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what followin code is doin?

hi all
    pls tell me what is the meaning of this code

-------------------------------------------------------
int exec_interrupt(const char *filename, const arg[], const char *envp[])

{
      long __res;
      __asm__ volatile("int $0x80" :a" (__res): "0" (__NE_exec_call),"b"((long)(filename),"c" ((long)(argv)),"d"((long)(envp)));

       return (int __res);
} 
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manish arya


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