用NET-SNMP软件包开发简单客户端代理(5)
6.3.3 ExampleTable_access.c /*ExampleTable_access.c*/ /* * Note: this file originally auto-generated by mib2c using * :mib2c.access_functions.conf,v 1.9 2004/10/14 12:57:33 dts12 Exp $ */ #include net-snmp/net-snmp-config.h #includenet-snm
6.3.3 ExampleTable_access.c
/*ExampleTable_access.c*/
/*
* Note: this file originally auto-generated by mib2c using
* : mib2c.access_functions.conf,v 1.9 2004/10/14 12:57:33 dts12 Exp $
*/
#include
#include
#include
#include "ExampleTable_access.h"
#include "ExampleTable_enums.h"
#include
struct ExampleTable_entry {
long MachineNumber;
char MachineStatus[10];
u_long CheckTime;
long MonSet;
struct ExampleTable_entry *next;
};
struct ExampleTable_entry *ExampleTable_head=NULL;
/* create a new row in the (unsorted) table */
struct ExampleTable_entry *
ExampleTable_createEntry(long MachineNumber,
char *MachineStatus,
u_long CheckTime,
long MonSet
)
{
struct ExampleTable_entry *entry;
entry = SNMP_MALLOC_TYPEDEF(struct ExampleTable_entry);
if (!entry)
return NULL;
entry->MachineNumber = MachineNumber;
strcpy(entry->MachineStatus ,MachineStatus);
entry->CheckTime = CheckTime;
entry->MonSet =MonSet;
entry->next = ExampleTable_head;
ExampleTable_head = entry;
return entry;
}
/* remove a row from the table */
void
ExampleTable_removeEntry( struct ExampleTable_entry *entry )
{
struct ExampleTable_entry *ptr, *prev;
if (!entry)
return; /* Nothing to remove */
for ( ptr = ExampleTable_head, prev = NULL;
ptr != NULL;
prev = ptr, ptr = ptr->next ) {
if ( ptr == entry )
break;
}
if ( !ptr )
return; /* Can't find it */
if ( prev == NULL )
ExampleTable_head = ptr->next;
else
prev->next = ptr->next;
SNMP_FREE( entry ); /* XXX - release any other internal resources */
}
void data_read(void)
{
FILE *fp;
int i;
struct ExampleTable_entry *temp;
fp=fopen("data.txt","r");
while (ExampleTable_head)/*clean link list begin*/
{
temp=ExampleTable_head->next;
ExampleTable_removeEntry(ExampleTable_head);
ExampleTable_head=temp;
}/*clean link list end*/
temp=SNMP_MALLOC_TYPEDEF(struct ExampleTable_entry);
temp->next=NULL;
/*set up a link list begin*/
if(fp)
{
i=fscanf(fp,"%d %s %d %d",&temp->MachineNumber, temp->MachineStatus, &temp->CheckTime,&temp->MonSet);
/*fscanf return reading var numbers .if EOF return -1.feof() dosen't work well*/
while(i>0)
{
ExampleTable_createEntry(temp->MachineNumber,temp->MachineStatus,temp->CheckTime,temp->MonSet);
i=fscanf(fp,"%d %s %d %d",&temp->MachineNumber, temp->MachineStatus, &temp->CheckTime,&temp->MonSet);
}
SNMP_FREE(temp);
fclose(fp);/*set up a link list end*/
}
else
{
printf("Error:Can't open data.txt!\n");
/*exit(1);*/
}
}
static u_long long_ret;
/** returns the first data point within the ExampleTable table data.
Set the my_loop_context variable to the first data point structure
of your choice (from which you can find the next one). This could
be anything from the first node in a linked list, to an integer
pointer containing the beginning of an array variable.
Set the my_data_context variable to something to be returned to
you later that will provide you with the data to return in a given
row. This could be the same pointer as what my_loop_context is
set to, or something different.
The put_index_data variable contains a list of snmp variable
bindings, one for each index in your table. Set the values of
each appropriately according to the data matching the first row
and return the put_index_data variable at the end of the function.
*/
netsnmp_variable_list *
ExampleTable_get_first_data_point(void **my_loop_context, void **my_data_context,
netsnmp_variable_list *put_index_data,
netsnmp_iterator_info *mydata)
{
data_read();
*my_loop_context = ExampleTable_head;
*my_data_context = ExampleTable_head;
return ExampleTable_get_next_data_point(my_loop_context, my_data_context,
put_index_data, mydata );
}
/** functionally the same as ExampleTable_get_first_data_point, but
my_loop_context has already been set to a previous value and should
be updated to the next in the list. For example, if it was a
linked list, you might want to cast it to your local data type and
then return my_loop_context->next. The my_data_context pointer
should be set to something you need later and the indexes in
put_index_data updated again. */
netsnmp_variable_list *
ExampleTable_get_next_data_point(void **my_loop_context, void **my_data_context,
netsnmp_variable_list *put_index_data,
netsnmp_iterator_info *mydata)
{
struct ExampleTable_entry *entry = (struct ExampleTable_entry *)*my_loop_context;
netsnmp_variable_list *idx = put_index_data;
if ( entry )
{
snmp_set_var_value( idx, (u_char *)&entry->MachineNumber, sizeof(entry->MachineNumber) );
idx = idx->next_variable;
*my_data_context = (void *)entry;
*my_loop_context = (struct ExampleTable_entry *)entry->next;
}
else
{
return NULL;
}
return put_index_data;
}
/** Create a data_context for non-existent rows that SETs are performed on.
* return a void * pointer which will be passed to subsequent get_XXX
* and set_XXX functions for data retrival and modification during
* this SET request.
*
* The indexes are encoded (in order) into the index_data pointer,
* and the column object which triggered the row creation is available
* via the column parameter, if it would be helpful to use that information.
*/
/*
void *
ExampleTable_create_data_context(netsnmp_variable_list *index_data) {
return entry; /* XXX: you likely want to return a real pointer */
/*
}
*/
/** If the implemented set_* functions don't operate directly on the
real-live data (which is actually recommended), then this function
can be used to take a given my_data_context pointer and "commit" it
to whereever the modified data needs to be put back to. For
example, if this was a routing table you could publish the modified
routes back into the kernel at this point.
new_or_del will be set to 1 if new, or -1 if it should be deleted
or 0 if it is just a modification of an existing row.
If you free the data yourself, make sure to *my_data_context = NULL */
int
ExampleTable_commit_row(void **my_data_context, int new_or_del)
{
/** Add any necessary commit code here */
/* */
/* return no errors. And there shouldn't be any!!! Ever!!! You
should have checked the values long before this. */
return SNMP_ERR_NOERROR;
}
/* User-defined data access functions (per column) for data in table ExampleTable */
/*
* NOTE:
* - these get_ routines MUST return data that will not be freed (ie,
* use static variables or persistent data). It will be copied, if
* needed, immediately after the get_ routine has been called.
* - these SET routines must copy the incoming data and can not take
* ownership of the memory passed in by the val pointer.
*/
/** XXX: return a data pointer to the data for the MachineNumber column and set
ret_len to its proper size in bytes. */
long *get_MachineNumber(void *data_context, size_t *ret_len) {
struct ExampleTable_entry *entry=(struct ExampleTable_entry *)data_context;
long_ret=entry->MachineNumber;
*ret_len=sizeof(long_ret);
return &long_ret; /** XXX: replace this with a pointer to a real value */
}
/** XXX: return a data pointer to the data for the MachineStatus column and set
ret_len to its proper size in bytes. */
char *get_MachineStatus(void *data_context, size_t *ret_len) {
struct ExampleTable_entry *entry=(struct ExampleTable_entry *)data_context;
*ret_len=strlen(entry->MachineStatus);
return entry->MachineStatus; /** XXX: replace this with a pointer to a real value */
}
/** XXX: return a data pointer to the data for the CheckTime column and set
ret_len to its proper size in bytes. */
u_long *get_CheckTime(void *data_context, size_t *ret_len) {
struct ExampleTable_entry *entry=(struct ExampleTable_entry *)data_context;
long_ret=entry->CheckTime;
*ret_len=sizeof(long_ret);
return &long_ret; /** XXX: replace this with a pointer to a real value */
}
/** XXX: return a data pointer to the data for the MonSet column and set
ret_len to its proper size in bytes. */
long *get_MonSet(void *data_context, size_t *ret_len) {
struct ExampleTable_entry *entry=(struct ExampleTable_entry *)data_context;
long_ret=entry->MonSet;
*ret_len=sizeof(long_ret);
return &long_ret; /** XXX: replace this with a pointer to a real value */
}
/** XXX: Set the value of the MonSet column and return
SNMP_ERR_NOERROR on success
SNMP_ERR_XXX for SNMP deterministic error codes
SNMP_ERR_GENERR on generic failures (a last result response). */
int set_MonSet(void *data_context, long *val, size_t val_len) {
FILE *fp;
struct ExampleTable_entry *temp=ExampleTable_head,*entry=data_context;
memcpy(&entry->MonSet, val, val_len);
fp=fopen("data.txt","w+");
if(!fp)
{DEBUGMSGTL(("set_MonSet","Open file failure\n"));
return SNMP_ERR_NOACCESS;
}
else
while(temp)
{
fprintf(fp,"\n%d %s %d %d",temp->MachineNumber,
temp->MachineStatus,
temp->CheckTime,
temp->MonSet);
temp=temp->next;
}
fclose(fp);
return SNMP_ERR_NOERROR; /** XXX: change if an error occurs */
}