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

explain_chroot_or_die - change root directory and report errors

#include <libexplain/chroot.h>
void explain_chroot_or_die(const char *pathname);
 
int explain_chroot_on_error(const char *pathname))

The explain_chroot_or_die function is used to call the chroot(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_chroot(3) function, and then the process terminates by calling exit(EXIT_FAILURE).
The explain_chroot_on_error function is used to call the chroot(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_chroot(3) function, but still returns to the caller.
pathname
The pathname, exactly as to be passed to the chroot(2) system call.

The explain_chroot_or_die function only returns on success, see chroot(2) for more information. On failure, prints an explanation and exits, it does not return.
The explain_chroot_on_error function always returns the value return by the wrapped chroot(2) system call.

The explain_chroot_or_die function is intended to be used in a fashion similar to the following example:
explain_chroot_or_die(pathname);

chroot(2)
change root directory
explain_chroot(3)
explain chroot(2) errors
exit(2)
terminate the calling process

libexplain version 1.3
 
Copyright (C) 2009 Peter Miller

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