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Start programs in Linux

Started by Zoot Oct 10, 2002 at 2:22 PM 3 replies 850+ views

Original Post

Oct 10, 2002 at 2:22 PM

I am writing a menu program for linux... you can select programs form the menu and everything like that but how do a run a new program? or exec a shell command in c++? I am using g++ with kernal 2.4.19. / Zoot

necromancer_df

Oct 10, 2002 at 2:28 PM

you need to use the spawn fucntions. try looking at the man page for spawn.

Zoot

Author

Zoot

Oct 10, 2002 at 2:30 PM

"No manual entry for spawn"

Null and Void

163

Null and Void

Oct 10, 2002 at 4:24 PM

Try ''man exec'':


NAME
       execl, execlp, execle, execv, execvp - execute a file

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.)

       ...

You can use them with fork to avoid overwriting your current process. You can use ''system'' too, but I suggest that you don''t if you can avoid it.

necromancer_df

Oct 10, 2002 at 5:35 PM

quote:
Original post by Zoot
"No manual entry for spawn"

yeah sorry about that, i just realised

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