); // keep it up
...
while(1)
{
if(sock >0)
{
if(receive(socket, buffer))
fwrite(shell_stdin,..)
if(fread(she__stdout))
send(socket);
}
else
{
sock = wait_4_connection(); //accept and listen
}
}
I tried these samples (but they don;t hold the shell up, and the command is sent to a shell, then the shell is closed):
Sorry, why are you creating a socket connection? Why don't you use pipe the output of the command back to the user?
Quote:
For Linux I've tried to mimic the shell using popen(), and to write and read in the handler returned by popen(), but I cannot run /bash shell commands as cd, cp, mkdir and so on because they are internal bin/bash commands
Hunh? If you use popen, the only limitation is that you cannot both read from and write into the file descriptor. Only if that limitation is a problem do you need sockets. But you say you can't run them because they are "internal commands". But there almost always external versions of these commands available. (For cd, however, it's useless -- you must do this within the context of your program, or prefix all subsequent commands with a "cd".) Regardless, all one needs to do in this case is run bash and provide it the command to parse.
Hi there,
I need to execute a command in the bash. The program prints some standard (output and) error and then wants the user to choose one of several options and type the according input. I am trying to solve this issue in a bash script but also running into some circular dependency. How can I... (7 Replies)
Looking for the proper way to bring a string into the stdin. I have a string that I would like to grep and awk. Each have to be run separately, not piped together. So far, the only way I could figure out how is to echo the string and pipe it:
echo 'This is my string' | grep my (3 Replies)
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)
I am unable to use STDIn redirection with < (commands)
When I do the following, both approaches work and give the same results:
1.
$ printf "aaa\nbbb\n" > file1
$ printf "111\n222\n" > file2
$ cat file1 file2
aaa
bbb
111
2222.
$ cat <(printf "aaa\nbbb\n") <(printf "111\n222\n")
aaa... (8 Replies)
Hi:
I have the next script on ksh
#!/usr/bin/ksh
cd $FUENTES
qdesign <<-!
\$/opt/cognos/ph843e/bin/qtp <<-!
\$/opt/cognos/ph843e/bin/quiz <<-!
!
!
!
This script is very simple, i want to nest three process quiz into qtp, and this into qdesign.
When I run it , i receive the next... (2 Replies)
Hi:
I have the next script on ksh
#!/usr/bin/ksh
cd $FUENTES
qdesign <<-!
\$/opt/cognos/ph843e/bin/qtp <<-!
\$/opt/cognos/ph843e/bin/quiz <<-!
!
!
!
This script is very simple, i want to nest three process quiz into qtp, and this into qdesign.
When I run it , i receive the... (5 Replies)
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:
---------... (3 Replies)
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:
---------... (1 Reply)
can you redirect STDIN with command arguments?
I have tried this approach:
# ./script -option <argument1> <argument2> 0<$2
# $2: ambiguous redirect
Is this possible? (4 Replies)
My supervisor keep getting "stdin not tty" or something like that when he pipe or redirect input into a program. Others
don't seem to get this message. Is there some way I can help him to fix or turn this off?
Thx in advance (1 Reply)
