explain_vprintf_or_die(3) [debian man page]

explain_vprintf_or_die(3)				     Library Functions Manual					 explain_vprintf_or_die(3)

NAME

       explain_vprintf_or_die - formatted output conversion and report errors

SYNOPSIS

       #include <libexplain/vprintf.h>
       int explain_vprintf_or_die(const char *format, va_list ap);
       int explain_vprintf_on_error(const char *format, va_list ap);

DESCRIPTION

       The  explain_vprintf_or_die  function  is  used	to  call  the vprintf(3) system call. On failure an explanation will be printed to stderr,
       obtained from the explain_vprintf(3) function, and then the process terminates by calling exit(EXIT_FAILURE).

       The explain_vprintf_on_error function is used to call the vprintf(3) system call. On failure an explanation  will  be  printed  to  stderr,
       obtained from the explain_vprintf(3) function, but still returns to the caller.

       format  The format, exactly as to be passed to the vprintf(3) system call.

       ap      The ap, exactly as to be passed to the vprintf(3) system call.

RETURN VALUE

       The  explain_vprintf_or_die  function  only  returns on success, see vprintf(3) for more information. On failure, prints an explanation and
       exits, it does not return.

       The explain_vprintf_on_error function always returns the value return by the wrapped vprintf(3) system call.

EXAMPLE

       The explain_vprintf_or_die function is intended to be used in a fashion similar to the following example:
	      int result = explain_vprintf_or_die(format, ap);

SEE ALSO

       vprintf(3)
	       formatted output conversion

       explain_vprintf(3)
	       explain vprintf(3) errors

       exit(2) terminate the calling process

COPYRIGHT

       libexplain version 0.52
       Copyright (C) 2010 Peter Miller

															 explain_vprintf_or_die(3)

explain_system_or_die(3)				     Library Functions Manual					  explain_system_or_die(3)

NAME

       explain_system_or_die - execute a shell command and report errors

SYNOPSIS

       #include <libexplain/system.h>
       void explain_system_or_die(const char *command);
       void explain_system_success_or_die(const char *command);
       int explain_system_success(const char *command);

DESCRIPTION

       These functions may be used to execute commands via the system(3) function, and report the results.

   explain_system_or_die
       void explain_system_or_die(const char *command);

       The  explain_system_or_die  function  is  used  to  call  the  system(3) system call.  On failure an explanation will be printed to stderr,
       obtained from explain_system(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:
	      int status = explain_system_or_die(command);

       command The command, exactly as to be passed to the system(3) system call.

       Returns:
	       This function only returns on success, see system(3) for more information.  On failure, prints an explanation and exits.

   explain_system_success_or_die
       void explain_system_success_or_die(const char *command);

       The explain_system_success_or_die function is used to call the system(3) system call.  On failure, including any  exit  status  other  than
       EXIT_SUCCESS,  an  explanation  will  be  printed  to  stderr,  obtained from explain_system(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_system_success_or_die(command);

       command The command, exactly as to be passed to the system(3) system call.

       Returns:
	       This function only returns on success.  On failure, prints an explanation and exits.

   explain_system_success
       int explain_system_success(const char *command);

       The explain_system_success function is used to call the system(3) system call.  On failure, including any exit status other than  EXIT_SUC-
       CESS,  an explanation will be printed to stderr, obtained from explain_system(3).  However, the priniting of an error message does not also
       cause exit(2) to be called.

       This function is intended to be used in a fashion similar to the following example:
	      int status = explain_system_success(command);

       command The command, exactly as to be passed to the system(3) system call.

       Returns:
	       the value returned by the system(3) system call.  In all cases other than EXIT_SUCCESS,	an  error  message  will  also	have  been
	       printed to stderr.

SEE ALSO

       system(3)
	       execute a shell command

       explain_system(3)
	       explain system(3) errors

       exit(2) terminate the calling process

COPYRIGHT

       libexplain version 0.52
       Copyright (C) 2008 Peter Miller

															  explain_system_or_die(3)