mirror of
https://github.com/fish-shell/fish-shell.git
synced 2024-11-27 19:53:36 +08:00
9ae06c541f
The inotify notifier is fragile, fails on travis, and fails to compile on certain Linux kernels. It doesn't appear to work as well as the named pipe mechanism. Best to just get rid of it.
523 lines
11 KiB
C++
523 lines
11 KiB
C++
#include "config.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <wchar.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <pwd.h>
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#include <errno.h>
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#include <fcntl.h>
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#if HAVE_NCURSES_H
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#include <ncurses.h>
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#else
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#include <curses.h>
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#endif
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#if HAVE_TERM_H
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#include <term.h>
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#elif HAVE_NCURSES_TERM_H
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#include <ncurses/term.h>
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#endif
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#ifdef HAVE_SYS_SELECT_H
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#include <sys/select.h>
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#endif
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#include <signal.h>
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#include "fallback.h"
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#include "util.h"
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#include "common.h"
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#include "wutil.h"
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#include "env_universal_common.h"
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#include "env_universal.h"
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#include "env.h"
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/**
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Maximum number of times to try to get a new fishd socket
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*/
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#define RECONNECT_COUNT 32
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connection_t env_universal_server(-1);
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/**
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Set to true after initialization has been performed
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*/
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static bool s_env_univeral_inited = false;
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/**
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The number of attempts to start fishd
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*/
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static int get_socket_count = 0;
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#define DEFAULT_RETRY_COUNT 15
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#define DEFAULT_RETRY_DELAY 0.2
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static wchar_t * path;
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static wchar_t *user;
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static void (*start_fishd)();
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static void (*external_callback)(fish_message_type_t type, const wchar_t *name, const wchar_t *val);
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/**
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Flag set to 1 when a barrier reply is recieved
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*/
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static int barrier_reply = 0;
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void env_universal_barrier();
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static int is_dead()
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{
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return env_universal_server.fd < 0;
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}
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static int try_get_socket_once(void)
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{
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int s;
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wchar_t *wdir;
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wchar_t *wuname;
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char *dir = 0;
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wdir = path;
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wuname = user;
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uid_t seuid;
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gid_t segid;
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if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
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{
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wperror(L"socket");
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return -1;
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}
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if (wdir)
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dir = wcs2str(wdir);
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else
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dir = strdup("/tmp");
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std::string uname;
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if (wuname)
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{
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uname = wcs2string(wuname);
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}
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else
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{
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struct passwd *pw = getpwuid(getuid());
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if (pw && pw->pw_name)
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{
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uname = pw->pw_name;
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}
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}
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std::string name;
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name.reserve(strlen(dir) + uname.size() + strlen(SOCK_FILENAME) + 2);
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name.append(dir);
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name.append("/");
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name.append(SOCK_FILENAME);
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name.append(uname);
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free(dir);
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debug(3, L"Connect to socket %s at fd %d", name.c_str(), s);
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struct sockaddr_un local = {};
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local.sun_family = AF_UNIX;
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strncpy(local.sun_path, name.c_str(), (sizeof local.sun_path) - 1);
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if (connect(s, (struct sockaddr *)&local, sizeof local) == -1)
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{
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close(s);
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/* If it fails on first try, it's probably no serious error, but fishd hasn't been launched yet.
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This happens (at least) on the first concurrent session. */
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if (get_socket_count > 1)
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wperror(L"connect");
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return -1;
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}
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if ((getpeereid(s, &seuid, &segid) != 0) || seuid != geteuid())
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{
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debug(1, L"Wrong credentials for socket %s at fd %d", name.c_str(), s);
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close(s);
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return -1;
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}
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if ((make_fd_nonblocking(s) != 0) || (fcntl(s, F_SETFD, FD_CLOEXEC) != 0))
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{
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wperror(L"fcntl");
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close(s);
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return -1;
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}
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debug(3, L"Connected to fd %d", s);
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return s;
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}
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/**
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Get a socket for reading from the server
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*/
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static int get_socket(void)
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{
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get_socket_count++;
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int s = try_get_socket_once();
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if (s < 0)
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{
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if (start_fishd)
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{
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debug(2, L"Could not connect to socket %d, starting fishd", s);
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start_fishd();
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for (size_t i=0; s < 0 && i < DEFAULT_RETRY_COUNT; i++)
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{
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if (i > 0)
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{
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// Wait before next try
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usleep((useconds_t)(DEFAULT_RETRY_DELAY * 1E6));
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}
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s = try_get_socket_once();
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}
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}
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}
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if (s < 0)
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{
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debug(1, L"Could not connect to universal variable server, already tried manual restart (or no command supplied). You will not be able to share variable values between fish sessions. Is fish properly installed?");
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return -1;
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}
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return s;
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}
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/**
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Callback function used whenever a new fishd message is recieved
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*/
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static void callback(fish_message_type_t type, const wchar_t *name, const wchar_t *val)
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{
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if (type == BARRIER_REPLY)
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{
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barrier_reply = 1;
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}
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else
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{
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if (external_callback)
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external_callback(type, name, val);
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}
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}
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/**
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Make sure the connection is healthy. If not, close it, and try to
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establish a new connection.
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*/
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static void check_connection(void)
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{
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if (! s_env_univeral_inited)
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return;
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if (env_universal_server.killme)
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{
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debug(3, L"Lost connection to universal variable server.");
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if (close(env_universal_server.fd))
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{
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wperror(L"close");
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}
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env_universal_server.fd = -1;
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env_universal_server.killme=0;
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env_universal_server.input.clear();
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env_universal_read_all();
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}
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}
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/**
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Remove all universal variables.
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*/
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static void env_universal_remove_all()
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{
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size_t i;
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wcstring_list_t lst;
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env_universal_common_get_names(lst, true, true);
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for (i=0; i<lst.size(); i++)
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{
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const wcstring &key = lst.at(i);
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env_universal_common_remove(key);
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}
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}
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/**
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Try to establish a new connection to fishd. If successfull, end
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with call to env_universal_barrier(), to make sure everything is in
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sync.
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*/
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static void reconnect()
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{
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assert(synchronizes_via_fishd());
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if (get_socket_count >= RECONNECT_COUNT)
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return;
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debug(3, L"Get new fishd connection");
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s_env_univeral_inited = false;
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env_universal_server.buffer_consumed = 0;
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env_universal_server.read_buffer.clear();
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env_universal_server.fd = get_socket();
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s_env_univeral_inited = true;
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if (env_universal_server.fd >= 0)
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{
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env_universal_remove_all();
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env_universal_barrier();
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}
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}
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void env_universal_init(wchar_t * p,
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wchar_t *u,
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void (*sf)(),
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void (*cb)(fish_message_type_t type, const wchar_t *name, const wchar_t *val))
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{
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if (! synchronizes_via_fishd())
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{
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external_callback = cb;
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env_universal_common_init(&callback);
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s_env_univeral_inited = true;
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}
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else
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{
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path=p;
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user=u;
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start_fishd=sf;
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external_callback = cb;
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env_universal_server.fd = get_socket();
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env_universal_common_init(&callback);
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env_universal_read_all();
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s_env_univeral_inited = true;
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if (env_universal_server.fd >= 0)
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{
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env_universal_barrier();
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}
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}
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}
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void env_universal_destroy()
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{
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/*
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Go into blocking mode and send all data before exiting
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*/
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if (env_universal_server.fd >= 0)
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{
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if (fcntl(env_universal_server.fd, F_SETFL, 0) != 0)
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{
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wperror(L"fcntl");
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}
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try_send_all(&env_universal_server);
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}
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connection_destroy(&env_universal_server);
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env_universal_server.fd =-1;
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s_env_univeral_inited = false;
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}
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/**
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Read all available messages from the server.
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*/
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int env_universal_read_all()
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{
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if (! s_env_univeral_inited)
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return 0;
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if (env_universal_server.fd == -1)
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{
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reconnect();
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if (env_universal_server.fd == -1)
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return 0;
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}
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if (env_universal_server.fd != -1)
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{
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read_message(&env_universal_server);
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check_connection();
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return 1;
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}
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else
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{
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debug(2, L"No connection to universal variable server");
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return 0;
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}
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}
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env_var_t env_universal_get(const wcstring &name)
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{
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if (!s_env_univeral_inited)
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return env_var_t::missing_var();
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return env_universal_common_get(name);
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}
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bool env_universal_get_export(const wcstring &name)
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{
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if (!s_env_univeral_inited)
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return false;
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return env_universal_common_get_export(name);
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}
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void env_universal_barrier()
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{
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ASSERT_IS_MAIN_THREAD();
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UNIVERSAL_LOG("BARRIER");
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message_t *msg;
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fd_set fds;
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if (! synchronizes_via_fishd())
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{
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env_universal_common_sync();
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return;
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}
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if (!s_env_univeral_inited || is_dead())
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return;
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barrier_reply = 0;
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/*
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Create barrier request
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*/
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msg= create_message(BARRIER, 0, 0);
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msg->count=1;
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env_universal_server.unsent.push(msg);
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/*
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Wait until barrier request has been sent
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*/
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debug(3, L"Create barrier");
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while (1)
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{
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try_send_all(&env_universal_server);
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check_connection();
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if (env_universal_server.unsent.empty())
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break;
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if (env_universal_server.fd == -1)
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{
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reconnect();
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debug(2, L"barrier interrupted, exiting");
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return;
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}
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FD_ZERO(&fds);
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FD_SET(env_universal_server.fd, &fds);
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select(env_universal_server.fd+1, 0, &fds, 0, 0);
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}
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/*
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Wait for barrier reply
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*/
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debug(3, L"Sent barrier request");
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while (!barrier_reply)
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{
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if (env_universal_server.fd == -1)
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{
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reconnect();
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debug(2, L"barrier interrupted, exiting (2)");
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return;
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}
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FD_ZERO(&fds);
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FD_SET(env_universal_server.fd, &fds);
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select(env_universal_server.fd+1, &fds, 0, 0, 0);
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env_universal_read_all();
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}
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debug(3, L"End barrier");
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}
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void env_universal_set(const wcstring &name, const wcstring &value, bool exportv)
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{
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if (!s_env_univeral_inited)
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return;
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debug(3, L"env_universal_set( \"%ls\", \"%ls\" )", name.c_str(), value.c_str());
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if (! synchronizes_via_fishd() || is_dead())
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{
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env_universal_common_set(name.c_str(), value.c_str(), exportv);
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env_universal_barrier();
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}
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else
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{
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message_t *msg = create_message(exportv?SET_EXPORT:SET,
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name.c_str(),
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value.c_str());
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if (!msg)
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{
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debug(1, L"Could not create universal variable message");
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return;
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}
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msg->count=1;
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env_universal_server.unsent.push(msg);
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env_universal_barrier();
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}
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}
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int env_universal_remove(const wchar_t *name)
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{
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int res;
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if (!s_env_univeral_inited)
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return 1;
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CHECK(name, 1);
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wcstring name_str = name;
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res = env_universal_common_get(name_str).missing();
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debug(3,
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L"env_universal_remove( \"%ls\" )",
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name);
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if (! synchronizes_via_fishd() || is_dead())
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{
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env_universal_common_remove(name_str);
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}
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else
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{
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message_t *msg = create_message(ERASE, name, 0);
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msg->count=1;
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env_universal_server.unsent.push(msg);
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env_universal_barrier();
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}
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return res;
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}
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void env_universal_get_names(wcstring_list_t &lst,
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bool show_exported,
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bool show_unexported)
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{
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if (!s_env_univeral_inited)
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return;
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env_universal_common_get_names(lst,
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show_exported,
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show_unexported);
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}
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