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Full Discussion: Step by step fork()
Top Forums UNIX for Dummies Questions & Answers Step by step fork() Post 302460889 by joker40 on Thursday 7th of October 2010 11:42:22 PM
Old 10-08-2010
forking problem

this was my first try with forking....
Code:
childid=0; 
for (i=1;i<3;i++)  
     if(childid=fork())      
            break;

fprintf("Print processid%d  parentid%d  childid%d" , getpid,getparent,child);

But when i split fprintf() one line each....such as......
Code:
.....
.....
fprintf("Print processid%d" , getpid());
fprintf("Print parentid%d",getparent());
fprintf("print child%d\n",child);

My output gets messed up and parentid of one process get mixed up on same line with childid of different process and sometimes doesn't even print processid.Does this have anything to do with fprintf() function which holds data for output in the buffer.My assumption is that sometimes while one process is lets say on first line of its printf() cpu takes away its time and then gives it to second process. Second process maybe gets to second line of printf() and now tis time is taken away. Now in the buffer we have 3 things that need to be printed out. Am i correct on what is happening here??
 

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