mirror of
https://github.com/fish-shell/fish-shell
synced 2024-12-26 04:43:10 +00:00
483 lines
8.4 KiB
C
483 lines
8.4 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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/**
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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;
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/**
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Set to 1 after initialization has been performed
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*/
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static int init = 0;
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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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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)( int 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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/**
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Get a socket for reading from the server
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*/
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static int get_socket( int fork_ok )
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{
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int s, len;
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struct sockaddr_un local;
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char *name;
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wchar_t *wdir;
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wchar_t *wuname;
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char *dir =0, *uname=0;
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get_socket_count++;
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wdir = path;
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wuname = user;
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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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if( wuname )
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uname = wcs2str(wuname );
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else
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{
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struct passwd *pw;
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pw = getpwuid( getuid() );
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uname = strdup( pw->pw_name );
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}
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name = malloc( strlen(dir) +
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strlen(uname) +
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strlen(SOCK_FILENAME) +
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2 );
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strcpy( name, dir );
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strcat( name, "/" );
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strcat( name, SOCK_FILENAME );
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strcat( name, uname );
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free( dir );
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free( uname );
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debug( 3, L"Connect to socket %s at fd %2", name, s );
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local.sun_family = AF_UNIX;
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strcpy(local.sun_path, name );
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free( name );
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len = sizeof(local);
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if( connect( s, (struct sockaddr *)&local, len) == -1 )
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{
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close( s );
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if( fork_ok && 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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return get_socket( 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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if( (fcntl( s, F_SETFL, O_NONBLOCK ) != 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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Callback function used whenever a new fishd message is recieved
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*/
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static void callback( int 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()
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{
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if( !init )
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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.used=0;
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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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array_list_t lst;
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int i;
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al_init( &lst );
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env_universal_common_get_names( &lst,
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1,
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1 );
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for( i=0; i<al_get_count( &lst ); i++ )
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{
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wchar_t *key = (wchar_t *)al_get( &lst, i );
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env_universal_common_remove( key );
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}
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al_destroy( &lst );
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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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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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init = 0;
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env_universal_server.buffer_consumed = env_universal_server.buffer_used = 0;
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env_universal_server.fd = get_socket(1);
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init = 1;
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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)( int type, const wchar_t *name, const wchar_t *val ))
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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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connection_init( &env_universal_server, -1 );
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env_universal_server.fd = get_socket(1);
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env_universal_common_init( &callback );
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env_universal_read_all();
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init = 1;
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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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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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env_universal_common_destroy();
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init = 0;
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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( !init)
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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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wchar_t *env_universal_get( const wchar_t *name )
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{
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if( !init)
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return 0;
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CHECK( name, 0 );
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return env_universal_common_get( name );
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}
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int env_universal_get_export( const wchar_t *name )
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{
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if( !init)
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return 0;
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CHECK( name, 0 );
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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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message_t *msg;
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fd_set fds;
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if( !init || 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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q_put( &env_universal_server.unsent, 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( q_empty( &env_universal_server.unsent ) )
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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 wchar_t *name, const wchar_t *value, int export )
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{
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message_t *msg;
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if( !init )
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return;
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CHECK( name, );
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debug( 3, L"env_universal_set( \"%ls\", \"%ls\" )", name, value );
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if( is_dead() )
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{
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env_universal_common_set( name, value, export );
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}
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else
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{
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msg = create_message( export?SET_EXPORT:SET,
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name,
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value);
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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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q_put( &env_universal_server.unsent, 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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message_t *msg;
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if( !init )
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return 1;
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CHECK( name, 1 );
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res = !env_universal_common_get( name );
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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( is_dead() )
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{
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env_universal_common_remove( name );
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}
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else
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{
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msg= create_message( ERASE, name, 0);
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msg->count=1;
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q_put( &env_universal_server.unsent, 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( array_list_t *l,
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int show_exported,
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int show_unexported )
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{
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if( !init )
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return;
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CHECK( l, );
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env_universal_common_get_names( l,
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show_exported,
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show_unexported );
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}
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