makesyscalls: sprinkle some assert() on standard function calls
Improves our error reporting, ensuring that we aren't just ignoring errors in the common case. Note specifically the boundary where we have to change up our error handling approach. It's fine to error() out up until we create the tempdir, then the rest should try to handle it gracefully and abort(). A future change will clean this up further by pcall'ing all of the bits that cannot currently error() without cleaning up.
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e12a0ffe2b
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@ -95,28 +95,30 @@ local files = {}
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local function cleanup()
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for _, v in pairs(files) do
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v:close()
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assert(v:close())
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end
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if cleantmp then
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if lfs.dir(tmpspace) then
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for fname in lfs.dir(tmpspace) do
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if fname ~= "." and fname ~= ".." then
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os.remove(tmpspace .. "/" .. fname))
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assert(os.remove(tmpspace .. "/" ..
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fname))
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end
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end
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end
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if lfs.attributes(tmpspace) and not lfs.rmdir(tmpspace) then
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io.stderr:write("Failed to clean up tmpdir: " ..
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tmpspace .. "\n")
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assert(io.stderr:write("Failed to clean up tmpdir: " ..
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tmpspace .. "\n"))
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end
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else
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io.stderr:write("Temp files left in " .. tmpspace .. "\n")
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assert(io.stderr:write("Temp files left in " .. tmpspace ..
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"\n"))
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end
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end
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local function abort(status, msg)
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io.stderr:write(msg .. "\n")
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assert(io.stderr:write(msg .. "\n"))
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cleanup()
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os.exit(status)
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end
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@ -208,14 +210,11 @@ local function process_config(file)
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-- would need to sanitize the line for potentially special characters.
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local line_expr = "^([%w%p]+%s*)=(%s*[`\"]?[^\"`]+[`\"]?)"
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if file == nil then
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if not file then
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return nil, "No file given"
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end
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local fh = io.open(file)
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if fh == nil then
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return nil, "Could not open file"
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end
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local fh = assert(io.open(file))
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for nextline in fh:lines() do
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-- Strip any whole-line comments
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@ -262,7 +261,7 @@ local function process_config(file)
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end
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end
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io.close(fh)
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assert(io.close(fh))
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return cfg
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end
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@ -291,7 +290,7 @@ local function grab_capenabled(file, open_fail_ok)
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end
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end
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io.close(fh)
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assert(io.close(fh))
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return capentries
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end
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@ -369,8 +368,8 @@ local function read_file(tmpfile)
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end
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local fh = files[tmpfile]
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fh:seek("set")
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return fh:read("a")
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assert(fh:seek("set"))
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return assert(fh:read("a"))
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end
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local function write_line(tmpfile, line)
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@ -378,13 +377,13 @@ local function write_line(tmpfile, line)
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print("Not found: " .. tmpfile)
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return
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end
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files[tmpfile]:write(line)
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assert(files[tmpfile]:write(line))
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end
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local function write_line_pfile(tmppat, line)
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for k in pairs(files) do
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if k:match(tmppat) ~= nil then
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files[k]:write(line)
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assert(files[k]:write(line))
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end
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end
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end
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@ -505,7 +504,7 @@ local function process_sysfile(file)
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process_syscall_def(prevline)
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end
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io.close(fh)
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assert(io.close(fh))
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return capentries
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end
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@ -1108,7 +1107,7 @@ end
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-- Entry point
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if #arg < 1 or #arg > 2 then
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abort(1, "usage: " .. arg[0] .. " input-file <config-file>")
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error("usage: " .. arg[0] .. " input-file <config-file>")
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end
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local sysfile, configfile = arg[1], arg[2]
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@ -1116,13 +1115,7 @@ local sysfile, configfile = arg[1], arg[2]
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-- process_config either returns nil and a message, or a
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-- table that we should merge into the global config
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if configfile ~= nil then
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local res, msg = process_config(configfile)
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if res == nil then
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-- Error... handle?
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print(msg)
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os.exit(1)
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end
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local res = assert(process_config(configfile))
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for k, v in pairs(res) do
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if v ~= config[k] then
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@ -1150,17 +1143,28 @@ process_compat()
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process_abi_flags()
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if not lfs.mkdir(tmpspace) then
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abort(1, "Failed to create tempdir " .. tmpspace)
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error("Failed to create tempdir " .. tmpspace)
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end
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-- XXX Revisit the error handling here, we should probably move the rest of this
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-- into a function that we pcall() so we can catch the errors and clean up
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-- gracefully.
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for _, v in ipairs(temp_files) do
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local tmpname = tmpspace .. v
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files[v] = io.open(tmpname, "w+")
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-- XXX Revisit these with a pcall() + error handler
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if not files[v] then
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abort(1, "Failed to open temp file: " .. tmpname)
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end
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end
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for _, v in ipairs(output_files) do
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local tmpname = tmpspace .. v
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files[v] = io.open(tmpname, "w+")
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-- XXX Revisit these with a pcall() + error handler
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if not files[v] then
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abort(1, "Failed to open temp output file: " .. tmpname)
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end
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end
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-- Write out all of the preamble bits
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@ -1358,12 +1362,12 @@ write_line("systrace", read_file("systraceret"))
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for _, v in ipairs(output_files) do
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local target = config[v]
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if target ~= "/dev/null" then
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local fh = io.open(target, "w+")
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local fh = assert(io.open(target, "w+"))
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if fh == nil then
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abort(1, "Failed to open '" .. target .. "'")
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end
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fh:write(read_file(v))
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fh:close()
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assert(fh:write(read_file(v)))
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assert(fh:close())
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end
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end
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