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Bloomberg LP Interview Question for Financial Software Developers


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2
of 2 vote

@callbacker..If u know the answer can you please explain the sequence of steps in detail? That would be really helpful..

- KingKong.. June 25, 2010 | Flag Reply
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0
of 0 votes

sure.. here's the outline:
- Shell fork()'s and the child process exec()'s the image of the command (gcc in this case).
- The shell does not call wait() or waitpid(), because that would cause the command to run in foreground and shell prompt won't return until child is finished.
- So what shell does is install signal handler for SIGCHILD signal. When the child finishes, the kernel sends SIGCHILD signal to parent (the shell in this case), and shell calls the signal handler. In the signal handler, shell calls wait() or waitpid(), which reads the return value of the child process (so that child process does not become a zombie).
Voila!

- callbacker June 26, 2010 | Flag
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0
of 0 votes

Involves shell handling background process.
1. listing
2. when background process wants to access terminal, controlling through signals SIGTTOU, SIGTTIN

- AmitG November 12, 2010 | Flag
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0
of 0 vote

exec is called by gcc and the executable for foo.c is loaded by the loader. Ofcourse before this load happens, linking needs to happen as well. The executable may have dynamically linked libraries and the load sys calls need to be embedded in the final executable image.

- landyaBhai June 25, 2010 | Flag Reply
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0
of 0 vote

Thanks for that call backer..

- Kingkong July 01, 2010 | Flag Reply
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0
of 0 vote

if the child process exit()'s before the parent process while parent process doesn't call wait()/waitpid(), then child process is in the status of Zombie....

- beyondfalcon August 17, 2010 | Flag Reply


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