Types and Constants

Types and constants exported by the BSD module.

Module: BSD

Standard File Descriptors

Name	Type	Value	Description
Stdin	int32	0	Standard input.
Stdout	int32	1	Standard output.
Stderr	int32	2	Standard error.

A process may close or redirect these conventional descriptors.

Syscall Numbers

Name	Type	Value
SYS_EXIT	uint64	1
SYS_READ	uint64	3
SYS_WRITE	uint64	4
SYS_CLOSE	uint64	6
SYS_GETPID	uint64	20
SYS_BRK	uint64	45
SYS_MUNMAP	uint64	73

The package uses dedicated per-BSD thunks instead of exported syscall numbers for mmap, nanosleep, and clock_gettime.

Memory Protection

Name	Type	Value	Description
PROT_READ	int32	1	Pages may be read.
PROT_WRITE	int32	2	Pages may be written.
PROT_EXEC	int32	4	Pages may be executed.

Mapping Flags

Name	Type	Value	Description
MAP_PRIVATE	int32	2	Create a private copy-on-write mapping.
MAP_ANONYMOUS	int32	4096	Create a mapping not backed by a file.

OpenBSD uses 32 for its native anonymous-mapping flag. Use MAP_ANONYMOUS with the package's Mmap compatibility wrapper rather than passing it to an arbitrary raw OpenBSD syscall.

Clock IDs

Name	Type	Value	Description
CLOCK_REALTIME	int32	0	Adjustable wall-clock time.
CLOCK_MONOTONIC	int32	4	Monotonic time for interval measurement.

OpenBSD uses 3 for its native monotonic-clock ID. Use this compatibility constant with ClockGettime.

timespec

struct timespec {
    tv_sec:  int64;
    tv_nsec: int64;
}

Field	Type	Description
tv_sec	int64	Whole seconds.
tv_nsec	int64	Nanoseconds within the second, normally 0-999,999,999.

The lowercase type name is part of the current public API. It is used by Nanosleep and ClockGettime.

See also

• Mmap - use protection and mapping flags
• Time - use clocks and timespec
• Raw syscalls - use shared syscall numbers