what will be the PID after fork()?

Question

I am doing 3 consecutive forks in a C program.
1. Is it going to execute in the same order ? ( My guess is yes ).
2. If I do a pgrep myexecutable from shell, would it give the process ids in the same order as they were started ? ( my guess is no, because you cant guarantee what pid the system gives the child, right ? )

Answer 1

There would be a total of 8 processes running after 3 forks are executed

so now the pid would be depend on which order the child process are created by and also in which order the children of children are created.

could be like

main - 12345

child1_of_main_after_fork1  12346

child2_of_child1_after_fork2  12347

child3_of_main_after_fork2 12348

child4_of_main_after_fork3 12349

child5_of_child1_after_fork3 12350

child6_of_child2_after_fork3 12351

child7_of_child3_after_fork3 12352