'\" te
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.TH CPC_SETERRHNDLR 3CPC "April 9, 2016"
.SH NAME
cpc_seterrhndlr \- control libcpc error reporting
.SH SYNOPSIS
.LP
.nf
cc [ \fIflag\fR\&.\|.\|. ] \fIfile\fR\&.\|.\|. \fB-lcpc\fR [ \fIlibrary\fR\&.\|.\|. ]
#include <libcpc.h>

\fBtypedef void(\fR\fBcpc_errhndlr_t\fR)(\fBcpc_t *\fR\fIcpc\fR, \fBconst char *\fR\fIfn\fR, \fBint\fR \fIsubcode\fR,
     \fBconst char *\fR\fIfmt\fR, \fBva_list\fR \fIap\fR);
.fi

.LP
.nf
\fBvoid\fR \fBcpc_seterrhndlr\fR(\fBcpc_t *\fR\fIcpc\fR, \fBcpc_errhndlr_t *\fR\fIerrfn\fR);
.fi

.SH DESCRIPTION
.LP
For the convenience of programmers instrumenting their code, several
\fBlibcpc\fR(3LIB) functions automatically emit to \fBstderr\fR error messages
that attempt to provide a more detailed explanation of their error return
values.  While this can be useful for simple programs, some applications might
wanat to report their errors differently, for example, to a window or to a log
file.
.sp
.LP
The \fBcpc_seterrhndlr()\fR function allows the caller to provide an alternate
function for reporting errors. The type signature is shown in the SYNOPSIS. The
\fIfn\fR argument is passed the library function name that detected the error,
an integer subcode indicating the specific error condition that has occurred,
and the format string \fIfmt\fR that contains a textual description of the
integer subcode. The format string \fIfmt\fR and argument pointer \fIap\fR can
be passed directly to \fBvsnprintf\fR(3C) or similar \fIvarargs\fR-based
function for formatting.
.sp
.LP
The integer subcodes are provided to allow programs to recognize error
conditions while using \fBlibcpc\fR. The \fIfmt\fR string is provided as a
convenience for easy printing. The error subcodes are:
.sp
.ne 2
.na
\fB\fBCPC_INVALID_EVENT\fR\fR
.ad
.sp .6
.RS 4n
A specified event is not supported by the processor.
.RE

.sp
.ne 2
.na
\fB\fBCPC_INVALID_PICNUM\fR\fR
.ad
.sp .6
.RS 4n
The counter number does not fall in the range of available counters.
.RE

.sp
.ne 2
.na
\fB\fBCPC_INVALID_ATTRIBUTE\fR\fR
.ad
.sp .6
.RS 4n
A specified attribute is not supported by the processor.
.RE

.sp
.ne 2
.na
\fB\fBCPC_ATTRIBUTE_OUT_OF_RANGE\fR\fR
.ad
.sp .6
.RS 4n
The value of an attribute is outside the range supported by the processor.
.RE

.sp
.ne 2
.na
\fB\fBCPC_RESOURCE_UNAVAIL\fR\fR
.ad
.sp .6
.RS 4n
A hardware resource necessary for completing an operation was unavailable.
.RE

.sp
.ne 2
.na
\fB\fBCPC_PIC_NOT_CAPABLE\fR\fR
.ad
.sp .6
.RS 4n
The requested counter cannot count an assigned event.
.RE

.sp
.ne 2
.na
\fB\fBCPC_REQ_INVALID_FLAGS\fR\fR
.ad
.sp .6
.RS 4n
One or more requests has invalid flags.
.RE

.sp
.ne 2
.na
\fB\fBCPC_CONFLICTING_REQS\fR\fR
.ad
.sp .6
.RS 4n
The requests in a set cannot be programmed onto the hardware at the same time.
.RE

.sp
.ne 2
.na
\fB\fBCPC_ATTR_REQUIRES_PRIVILEGE\fR\fR
.ad
.sp .6
.RS 4n
A request contains an attribute which requires the cpc_cpu privilege, which the
process does not have.
.RE

.sp
.LP
The default printing routine can be restored by calling  the routine with an
\fIerrfn\fR argument of \fINULL\fR.
.SH EXAMPLES
.LP
\fBExample 1 \fRDebugging example.
.sp
.LP
The following example produces error messages only when debugging the program
containing it, or when the \fBcpc_bind_curlwp()\fR, \fBcpc_bind_cpu()\fR, or
\fBcpc_bind_pctx()\fR functions are reporting an error when binding a
cpc_set_t.

.sp
.in +2
.nf
int debugging;
void
myapp_errfn(const char *fn, int subcode, const char *fmt, va_list ap)
{
        if (strncmp(fn, "cpc_bind", 8) != 0 && !debugging)
            return;
        (void) fprintf(stderr, "myapp: cpc_%s(): ", fn);
        (void) vfprintf(stderr, fmt, ap);
}
.fi
.in -2

.SH ATTRIBUTES
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Evolving
_
MT-Level	Safe
.TE

.SH SEE ALSO
.LP
\fBcpc_bind_curlwp\fR(3CPC), \fBlibcpc\fR(3LIB), \fBvsnprintf\fR(3C),
\fBattributes\fR(5)