A.4 Builtin Constants

The x86_64 backend provides the following constants automatically (no declaration needed):

Syscall Numbers:

Constant	Value	Description
`SYS_READ`	0	Read from file descriptor
`SYS_WRITE`	1	Write to file descriptor
`SYS_OPEN`	2	Open file
`SYS_CLOSE`	3	Close file descriptor
`SYS_STAT`	4	Get file status
`SYS_FSTAT`	5	Get file status by fd
`SYS_LSEEK`	8	Reposition file offset
`SYS_MMAP`	9	Map memory
`SYS_MUNMAP`	11	Unmap memory
`SYS_BRK`	12	Change data segment size
`SYS_IOCTL`	16	Device control
`SYS_PIPE`	22	Create pipe
`SYS_DUP`	32	Duplicate fd
`SYS_DUP2`	33	Duplicate fd to specific number
`SYS_GETPID`	39	Get process ID
`SYS_FORK`	57	Create child process
`SYS_EXECVE`	59	Execute program
`SYS_EXIT`	60	Exit process
`SYS_WAIT4`	61	Wait for process
`SYS_KILL`	62	Send signal
`SYS_GETCWD`	79	Get current directory
`SYS_CHDIR`	80	Change directory
`SYS_MKDIR`	83	Create directory
`SYS_RMDIR`	84	Remove directory
`SYS_CREAT`	85	Create file
`SYS_UNLINK`	87	Delete file
`SYS_GETUID`	102	Get user ID
`SYS_GETGID`	104	Get group ID
`SYS_GETEUID`	107	Get effective user ID
`SYS_GETEGID`	108	Get effective group ID
`SYS_CLOCK_GETTIME`	228	Get time
`SYS_EXIT_GROUP`	231	Exit all threads

File Descriptors:

Open Flags:

Memory Mapping:

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