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exit(3) is implemented by the runtime and performs a number of shutdown actions before ultimately calling _exit(2) to terminate the program. We historically named the syscall table entry `exit` rather than `_exit`, but this requires special handling in libc/libsys to cause the `_exit` symbol to exist while implementing `exit` in libc. Declare the syscall as `_exit` and flow that through the system. Because syscall(SYS_exit, code) is fairly widely used, allow a configured extra line in syscall.h to define SYS_exit to SYS__exit. I've found no external uses of __sys_exit() so I've not bothered to create a compatability version of this private symbol. Reviewed by: imp, kib, emaste Differential Revision: https://reviews.freebsd.org/D51672
100 lines
2.6 KiB
Lua
Executable file
100 lines
2.6 KiB
Lua
Executable file
#!/usr/libexec/flua
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--
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-- SPDX-License-Identifier: BSD-2-Clause
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--
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-- Copyright (c) 2024 Tyler Baxter <agge@FreeBSD.org>
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-- Copyright (c) 2023 Warner Losh <imp@bsdimp.com>
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-- Copyright (c) 2019 Kyle Evans <kevans@FreeBSD.org>
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--
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-- Setup to be a module, or ran as its own script.
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local syscall_h = {}
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local script = not pcall(debug.getlocal, 4, 1) -- TRUE if script.
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if script then
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-- Add library root to the package path.
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local path = arg[0]:gsub("/[^/]+.lua$", "")
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package.path = package.path .. ";" .. path .. "/../?.lua"
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end
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local FreeBSDSyscall = require("core.freebsd-syscall")
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local generator = require("tools.generator")
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-- File has not been decided yet; config will decide file. Default defined as
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-- /dev/null.
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syscall_h.file = "/dev/null"
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-- Libc has all the STD, NOSTD and SYSMUX system calls in it, as well as
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-- replaced system calls dating back to FreeBSD 7. We are lucky that the
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-- system call filename is just the base symbol name for it.
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function syscall_h.generate(tbl, config, fh)
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-- Grab the master system calls table, and prepare bookkeeping for
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-- the max system call number.
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local s = tbl.syscalls
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local max = 0
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-- Bind the generator to the parameter file.
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local gen = generator:new({}, fh)
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-- Write the generated preamble.
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gen:preamble("System call numbers.")
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if config.syshdr_extra then
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gen:write(string.format("%s\n\n", config.syshdr_extra))
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end
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for _, v in pairs(s) do
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local c = v:compatLevel()
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if v.num > max then
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max = v.num
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end
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if v.type.UNIMPL then
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goto skip
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elseif v.type.RESERVED then
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goto skip
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elseif v.type.NODEF then
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goto skip
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elseif v.type.STD or v.type.NOSTD or v.type.SYSMUX or
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c >= 7 then
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gen:write(string.format("#define\t%s%s%s\t%d\n",
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config.syscallprefix, v:compatPrefix(), v.name,
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v.num))
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elseif c >= 0 then
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local comment
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if c == 0 then
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comment = "obsolete"
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elseif c == 3 then
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comment = "old"
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else
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comment = "freebsd" .. c
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end
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gen:write(string.format("\t\t\t\t/* %d is %s %s */\n",
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v.num, comment, v.name))
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end
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::skip::
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end
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gen:write(string.format("#define\t%sMAXSYSCALL\t%d\n",
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config.syscallprefix, max + 1))
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end
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-- Entry of script:
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if script then
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local config = require("config")
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if #arg < 1 or #arg > 2 then
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error("usage: " .. arg[0] .. " syscall.master")
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end
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local sysfile, configfile = arg[1], arg[2]
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config.merge(configfile)
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config.mergeCompat()
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-- The parsed system call table.
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local tbl = FreeBSDSyscall:new{sysfile = sysfile, config = config}
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syscall_h.file = config.syshdr -- change file here
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syscall_h.generate(tbl, config, syscall_h.file)
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end
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-- Return the module.
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return syscall_h
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