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System call fork() returns the child process ID to the parent and returns 0 to the child process. The following figure shows that in both address spaces there is a variable pid. The one in the parent receives the child's process ID 3456 and the one in the child receives 0.

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1. Fork 1.0.67 Fork Lake
2. 6' Forks For Forklift

The child that results from the second fork knows about the results of the first fork because it is an exact copy of the parent process. You can work out what happens by drawing a little tree for yourself. Start with the first fork: fork / / parent -/ - child1 The parent gets back the PID of the child1 process, and child1 gets back 0. So we have something like: PID(child1) && fork fork in the parent, and: 0 && fork fork in the child. Short circuiting means that the middle fork of the original expression doesn't get executed in the child, only in the parent. So now what happens to the tree?

Fork / / parent -/ - child1 fork / / parent -/ - child2 parent is the original process, and gets the PID of child2. Child2, just like child1, gets 0.

Fork 1.0.67 Fork Lake

What do our expressions look like now? Parent: PID(child1) && PID(child2) fork = 1 fork child: 0 fork child2: PID(child1) && 0 fork = 0 fork Now, again by short-circuiting, parent is done, and doesn't execute the last fork. Both child and child2 have to, however. That leaves us with the following tree: fork / / parent -/ - child1 fork fork / / / / / child1 -/ - child1-1 / / parent -/ - child2 fork / / child2 -/ - child2-1 And that's it. Child1 and child2 each get the PID of their respective children, and child1-1 and child2-1 each get back 0. Substituting those values in, the final expressions are: parent: 1 child1: 0 PID(child1-1) = 1 child2: 0 PID(child2-1) = 1 child1-1: 0 0 = 0 child2-1: 0 0 = 0 And that's it - they all exit.

@@ -25,7 +25,7 @@ extends =./component/zlib/buildout.cfg./component/stunnel/buildout.cfg./component/pycrypto-python/buildout.cfg./component/ mysql-python/buildout.cfg./component/ python-mysqlclient/buildout.cfg./stack/slapos.cfg eggs. @@ -39,10 +39,10 @@ keep-compile-dir = false versions # Generated automatically by buildout-versions MySQL-python = 1.2.3 apache-libcloud = 0.9.1 async = 0.6.1 gitdb = 0.5.4 mysqlclient = 1.3.7 plone.recipe.command = 1.1 slapos.recipe.template = 2.3 slapos.toolbox = 0.40.4. @@ -7,7 +7,7 @@ parts = apache-php mariadb mydumper mysql-python python-mysqlclient rdiff-backup dropbear eggs.

6' Forks For Forklift

@@ -40,7 +40,7 @@ extends =././component/lxml-python/buildout.cfg././component/mariadb/buildout.cfg././component/mydumper/buildout.cfg././component/ mysql-python/buildout.cfg././component/ python-mysqlclient/buildout.cfg././component/perl/buildout.cfg././component/rdiff-backup/buildout.cfg././component/sqlite3/buildout.cfg. @@ -181,10 +181,10 @@ eggs = slapos.toolboxlampconfigure versions MySQL-python = 1.2.4 apache-libcloud = 0.12.3 async = 0.6.1 gitdb = 0.5.4 mysqlclient = 1.3.7 pycrypto = 2.6 rdiff-backup = 1.0.5 slapos.recipe.template = 2.4.2.