初学linux系统调用———syscall(...) VS _syscall

最新推荐文章于 2025-07-22 15:20:49 发布

yobwoc

最新推荐文章于 2025-07-22 15:20:49 发布

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文章标签： linux system parameters user thread file

本文链接：https://blog.youkuaiyun.com/yobwoc/article/details/3944760

这篇博客讨论了在Linux内核中添加自定义系统调用的过程，包括修改syscall_table.S、unistd.h和sys.c。在用户层面测试时遇到了编译错误，通过展开_syscall宏并使用syscall()函数成功解决了问题。

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http://manpages.courier-mta.org/htmlman2/_syscall.2.html
http://manpages.courier-mta.org/htmlman2/syscall.2.html
http://manpages.courier-mta.org/htmlman2/syscalls.2.html
http://blog.youkuaiyun.com/ender049/archive/2008/05/30/2495555.aspx

some disscusionn online:

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Hey guys. I am trying to implement a system call in linux kernel. I usually use ubutntu, but this I am doing on Fedora. I am using kernel 2.6. Here is what I did:
1. Added a line to arch/i386/kernel/syscall_table.S:
.long sys_foo
2. Added a line to linux/include/asm-i386/unistd.h:
#define __NR_foo 324
also incremented the call count by 1.
3. Added this code to sys.c
[code]
asmlinkage long sys_foo(void)
{
printk("Hello Kernel World");
return THREAD_SIZE;
}<