10213903403
/
os_kernel_lab


								#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_mmap            20

								#define SYS_munmap          21

								#define SYS_shmem           22

								#define SYS_putc            30

								#define SYS_pgdir           31

								#define SYS_open            100

								#define SYS_close           101

								#define SYS_read            102

								#define SYS_write           103

								#define SYS_seek            104

								#define SYS_fstat           110

								#define SYS_fsync           111

								#define SYS_getcwd          121

								#define SYS_getdirentry     128

								#define SYS_dup             130

								/* OLNY FOR LAB6 */

								#define SYS_lab6_set_priority 255


								/* SYS_fork flags */

								#define CLONE_VM            0x00000100  // set if VM shared between processes

								#define CLONE_THREAD        0x00000200  // thread group

								#define CLONE_FS            0x00000800  // set if shared between processes


								/* VFS flags */

								// flags for open: choose one of these

								#define O_RDONLY            0           // open for reading only

								#define O_WRONLY            1           // open for writing only

								#define O_RDWR              2           // open for reading and writing

								// then or in any of these:

								#define O_CREAT             0x00000004  // create file if it does not exist

								#define O_EXCL              0x00000008  // error if O_CREAT and the file exists

								#define O_TRUNC             0x00000010  // truncate file upon open

								#define O_APPEND            0x00000020  // append on each write

								// additonal related definition

								#define O_ACCMODE           3           // mask for O_RDONLY / O_WRONLY / O_RDWR


								#define NO_FD               -0x9527     // invalid fd


								/* lseek codes */

								#define LSEEK_SET           0           // seek relative to beginning of file

								#define LSEEK_CUR           1           // seek relative to current position in file

								#define LSEEK_END           2           // seek relative to end of file


								#define FS_MAX_DNAME_LEN    31

								#define FS_MAX_FNAME_LEN    255

								#define FS_MAX_FPATH_LEN    4095


								#define EXEC_MAX_ARG_NUM    32

								#define EXEC_MAX_ARG_LEN    4095


								#endif /* !__LIBS_UNISTD_H__ */