04-08-2008
Tk you but...
Yes you are right is not a straight telnet is more something about writing a c program that sends shell commands and retrive the answer.
It's really hard to sync the input and the output from shell...
I worked around with the code and I figurated out that my problem was with:
execl("/bin/sh", "sh", "-c", command, NULL);
now I'm able to execute execl without open a new shell.
This command works well:
execl("/usr/bin/telnet", command, ip_add, port, NULL);
where telnet it's just an alias on this solaris...
I still have problem on sync the write and reading part of the pipes...
Tks alot,
ff
10 More Discussions You Might Find Interesting
1. Programming
i made a lot of processes. here is the code:
main()
{
printf("\nEnter K="); scanf("%d",&k);
printf("Enter L="); scanf("%d",&l);
printf("\nFather id=%d\n",getpid());
x=0;
makechild();
sleep(2);
return 1;
}
int makechild()
{
for(q=1;q<=k;q++)
{
if(f=fork())
{
... (5 Replies)
Discussion started by: bb666
5 Replies
2. UNIX for Dummies Questions & Answers
Hi there,
I try to use:
> find * | ls
but it just gave me one level of ' ls '. and it said:
> find * | ls
dir1 dir2 f1 f2 f3
Broken Pipe
>
what is broken pipe?
how can i fix it?
thks
Gusla (3 Replies)
Discussion started by: gusla
3 Replies
3. Shell Programming and Scripting
Somewhat long story:
I have a simple Perl CGI script that uses Expect to Telnet to a device and grab some data, and then spits it back to Perl for display on the Webpage.
This works for many devices I've tried, but one device just fails, it keeps rejecting the password on this device, only... (1 Reply)
Discussion started by: jondo
1 Replies
4. Shell Programming and Scripting
Hi, guys:
I am working on my shell using c. How can I use pipe to implement the following?
ls -l 1>> | grep hellp 1<< 2>> | less 2<<
(the output of ls goes to grep, and the output of grep goes to less)
Thanks
Please use and tags when posting code, data or logs etc. to preserve... (1 Reply)
Discussion started by: tomlee
1 Replies
5. Shell Programming and Scripting
Hi All ,
Is there any way to replace the pipe ( | ) with the broken pipe (0xA6) in unix (1 Reply)
Discussion started by: saj
1 Replies
6. UNIX for Dummies Questions & Answers
Hi,
I was writing one script which includes to switch to the another telnet automatically from the present telnet server. I was using rlogin but firstly it takes the same user name of the present telnet and secondly it is prompting for the password.
But i want to switch to the another telnet... (2 Replies)
Discussion started by: Prateek
2 Replies
7. UNIX for Dummies Questions & Answers
I have been using unix on and off for a number of years. I am not a sys admin. I use what I need. I have googled this, but I really can't figure out what is the difference between using xarg and just using a regular pipe? Why do I need to include xarg sometimes and how do I know when I need it? (2 Replies)
Discussion started by: guessingo
2 Replies
8. UNIX for Dummies Questions & Answers
I can use pipe output to a file. For example
./somescript.sh > output.txt
But for example if the output from ./somescript.sh is slow. like if it prints one line every minute then output.txt is not updated every minute. Lines are written to output.txt in one go, hence have to wait for the whole... (2 Replies)
Discussion started by: kevincobain2000
2 Replies
9. UNIX for Dummies Questions & Answers
Hi,
I want to know the difference between these two services. Both are under xinetd. Both are used for enabling and disabling Telnet service. So, can somebody please explain me the difference between the two ?
Thanks in advance :) (0 Replies)
Discussion started by: kashifsd17
0 Replies
10. Shell Programming and Scripting
Hi guys,
I need to know how i can ignore Pipe '|' if Pipe is coming as a column in Pipe delimited file
for eg:
file 1:
xx|yy|"xyz|zzz"|zzz|12...
using below awk command
awk 'BEGIN {FS=OFS="|" } print $3
i would get xyz
But i want as :
xyz|zzz to consider as whole column... (13 Replies)
Discussion started by: rohit_shinez
13 Replies
EXECL(3) Library Functions Manual EXECL(3)
NAME
execl, execv, execle, execlp, execvp, exec, execve, exect, environ - execute a file
SYNOPSIS
execl(name, arg0, arg1, ..., argn, 0)
char *name, *arg0, *arg1, ..., *argn;
execv(name, argv)
char *name, *argv[];
execle(name, arg0, arg1, ..., argn, 0, envp)
char *name, *arg0, *arg1, ..., *argn, *envp[];
exect(name, argv, envp)
char *name, *argv[], *envp[];
extern char **environ;
DESCRIPTION
These routines provide various interfaces to the execve system call. Refer to execve(2) for a description of their properties; only brief
descriptions are provided here.
Exec in all its forms overlays the calling process with the named file, then transfers to the entry point of the core image of the file.
There can be no return from a successful exec; the calling core image is lost.
The name argument is a pointer to the name of the file to be executed. The pointers arg[0], arg[1] ... address null-terminated strings.
Conventionally arg[0] is the name of the file.
Two interfaces are available. execl is useful when a known file with known arguments is being called; the arguments to execl are the char-
acter strings constituting the file and the arguments; the first argument is conventionally the same as the file name (or its last compo-
nent). A 0 argument must end the argument list.
The execv version is useful when the number of arguments is unknown in advance; the arguments to execv are the name of the file to be exe-
cuted and a vector of strings containing the arguments. The last argument string must be followed by a 0 pointer.
The exect version is used when the executed file is to be manipulated with ptrace(2). The program is forced to single step a single
instruction giving the parent an opportunity to manipulate its state. On the VAX-11 this is done by setting the trace bit in the process
status longword. Exect is not available on the PDP-11.
When a C program is executed, it is called as follows:
main(argc, argv, envp)
int argc;
char **argv, **envp;
where argc is the argument count and argv is an array of character pointers to the arguments themselves. As indicated, argc is convention-
ally at least one and the first member of the array points to a string containing the name of the file.
Argv is directly usable in another execv because argv[argc] is 0.
Envp is a pointer to an array of strings that constitute the environment of the process. Each string consists of a name, an "=", and a
null-terminated value. The array of pointers is terminated by a null pointer. The shell sh(1) passes an environment entry for each global
shell variable defined when the program is called. See environ(7) for some conventionally used names. The C run-time start-off routine
places a copy of envp in the global cell environ, which is used by execv and execl to pass the environment to any subprograms executed by
the current program.
Execlp and execvp are called with the same arguments as execl and execv, but duplicate the shell's actions in searching for an executable
file in a list of directories. The directory list is obtained from the environment.
FILES
/bin/sh shell, invoked if command file found by execlp or execvp
SEE ALSO
execve(2), fork(2), environ(7), csh(1)
DIAGNOSTICS
If the file cannot be found, if it is not executable, if it does not start with a valid magic number (see a.out(5)), if maximum memory is
exceeded, or if the arguments require too much space, a return constitutes the diagnostic; the return value is -1. Even for the super-
user, at least one of the execute-permission bits must be set for a file to be executed.
BUGS
If execvp is called to execute a file that turns out to be a shell command file, and if it is impossible to execute the shell, the values
of argv[0] and argv[-1] will be modified before return.
4.2 Berkeley Distribution August 4, 1987 EXECL(3)