As I wrote in last week’s Lesson, the system() function can’t be used in Linux to obtain a program’s return value. Instead, you must use one of the execl() family of functions. Further, this function must be spawned as a child process. This task involves using the fork() and wait() functions.
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At the end of the main() function, a return statement must surrender an integer value to the operating system. Does a higher value please the OS? Is it offended by zero? What exactly happens with the value returned when your program is done?
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