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Full Discussion: Function explanation
Top Forums UNIX for Beginners Questions & Answers Function explanation Post 303043530 by Chubler_XL on Thursday 30th of January 2020 04:47:52 PM
Old 01-30-2020
This function is quite well commented, it basically uses the tail command to print the last MAX_LENGTH ($2) lines of FILE ($1) these are stored in a temporary file (name generated by the mktmp command) the contents of this temporary file is then copied back over the original file and the temporary file removed.
All the operations performed are checked to ensure they have a success exit code before moving onto the next step.

Which particular part of the function you are having trouble understanding?
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explain_socketpair_or_die(3)				     Library Functions Manual				      explain_socketpair_or_die(3)

NAME
explain_socketpair_or_die - create pair of connected sockets and report errors SYNOPSIS
#include <libexplain/socketpair.h> void explain_socketpair_or_die(int domain, int type, int protocol, int *sv); int explain_socketpair_on_error(int domain, int type, int protocol, int *sv); DESCRIPTION
The explain_socketpair_or_die function is used to call the socketpair(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_socketpair(3) function, and then the process terminates by calling exit(EXIT_FAILURE). The explain_socketpair_on_error function is used to call the socketpair(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_socketpair(3) function, but still returns to the caller. domain The domain, exactly as to be passed to the socketpair(2) system call. type The type, exactly as to be passed to the socketpair(2) system call. protocol The protocol, exactly as to be passed to the socketpair(2) system call. sv The sv, exactly as to be passed to the socketpair(2) system call. RETURN VALUE
The explain_socketpair_or_die function only returns on success, see socketpair(2) for more information. On failure, prints an explanation and exits, it does not return. The explain_socketpair_on_error function always returns the value return by the wrapped socketpair(2) system call. EXAMPLE
The explain_socketpair_or_die function is intended to be used in a fashion similar to the following example: explain_socketpair_or_die(domain, type, protocol, sv); SEE ALSO
socketpair(2) create a pair of connected sockets explain_socketpair(3) explain socketpair(2) errors exit(2) terminate the calling process COPYRIGHT
libexplain version 0.52 Copyright (C) 2010 Peter Miller explain_socketpair_or_die(3)
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