freebsd通过编译内核添加自定义syscall? [英] freebsd add custom syscall by compiling the kernel?

问题描述

对于学校作业，我必须向freebsd添加自定义helloworld syscall.我使用以下链接作为指南: http://members.tripod.com/s_mathur/bsdhowto.html 好的！ 在第二步中，我遇到了问题:root没有运行它的权限，所以我使用了:"make sysent".看起来还可以. 步骤4说:4.修改Makefile使其包含sys_hello.c等，然后重新编译内核. 哪个makefile?以及如何编译它以及如何调用syscall你好? 提前tnx

for school work I have to add custom helloworld syscall to freebsd. I used following link as my guide: http://members.tripod.com/s_mathur/bsdhowto.html OK! In step two I got problem: root has not permission to run it so I used: "make sysent" instead. seems ok. Step 4 says: 4. Modify the Makefile to include sys_hello.c,etc and recompile the kernel.!!! Which makefile? and how to compile it and how call syscall hello? tnx in advance

推荐答案

如果sys_hello.c包含您的syscall实现-并且位于sys/kern/sys_hello.c中，则将该文件添加到conf/files中.搜索例如.在此处"kern_fork.c"并以类似方式添加sys_hello.c.然后，重建并重新安装内核和世界(使buildkernel buildworld installkernel installworld)；要使userspace部分进入libc.so，必须进行world rebuild.至于调用-好吧，就像调用另一个syscall一样调用它.您将需要在某处添加syscall声明.

If sys_hello.c contains your syscall implementation - and it's in sys/kern/sys_hello.c - then add this file to conf/files. Search for eg. "kern_fork.c" there and add sys_hello.c in a similar way. Afterwards, rebuild and reinstall kernel and world (make buildkernel buildworld installkernel installworld); world rebuild is neccessary to get the userspace part into libc.so. As for calling - well, call it like you would call another syscall. You will need to add the syscall declaration somewhere.

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