linux C 调用系统接口卸载模块 范例

#include <stdio.h>
#include <stdlib.h>
# include <sys/syscall.h>    // syscall() , __NR_init_module
#include <sys/stat.h>
#include <errno.h>               // ENOEXEC

#include <fcntl.h>        // O_RDONLY 
#include <sys/mman.h>    // PROT_READ , MAP_PRIVATE , MAP_FAILED

# define init_module(mod, len, opts) syscall(__NR_init_module, mod, len, opts)
# define delete_module(mod, flags) syscall(__NR_delete_module, mod, flags)

#define MPI_NAME "ct_def"    //

void moderror(int err)
{
    switch (err) {
    case -1: /* btw: it's -EPERM */
        printf("no such module");
        return;
    case ENOEXEC:
        printf( "invalid module format");
        return;
    case ENOENT:
        printf( "unknown symbol in module, or unknown parameter");
        return;
    case ESRCH:
        printf("module has wrong symbol version");
        return ;
    case ENOSYS:
        printf("kernel does not support requested operation");
        return ;
    default :
        printf("unknown errcode(%d)",err);
        return ;
    }
}

 

 

int main(void )
{
    unsigned flags = O_NONBLOCK | O_EXCL;
    int ret;

    errno=0;
    ret=delete_module(MPI_NAME, flags);
           if (ret != 0) { 
        printf("cannot rmmod  : ");
        moderror(errno);
        printf("\n ");
    }
    printf("removed\n");
    return 0;
}

 

错误的码的定义在Linux/include/asm-generic/errno-base.h 文件中