net-snmp로 subagent를 만드는데 semaphore.h를 include 안했을 때 에러가 나네요.

/*
 * Note: this file originally auto-generated by mib2c using
 *  : mib2c.iterate.conf 16004 2007-03-27 09:20:28Z dts12 $
 */
 
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
#include <semaphore.h>
#include "common.h"
#include "nex_common.h"
#include "module.h"
#include "nex_module.h"
#include "nex_module.c"
 
static sem_t module_sem;
 
/*
 * Typical data structure for a row entry
 */
struct moduleTable_entry {
    /*
     * Index values
     */
    long            modulenum;
 
    /*
     * Column values
     */
    long            devicetype;
    long            old_devicetype;
    long            devicemode;
    long            old_devicemode;
    char            description;
    char            old_description;
    char            type;
    char            firmware;
    char            uptime;
    char            restart;
    char            old_restart;
 
    /*
     * Illustrate using a simple linked list
     */
 
................................................
 
netsnmp_variable_list *moduleTable_get_first_data_point(void **my_loop_context,
                                 void **my_data_context,
                                 netsnmp_variable_list * put_index_data,
                                 netsnmp_iterator_info *mydata)
{
    *my_loop_context = moduleTable_head;
    return moduleTable_get_next_data_point(my_loop_context,my_data_context, put_index_data,mydata);
}
 
netsnmp_variable_list * moduleTable_get_next_data_point(void **my_loop_context,
                                void **my_data_context,
                                netsnmp_variable_list * put_index_data,
                                netsnmp_iterator_info *mydata)
{
    struct moduleTable_entry *entry =  (struct moduleTable_entry *) *my_loop_context;
    netsnmp_variable_list *idx = put_index_data;
 
        struct moduleTable_entry *ptr;
        struct moduleTalbe_entry *prev;
        int     find=0;
        sem_wait(&module_sem);
        for (ptr = moduleTable_head, prev = NULL; ptr != NULL; prev = ptr, ptr = ptr->next) {
                if (entry == ptr){
                        find = 1;
                        printf("entry : %d  ptr: %d  find : %d \n", entry, ptr, find);
                }
        }
 
    if (entry && find) {
        snmp_set_var_value(idx, (u_char *)&entry->modulenum, sizeof(entry->modulenum));
        printf("modulenum : %d  idx : %d  (u_char *)&entry->modulenum : %d  sizeof(entry->modulenum) : %d \n", idx, entry->modulenum, (u_char *)&entry->modulenum, sizeof(entry->modulenum));
        idx = idx->next_variable;
        *my_data_context = (void *) entry;
        *my_loop_context = (void *) entry->next;
                printf("put_index_data : %d \n", put_index_data);
                sem_post(&module_sem);
                return put_index_data;
    } else {
                sem_post(&module_sem);
        return NULL;
    }
}

net-snmp-config --compile-subagent "서브에이젼트명" "소스명"

[root@localhost nextest]# net-snmp-config --compile-subagent module module.c
generating the tmporary code file: netsnmptmp.29599.c
void            init_module(void);
checking for init_module in module.c
void init_module(void)
running: ppc_82xx-gcc  -g -O2 -Dlinux  -I. -I/home/test/install/usr/include -o module netsnmptmp.29599.c  module.c  -L/home/test/install/usr/lib -lnetsnmpmibs -lnetsnmpagent -lnetsnmphelpers -lnetsnmp -ldl -lcrypto -lm    
module.c: In function 'moduleTable_get_next_data_point':
module.c:285: warning: assignment from incompatible pointer type
/tmp/cc5rU0Qx.o: In function `moduleTable_remove':
/home/test/net-snmp-5.3.2/agent/mibgroup/nextest/module.c:238: undefined reference to `sem_wait'
/home/test/net-snmp-5.3.2/agent/mibgroup/nextest/module.c:256: undefined reference to `sem_post'
/home/test/net-snmp-5.3.2/agent/mibgroup/nextest/module.c:246: undefined reference to `sem_post'
/tmp/cc5rU0Qx.o: In function `moduleTable_createEntry':
/home/test/net-snmp-5.3.2/agent/mibgroup/nextest/module.c:195: undefined reference to `sem_wait'
/home/test/net-snmp-5.3.2/agent/mibgroup/nextest/module.c:198: undefined reference to `sem_post'
/tmp/cc5rU0Qx.o: In function `init_module':
/home/test/net-snmp-5.3.2/agent/mibgroup/nextest/module.c:139: undefined reference to `sem_init'
/tmp/cc5rU0Qx.o: In function `moduleTable_removeEntry':
/home/test/net-snmp-5.3.2/agent/mibgroup/nextest/module.c:213: undefined reference to `sem_wait'
/home/test/net-snmp-5.3.2/agent/mibgroup/nextest/module.c:229: undefined reference to `sem_post'
/home/test/net-snmp-5.3.2/agent/mibgroup/nextest/module.c:219: undefined reference to `sem_post'
/tmp/cc5rU0Qx.o: In function `moduleTable_get_next_data_point':
/home/test/net-snmp-5.3.2/agent/mibgroup/nextest/module.c:284: undefined reference to `sem_wait'
/home/test/net-snmp-5.3.2/agent/mibgroup/nextest/module.c:302: undefined reference to `sem_post'
/home/test/net-snmp-5.3.2/agent/mibgroup/nextest/module.c:299: undefined reference to `sem_post'
collect2: ld returned 1 exit status
removing the tmporary code file: netsnmptmp.29599.c