June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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Terminating a process
A process may be stopped voluntarily by calling the exit(3) function or, involuntarily, by receiving a signal that is not handled. One signal, in particular, SIGKILL, cannot be handled and so will always kill a process. In all cases, terminating the process will stop all threads, close all file descriptors, and release all memory. The system sends a signal, SIGCHLD, to the parent so that it knows this has happened.
Processes have a return value that is composed of either the argument to exit, if it terminated normally, or the signal number if it was killed. The chief use for this is in shell scripts: it allows you to test the return value from a program. By convention, 0 indicates success and other values indicate a ...
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