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Using C language to use system calls

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Homework and Emergencies Homework & Coursework Questions Using C language to use system calls
# 8  
Old 11-22-2012
Quote:
Originally Posted by femchi
Code:
execl("/usr/bin/find","find . -maxdepth 1 -perm 644",(char *)NULL);

it doesnt work properly. do you know what is the problem?
Like they said, it's not a shell, it doesn't split for you.

Also, if it did work, your program would immediately quit, because execl doesn't launch a new program -- it replaces your current program. If you want to create a new process, you have to fork first, then exec. Watch the return value of fork carefully. It creates a clone of your process, and its return value is the only thing which tells them which is which. You have to make sure your child process only does what the child should be doing and not anything else, make sure it quits if exec doesn't work and such.
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LEARN ABOUT MOJAVE

glutmenustatusfunc

glutMenuStatusFunc(3GLUT)					       GLUT						 glutMenuStatusFunc(3GLUT)

NAME

       glutMenuStatusFunc - sets the global menu status callback.

SYNTAX

       #include <GLUT/glut.h>

       void glutMenuStatusFunc(void (*func)(int status, int x, int y));
       void glutMenuStateFunc(void (*func)(int status));

ARGUMENTS

       func	 The new menu status (or state) callback function.

DESCRIPTION

       glutMenuStatusFunc  sets  the  global menu status callback so a GLUT program can determine when a menu is in use or not. When a menu status
       callback is registered, it will be called with the value GLUT_MENU_IN_USE for its value parameter when pop-up menus are in use by the user;
       and  the callback will be called with the value GLUT_MENU_NOT_IN_USE for its status parameter when pop-up menus are no longer in use. The x
       and y parameters indicate the location in window coordinates of the button press that caused the menu to go into use, or the location where
       the  menu  was  released  (may  be outside the window). The func parameter names the callback function. Other callbacks continue to operate
       (except mouse motion callbacks) when pop-up menus are in use so the menu status callback allows a program to  suspend  animation  or  other
       tasks  when menus are in use. The cascading and unmapping of sub-menus from an initial pop-up menu does not generate menu status callbacks.
       There is a single menu status callback for GLUT.

       When the menu status callback is called, the current menu will be set  to  the  initial	pop-up	menu  in  both	the  GLUT_MENU_IN_USE  and
       GLUT_MENU_NOT_IN_USE  cases.  The  current  window  will  be set to the window from which the initial menu was popped up from, also in both
       cases.

       Passing NULL to glutMenuStatusFunc disables the generation of the menu status callback.

       glutMenuStateFunc is a deprecated version of the glutMenuStatusFunc routine. The only difference is  glutMenuStateFunc  callback  prototype
       does not deliver the two additional x and y coordinates.

SEE ALSO

       glutCreateMenu, glutCreateWindow

AUTHOR

       Mark J. Kilgard (mjk@nvidia.com)

GLUT
									3.7						 glutMenuStatusFunc(3GLUT)