.TH "A generic callback mechanism" 3 "24 Jun 2011" "Version 5.4.3.pre1" "net-snmp" \" -*- nroff -*-
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.nh
.SH NAME
A generic callback mechanism \- 
.SS "Defines"

.in +1c
.ti -1c
.RI "#define \fBCALLBACK_NAME_LOGGING\fP   1"
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.RI "#define \fBLOCK_PER_CALLBACK_SUBID\fP   1"
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.RI "#define \fBCALLBACK_LOCK\fP(maj, min)   ++_locks[maj][min]"
.br
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.RI "#define \fBCALLBACK_UNLOCK\fP(maj, min)   --_locks[maj][min]"
.br
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.RI "#define \fBCALLBACK_LOCK_COUNT\fP(maj, min)   _locks[maj][min]"
.br
.in -1c
.SS "Functions"

.in +1c
.ti -1c
.RI "NETSNMP_STATIC_INLINE int \fB_callback_lock\fP (int major, int minor, const char *warn, int assert)"
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.RI "NETSNMP_STATIC_INLINE void \fB_callback_unlock\fP (int major, int minor)"
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.RI "void \fBinit_callbacks\fP (void)"
.br
.ti -1c
.RI "int \fBsnmp_register_callback\fP (int major, int minor, SNMPCallback *new_callback, void *arg)"
.br
.RI "\fIThis function registers a generic callback function. \fP"
.ti -1c
.RI "int \fBnetsnmp_register_callback\fP (int major, int minor, SNMPCallback *new_callback, void *arg, int priority)"
.br
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.RI "int \fBsnmp_call_callbacks\fP (int major, int minor, void *caller_arg)"
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.RI "\fIThis function calls the callback function for each registered callback of type major and minor. \fP"
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.RI "int \fBsnmp_count_callbacks\fP (int major, int minor)"
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.ti -1c
.RI "int \fBsnmp_callback_available\fP (int major, int minor)"
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.RI "int \fBsnmp_unregister_callback\fP (int major, int minor, SNMPCallback *target, void *arg, int matchargs)"
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.RI "\fIThis function unregisters a specified callback function given a major and minor type. \fP"
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.RI "int \fBnetsnmp_callback_clear_client_arg\fP (void *ptr, int i, int j)"
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.RI "\fIfind and clear client args that match ptr \fP"
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.RI "void \fBclear_callback\fP (void)"
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.RI "struct \fBsnmp_gen_callback\fP * \fBsnmp_callback_list\fP (int major, int minor)"
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.in -1c
.SH "Function Documentation"
.PP 
.SS "int netsnmp_callback_clear_client_arg (void * ptr, int i, int j)"
.PP
find and clear client args that match ptr \fBParameters:\fP
.RS 4
\fIptr\fP pointer to search for 
.br
\fIi\fP callback id to start at 
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\fIj\fP callback subid to start at 
.RE
.PP

.PP
Definition at line 477 of file callback.c.
.SS "int snmp_call_callbacks (int major, int minor, void * caller_arg)"
.PP
This function calls the callback function for each registered callback of type major and minor. \fBParameters:\fP
.RS 4
\fImajor\fP is the SNMP callback major type used
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\fIminor\fP is the SNMP callback minor type used
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\fIcaller_arg\fP is a void pointer which is sent in as the callback's serverarg parameter, if needed.
.RE
.PP
\fBReturns:\fP
.RS 4
Returns SNMPERR_GENERR if major is >= MAX_CALLBACK_IDS or minor is >= MAX_CALLBACK_SUBIDS, otherwise SNMPERR_SUCCESS is returned.
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsnmp_register_callback\fP 
.PP
\fBsnmp_unregister_callback\fP 
.RE
.PP

.PP
Definition at line 301 of file callback.c.
.SS "int snmp_register_callback (int major, int minor, SNMPCallback * new_callback, void * arg)"
.PP
This function registers a generic callback function. The major and minor values are used to set the new_callback function into a global static multi-dimensional array of type struct \fBsnmp_gen_callback\fP. The function makes sure to append this callback function at the end of the link list, snmp_gen_callback->next.
.PP
\fBParameters:\fP
.RS 4
\fImajor\fP is the SNMP callback major type used
.IP "\(bu" 2
SNMP_CALLBACK_LIBRARY
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.RE
.PP
.IP "\(bu" 2
SNMP_CALLBACK_APPLICATION
.PP
.PP
\fBParameters:\fP
.RS 4
\fIminor\fP is the SNMP callback minor type used
.IP "\(bu" 2
SNMP_CALLBACK_POST_READ_CONFIG
.IP "\(bu" 2
SNMP_CALLBACK_STORE_DATA
.IP "\(bu" 2
SNMP_CALLBACK_SHUTDOWN
.IP "\(bu" 2
SNMP_CALLBACK_POST_PREMIB_READ_CONFIG
.IP "\(bu" 2
SNMP_CALLBACK_LOGGING
.IP "\(bu" 2
SNMP_CALLBACK_SESSION_INIT
.PP
.br
\fInew_callback\fP is the callback function that is registered.
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\fIarg\fP when not NULL is a void pointer used whenever new_callback function is exercised.
.RE
.PP
\fBReturns:\fP
.RS 4
Returns SNMPERR_GENERR if major is >= MAX_CALLBACK_IDS or minor is >= MAX_CALLBACK_SUBIDS or a \fBsnmp_gen_callback\fP pointer could not be allocated, otherwise SNMPERR_SUCCESS is returned.
.IP "\(bu" 2
#define MAX_CALLBACK_IDS 2
.IP "\(bu" 2
#define MAX_CALLBACK_SUBIDS 16
.PP
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsnmp_call_callbacks\fP 
.PP
\fBsnmp_unregister_callback\fP 
.RE
.PP

.PP
Definition at line 233 of file callback.c.
.SS "int snmp_unregister_callback (int major, int minor, SNMPCallback * target, void * arg, int matchargs)"
.PP
This function unregisters a specified callback function given a major and minor type. Note: no bound checking on major and minor.
.PP
\fBParameters:\fP
.RS 4
\fImajor\fP is the SNMP callback major type used
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\fIminor\fP is the SNMP callback minor type used
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\fItarget\fP is the callback function that will be unregistered.
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\fIarg\fP is a void pointer used for comparison against the registered callback's sc_client_arg \fBvariable\fP.
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\fImatchargs\fP is an integer used to bypass the comparison of arg and the callback's sc_client_arg \fBvariable\fP only when matchargs is set to 0.
.RE
.PP
\fBReturns:\fP
.RS 4
Returns the number of callbacks that were unregistered.
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsnmp_register_callback\fP 
.PP
\fBsnmp_call_callbacks\fP 
.RE
.PP

.PP
set cleanup flag? 
.PP
Definition at line 421 of file callback.c.
.SH "Author"
.PP 
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