《操作系统》的实验代码。
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#ifndef __LIBS_UNISTD_H__
#define __LIBS_UNISTD_H__
#define T_SYSCALL 0x80
/* syscall number */
#define SYS_exit 1
#define SYS_fork 2
#define SYS_wait 3
#define SYS_exec 4
#define SYS_clone 5
#define SYS_yield 10
#define SYS_sleep 11
#define SYS_kill 12
#define SYS_gettime 17
#define SYS_getpid 18
#define SYS_brk 19
#define SYS_mmap 20
#define SYS_munmap 21
#define SYS_shmem 22
#define SYS_putc 30
#define SYS_pgdir 31
/* SYS_fork flags */
#define CLONE_VM 0x00000100 // set if VM shared between processes
#define CLONE_THREAD 0x00000200 // thread group
#endif /* !__LIBS_UNISTD_H__ */