Answer Posted / narendrasairam immadi

When a process is in user space, its system calls are being
intercepted by the tracing thread. When it's in the kernel,
it's not under system call tracing. This is the distinction
between user mode and kernel mode.

The transition from user mode to kernel mode is done by the
tracing thread. When a process executes a system call or
receives a signal, the tracing thread forces the process to
run in the kernel if necessary and continues it without
system call tracing

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584

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615

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When i run a programm of orphan process. Instead of getting child's parent (ppid)=1 ..i get 1400 and it varies as per system. How can i findthe right soluion??? My pgm: #include # include int main() { int pid; pid=fork(); if(pid < 0) {exit(-1);} else if(pid==0) { printf("Child Process is Sleeping ..."); sleep(10); printf("Orphan Child's Parent ID : %u ",getppid()); } else { printf("Parent Process Completed ... %u ",getpid()); exit(0); } return 0; } Output:

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