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| explain_flock_or_die(3) | FreeBSD Library Functions Manual | explain_flock_or_die(3) |
NAME
explain_flock_or_die - control advisory lock on open file and report errorsSYNOPSIS
#include <libexplain/flock.h>void explain_flock_or_die(int fildes, int command);
int explain_flock_on_error(int fildes, int command))
DESCRIPTION
The explain_flock_or_die function is used to call the flock(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_flock(3) function, and then the process terminates by calling exit(EXIT_FAILURE).The explain_flock_on_error function is used to call the flock(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_flock(3) function, but still returns to the caller.
- fildes
- The fildes, exactly as to be passed to the flock(2) system call.
- command
- The command, exactly as to be passed to the flock(2) system call.
RETURN VALUE
The explain_flock_or_die function only returns on success, see flock(2) for more information. On failure, prints an explanation and exits, it does not return.The explain_flock_on_error function always returns the value return by the wrapped flock(2) system call.
EXAMPLE
The explain_flock_or_die function is intended to be used in a fashion similar to the following example:explain_flock_or_die(fildes, command);
SEE ALSO
- flock(2)
- apply or remove an advisory lock on an open file
- explain_flock(3)
- explain flock(2) errors
- exit(2)
- terminate the calling process
COPYRIGHT
libexplain version 1.3Copyright (C) 2009 Peter Miller
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