1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
/*
** Copyright (C) 2020-2025 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
**
** This program is free software; you can redistribute it and/or modify it
** under the terms of the GNU General Public License as published by the
** Free Software Foundation; either version 3, or (at your option) any
** later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software Foundation,
** Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
**
*/
#include "config.h"
#include <string>
#include <algorithm>
#include <atomic>
#include <cstdio>
#include <unistd.h>
#include "mu-cmd.hh"
#include "mu-server.hh"
#if BUILD_SCM
#include "scm/mu-scm.hh"
#endif/*BUILD_SCM*/
#include "utils/mu-utils.hh"
#include "utils/mu-readline.hh"
using namespace Mu;
static std::atomic<int> MuTerminate{0};
static bool tty;
static void
sig_handler(int sig)
{
MuTerminate = sig;
}
static void
install_sig_handler()
{
MuTerminate = 0;
struct sigaction action{};
action.sa_handler = sig_handler;
sigemptyset(&action.sa_mask);
action.sa_flags = SA_RESETHAND;
for (auto sig: {SIGINT, SIGHUP, SIGTERM, SIGPIPE})
if (sigaction(sig, &action, NULL) != 0)
mu_critical("set sigaction for {} failed: {}",
sig, g_strerror(errno));
}
/*
* djcb@djcbsoftware.nl
*
* Markers for/after the length cookie that precedes the expression we write to
* output. We use octal 376, 377 (ie, 0xfe, 0xff) as they will never occur in
* utf8
*/
#define COOKIE_PRE "\376"
#define COOKIE_POST "\377"
static void
cookie(size_t n)
{
const auto num{static_cast<unsigned>(n)};
if (tty) // for testing.
::printf("[%x]", num);
else
::printf(COOKIE_PRE "%x" COOKIE_POST, num);
}
static void
output_stdout(const std::string& str, Server::OutputFlags flags)
{
cookie(str.size() + 1);
if (G_UNLIKELY(::puts(str.c_str()) < 0)) {
mu_critical("failed to write output '{}'", str);
::raise(SIGTERM); /* terminate ourselves */
}
if (any_of(flags & Server::OutputFlags::Flush))
std::fflush(stdout);
}
static void
report_error(const Mu::Error& err) noexcept
{
output_stdout(Sexp(":error"_sym, Error::error_number(err.code()),
":message"_sym, err.what()).to_string(),
Server::OutputFlags::Flush);
}
static void
maybe_setup_readline(const Mu::Options& opts)
{
tty = ::isatty(::fileno(stdout));
// Note, the readline stuff is inactive unless on a tty.
const auto histpath{opts.runtime_path(RuntimePath::Cache) + "/history"};
setup_readline(histpath, 50);
}
// get the SCM socket path we're listening on, or empty if not listening
static std::string
maybe_listen_path(const Mu::Store& store, const Mu::Options& opts)
{
#ifdef BUILD_SCM
if (!opts.scm.socket_path)
return {};
const auto socket_path{*opts.scm.socket_path};
const auto res = Mu::Scm::run_repl(store, opts, socket_path);
if (!res) {
mu_warning("failed to start scm socket: {}", res.error().what());
return {};
} else
return socket_path;
#endif /*BUILD_SCM*/
return {};
}
static bool
maybe_eval(Server& server, const Mu::Options& opts)
{
const auto eval = std::string{opts.server.commands ?
"(help :full t)" : opts.server.eval};
if (!eval.empty()) {
server.invoke(eval);
return true;
} else
return false;
}
Result<void>
Mu::mu_cmd_server(const Mu::Options& opts) try {
auto store = Store::make(opts.runtime_path(RuntimePath::XapianDb),
Store::Options::Writable);
if (!store)
return Err(store.error());
// empty when we're not listening
const auto socket_path = maybe_listen_path(*store, opts);
Server::Options sopts{opts.server.allow_temp_file, socket_path};
Server server{*store, sopts, output_stdout};
if (maybe_eval(server, opts))
return Ok();
maybe_setup_readline(opts);
install_sig_handler();
mu_println(";; Welcome to the " PACKAGE_STRING " command-server{}",
opts.debug ? " (debug-mode)" : "");
if (!socket_path.empty())
mu_println(";; SCM socket listening on {}", socket_path);
mu_println(";; Use (help) to get a list of commands, (quit) to quit.");
bool do_quit{};
while (!MuTerminate && !do_quit) {
std::fflush(stdout); // Needed for Windows, see issue #1827.
const auto line{read_line(do_quit)};
if (line.find_first_not_of(" \t") == std::string::npos)
continue; // skip whitespace-only lines
do_quit = server.invoke(line) ? false : true;
save_line(line);
}
if (MuTerminate != 0)
mu_message ("shutting down due to signal {}", MuTerminate.load());
shutdown_readline();
return Ok();
} catch (const Error& er) { /* note: user-level error, "OK" for mu */
report_error(er);
mu_warning("server caught exception: {}", er.what());
return Ok();
} catch (...) {
mu_critical("server caught exception");
return Err(Error::Code::Internal, "caught exception");
}
|
