See also: Kernel Index, CPU, Userspace Selftest

This directory implements syscall dispatch and handler entry points that bridge userspace ABI requests to kernel subsystems.

Syscall Dispatch

syscall.c — syscall_dispatch() routes syscall numbers to handlers via a switch statement.

Syscall entry is handled by the architecture layer (kernel/arch/i686/syscall/syscall.c) using int 0x80.

Implemented Syscalls

Number Name Handler Status

1

SYS_EXIT

sys_exit()

Complete

2

SYS_FORK

sys_fork()

Complete

3

SYS_READ

sys_read()

Complete

4

SYS_WRITE

sys_write()

Complete

5

SYS_OPEN

sys_open()

Complete

6

SYS_CLOSE

sys_close()

Complete

11

SYS_EXECVE

sys_execve()

Complete

15

SYS_CHMOD

sys_chmod()

Stub

19

SYS_LSEEK

sys_lseek()

Complete

20

SYS_GETPID

Syscall_GetPid()

Complete

23

SYS_SETUID

Syscall_SetUid()

Complete

24

SYS_GETUID

Syscall_GetUid()

Complete

45

SYS_BRK

sys_brk()

Complete

46

SYS_SETGID

Syscall_SetGid()

Complete

47

SYS_GETGID

Syscall_GetGid()

Complete

64

SYS_GETPPID

Syscall_GetPPid()

Complete

114

SYS_WAIT4

Syscall_Wait4()

Complete

182

SYS_CHOWN

sys_chown()

Stub

186

SYS_SBRK

sys_sbrk()

Complete

Typical Work in This Area

  • Add new syscall handlers (mmap, munmap, ioctl, fcntl, etc.)

  • Improve ABI compatibility and argument validation

  • Harden return/error behavior and scheduler interactions

Revision History

v2.0

Updated for v0.28: complete syscall table with numbers, names, handlers, and status; added dispatch and architecture entry details

v1.0

Initial syscall subsystem summary