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Man Pages
explain_dup_or_die(3) FreeBSD Library Functions Manual explain_dup_or_die(3)

explain_dup_or_die - duplicate a file descriptor and report errors

#include <libexplain/dup.h>
void explain_dup_or_die(int fildes);

The explain_dup_or_die function is used to call the dup(2) system call. On failure an explanation will be printed to stderr, obtained from explain_dup(3), and then the process terminates by calling exit(EXIT_FAILURE).
This function is intended to be used in a fashion similar to the following example:
explain_dup_or_die(fildes);
fildes
The fildes, exactly as to be passed to the dup(2) system call.
Returns:
This function only returns on success. On failure, prints an explanation and exits.

dup(2)
duplicate a file descriptor
explain_dup(3)
explain dup(2) errors
exit(2)
terminate the calling process

libexplain version 1.3
 
Copyright (C) 2008 Peter Miller

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