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quiet |
Portability: | SAS/C extension |
SYNOPSIS | |
DESCRIPTION | |
RETURN VALUE | |
CAUTION | |
EXAMPLE | |
RELATED FUNCTIONS | |
SEE ALSO |
SYNOPSIS |
#include <lclib.h> void quiet(int flag);
DESCRIPTION |
quiet
suppresses library diagnostics or allows them to be produced. A nonzero argument
requests message suppression, and a 0 argument allows diagnostics to be printed
(if they have not been suppressed by other active functions).
quiet
operates on
a function-by-function basis. If any active function calls
quiet(1)
and does not reset it by calling
quiet(0)
, diagnostics are suppressed. (Thus, a function cannot countermand
a
quiet(1)
issued by its caller. Also
note that
quiet(1)
has no effect after
the function that calls it has terminated.)
You can suppress diagnostics for the entire execution
of a program if
main
issues
quiet(1)
during start-up. If you want to suppress messages in coprocesses,
be sure that the initial
main
function
within each coprocess contains a call to
quiet
. Calling the
quiet
function within
the
main
function of a program that subsequently
creates coprocesses does not suppress messages within the new coprocess. See
Chapter 9, "Coprocessing Functions" in the
SAS/C Library Reference, Volume 2 for more information on
coprocesses.
If the library option
=warning
is specified at run time, calls to
quiet
have no effect. (See Chapter 8, "Run-Time Argument Processing," in
the
SAS/C Compiler and Library User's Guide for more information about
=warning
.)
RETURN VALUE |
quiet
has no return value.
CAUTION |
You should use
quiet
only when a message would be issued by the library for a harmless
condition, or in which the caller can generate a more informative message
for all possible warning conditions.
EXAMPLE |
#include <lclib.h> #include <stdio.h> main() { FILE *f; quiet(1); /* Suppress library messages. */ f = fopen("ddn:SYSLIN", "r"); /* Try to open SYSLIN. */ quiet(0); /* Allow messages again, */ if (!f){ /* or use SYSIN as a backup. */ puts("Unable to open SYSLIN, using SYSIN instead."); f = fopen("ddn:SYSIN", "r"); } }
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