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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LEARN ABOUT DEBIAN
explain_strtoull_or_die
explain_strtoull_or_die(3) Library Functions Manual explain_strtoull_or_die(3)
NAME
explain_strtoull_or_die - convert string to integer and report errors
SYNOPSIS
#include <libexplain/strtoull.h>
unsigned long long explain_strtoull_or_die(const char *nptr, char **endptr, int base);
unsigned long long explain_strtoull_on_error(const char *nptr, char **endptr, int base))
DESCRIPTION
The explain_strtoull_or_die function is used to call the strtoull(3) system call. On failure an explanation will be printed to stderr,
obtained from the explain_strtoull(3) function, and then the process terminates by calling exit(EXIT_FAILURE).
The explain_strtoull_on_error function is used to call the strtoull(3) system call. On failure an explanation will be printed to stderr,
obtained from the explain_strtoull(3) function, but still returns to the caller.
nptr The nptr, exactly as to be passed to the strtoull(3) system call.
endptr The endptr, exactly as to be passed to the strtoull(3) system call.
base The base, exactly as to be passed to the strtoull(3) system call.
RETURN VALUE
The explain_strtoull_or_die function only returns on success, see strtoull(3) for more information. On failure, prints an explanation and
exits, it does not return.
The explain_strtoull_on_error function always returns the value return by the wrapped strtoull(3) system call.
EXAMPLE
The explain_strtoull_or_die function is intended to be used in a fashion similar to the following example:
unsigned long long result = explain_strtoull_or_die(nptr, endptr, base);
SEE ALSO
strtoull(3)
convert a string to an unsigned long integer
explain_strtoull(3)
explain strtoull(3) errors
exit(2) terminate the calling process
COPYRIGHT
libexplain version 0.52
Copyright (C) 2009 Peter Miller
explain_strtoull_or_die(3)