linux - linux中真的没有超过6个参数的系统调用吗？

Question

在unistd.h中有_syscall0~_syscall6:

_syscall6(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,type5,arg5,type6,arg6)

那么我的结论对不对？

Answer 1

引用:

古代历史

Earlier versions of Linux could handle only four or five system call parameters, and therefore the system calls select() (5 parameters) and mmap() (6 parameters) used to have a single parameter that was a pointer to a parameter block in memory. Since Linux 1.3.0 five parameters are supported (and the earlier select with memory block was renamed old_select), and since Linux 2.3.31 six parameters are supported (and the earlier mmap with memory block was succeeded by the new mmap2).