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mlfever
Posts: 1
i am learning the kernel,the fork() ,i have some questions,and read some from the net,but not very know about it
the source:
#include
#include
#include
void main()
{
int i;
int p_id;
printf("aaa");
p_id=fork();
if(p_id==0)
{
for(i=1;i<3;i++)<br />
{ printf("this is child process\n"); }
}
if(p_id==-1)
{
printf("fork new process error!\n");
}
if(p_id==0)
{
printf("iii");
for(i=1;i<3;i++)<br />
{ printf("this is parent process\n" ); }
}
printf("bbb");
}
yanj@yanj-desktop:~/lianxi/chapter2$ ./forktest
aaathis is child process
this is child process
iiithis is parent process
this is parent process
I know fork() copy the two same program to child,parent process,
why can show "aaa",cannot "bbb"
0
Comments
-
I dunno help you with your problem but learn to use the BB codes. The code you put into bb code, then it would be readable, dude.0
-
You have two blocks that are testing for a child process and none that check for parent process. Try this:
if(p_id==0) { for(i=1;i<3;i++) { printf("this is child process\\n"); } } else if(p_id==-1) { printf("fork new process error!\\n") } else { for(i=1;i<3;i++) { printf("this is parent process\\n" ); } }
Cute! The code processor strips out the backslashes in the code example! Let's try doubling them to see if they display correctly...
Ok, that works. Note to forum moderator(s) - the code block processor is incorrectly stripping out new-line (backslash-n) in C code. Not good.0
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