src/process.h

   1 /* Definitions for asynchronous process control in GNU Emacs.
   2    Copyright (C) 1985, 1994, 2001-2016 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software: you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation, either version 3 of the License, or (at
   9 your option) any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef EMACS_PROCESS_H
  20 #define EMACS_PROCESS_H
  21
  22 #ifdef HAVE_SYS_TYPES_H
  23 #include <sys/types.h>
  24 #endif
  25
  26 #include <unistd.h>
  27
  28 #ifdef HAVE_GNUTLS
  29 #include "gnutls.h"
  30 #endif
  31
  32 INLINE_HEADER_BEGIN
  33
  34 /* Bound on number of file descriptors opened on behalf of a process,
  35    that need to be closed.  */
  36
  37 enum { PROCESS_OPEN_FDS = 6 };
  38
  39 /* This structure records information about a subprocess
  40    or network connection.  */
  41
  42 struct Lisp_Process
  43   {
  44     struct vectorlike_header header;
  45
  46     /* Name of subprocess terminal.  */
  47     Lisp_Object tty_name;
  48
  49     /* Name of this process.  */
  50     Lisp_Object name;
  51
  52     /* List of command arguments that this process was run with.
  53        Is set to t for a stopped network process; nil otherwise.  */
  54     Lisp_Object command;
  55
  56     /* (funcall FILTER PROC STRING)  (if FILTER is non-nil)
  57        to dispose of a bunch of chars from the process all at once.  */
  58     Lisp_Object filter;
  59
  60     /* (funcall SENTINEL PROCESS) when process state changes.  */
  61     Lisp_Object sentinel;
  62
  63     /* (funcall LOG SERVER CLIENT MESSAGE) when a server process
  64        accepts a connection from a client.  */
  65     Lisp_Object log;
  66
  67     /* Buffer that output is going to.  */
  68     Lisp_Object buffer;
  69
  70     /* t if this is a real child process.  For a network or serial
  71        connection, it is a plist based on the arguments to
  72        make-network-process or make-serial-process.  */
  73
  74     Lisp_Object childp;
  75
  76     /* Plist for programs to keep per-process state information, parameters, etc.  */
  77     Lisp_Object plist;
  78
  79     /* Symbol indicating the type of process: real, network, serial.  */
  80     Lisp_Object type;
  81
  82     /* Marker set to end of last buffer-inserted output from this process.  */
  83     Lisp_Object mark;
  84
  85     /* Symbol indicating status of process.
  86        This may be a symbol: run, open, closed, listen, or failed.
  87        Or it may be a pair (connect . ADDRINFOS) where ADDRINFOS is
  88        a list of remaining (PROTOCOL . ADDRINFO) pairs to try.
  89        Or it may be (failed ERR) where ERR is an integer, string or symbol.
  90        Or it may be a list, whose car is stop, exit or signal
  91        and whose cdr is a pair (EXIT_CODE . COREDUMP_FLAG)
  92        or (SIGNAL_NUMBER . COREDUMP_FLAG).  */
  93     Lisp_Object status;
  94
  95     /* Coding-system for decoding the input from this process.  */
  96     Lisp_Object decode_coding_system;
  97
  98     /* Working buffer for decoding.  */
  99     Lisp_Object decoding_buf;
 100
 101     /* Coding-system for encoding the output to this process.  */
 102     Lisp_Object encode_coding_system;
 103
 104     /* Working buffer for encoding.  */
 105     Lisp_Object encoding_buf;
 106
 107     /* Queue for storing waiting writes.  */
 108     Lisp_Object write_queue;
 109
 110 #ifdef HAVE_GNUTLS
 111     Lisp_Object gnutls_cred_type;
 112     Lisp_Object gnutls_boot_parameters;
 113 #endif
 114
 115     /* Pipe process attached to the standard error of this process.  */
 116     Lisp_Object stderrproc;
 117
 118     /* After this point, there are no Lisp_Objects any more.  */
 119     /* alloc.c assumes that `pid' is the first such non-Lisp slot.  */
 120
 121     /* Process ID.  A positive value is a child process ID.
 122        Zero is for pseudo-processes such as network or serial connections,
 123        or for processes that have not been fully created yet.
 124        -1 is for a process that was not created successfully.
 125        -2 is for a pty with no process, e.g., for GDB.  */
 126     pid_t pid;
 127     /* Descriptor by which we read from this process.  */
 128     int infd;
 129     /* Descriptor by which we write to this process.  */
 130     int outfd;
 131     /* Descriptors that were created for this process and that need
 132        closing.  Unused entries are negative.  */
 133     int open_fd[PROCESS_OPEN_FDS];
 134     /* Event-count of last event in which this process changed status.  */
 135     EMACS_INT tick;
 136     /* Event-count of last such event reported.  */
 137     EMACS_INT update_tick;
 138     /* Size of carryover in decoding.  */
 139     int decoding_carryover;
 140     /* Hysteresis to try to read process output in larger blocks.
 141        On some systems, e.g. GNU/Linux, Emacs is seen as
 142        an interactive app also when reading process output, meaning
 143        that process output can be read in as little as 1 byte at a
 144        time.  Value is nanoseconds to delay reading output from
 145        this process.  Range is 0 .. 50 * 1000 * 1000.  */
 146     int read_output_delay;
 147     /* Should we delay reading output from this process.
 148        Initialized from `Vprocess_adaptive_read_buffering'.
 149        0 = nil, 1 = t, 2 = other.  */
 150     unsigned int adaptive_read_buffering : 2;
 151     /* Skip reading this process on next read.  */
 152     bool_bf read_output_skip : 1;
 153     /* True means kill silently if Emacs is exited.
 154        This is the inverse of the `query-on-exit' flag.  */
 155     bool_bf kill_without_query : 1;
 156     /* True if communicating through a pty.  */
 157     bool_bf pty_flag : 1;
 158     /* Flag to set coding-system of the process buffer from the
 159        coding_system used to decode process output.  */
 160     bool_bf inherit_coding_system_flag : 1;
 161     /* Whether the process is alive, i.e., can be waited for.  Running
 162        processes can be waited for, but exited and fake processes cannot.  */
 163     bool_bf alive : 1;
 164     /* Record the process status in the raw form in which it comes from `wait'.
 165        This is to avoid consing in a signal handler.  The `raw_status_new'
 166        flag indicates that `raw_status' contains a new status that still
 167        needs to be synced to `status'.  */
 168     bool_bf raw_status_new : 1;
 169     /* Whether this is a nonblocking socket. */
 170     bool_bf is_non_blocking_client : 1;
 171     /* Whether this is a server or a client socket. */
 172     bool_bf is_server : 1;
 173     int raw_status;
 174     /* The length of the socket backlog. */
 175     int backlog;
 176     /* The port number. */
 177     int port;
 178     /* The socket type. */
 179     int socktype;
 180
 181 #ifdef HAVE_GETADDRINFO_A
 182     /* Whether the socket is waiting for response from an asynchronous
 183        DNS call. */
 184     struct gaicb *dns_request;
 185 #endif
 186
 187 #ifdef HAVE_GNUTLS
 188     gnutls_initstage_t gnutls_initstage;
 189     gnutls_session_t gnutls_state;
 190     gnutls_certificate_client_credentials gnutls_x509_cred;
 191     gnutls_anon_client_credentials_t gnutls_anon_cred;
 192     gnutls_x509_crt_t gnutls_certificate;
 193     unsigned int gnutls_peer_verification;
 194     unsigned int gnutls_extra_peer_verification;
 195     int gnutls_log_level;
 196     int gnutls_handshakes_tried;
 197     bool_bf gnutls_p : 1;
 198     bool_bf gnutls_complete_negotiation_p : 1;
 199 #endif
 200 };
 201
 202 /* Every field in the preceding structure except for the first two
 203    must be a Lisp_Object, for GC's sake.  */
 204
 205 #define ChannelMask(n) (1 << (n))
 206
 207 /* Most code should use these functions to set Lisp fields in struct
 208    process.  */
 209
 210 INLINE void
 211 pset_childp (struct Lisp_Process *p, Lisp_Object val)
 212 {
 213   p->childp = val;
 214 }
 215
 216 INLINE void
 217 pset_status (struct Lisp_Process *p, Lisp_Object val)
 218 {
 219   p->status = val;
 220 }
 221
 222 #ifdef HAVE_GNUTLS
 223 INLINE void
 224 pset_gnutls_cred_type (struct Lisp_Process *p, Lisp_Object val)
 225 {
 226   p->gnutls_cred_type = val;
 227 }
 228 #endif
 229
 230 /* True means don't run process sentinels.  This is used
 231    when exiting.  */
 232 extern bool inhibit_sentinels;
 233
 234 /* Exit statuses for GNU programs that exec other programs.  */
 235 enum
 236 {
 237   EXIT_CANCELED = 125, /* Internal error prior to exec attempt.  */
 238   EXIT_CANNOT_INVOKE = 126, /* Program located, but not usable.  */
 239   EXIT_ENOENT = 127 /* Could not find program to exec.  */
 240 };
 241
 242 /* Defined in callproc.c.  */
 243
 244 extern Lisp_Object encode_current_directory (void);
 245 extern void record_kill_process (struct Lisp_Process *, Lisp_Object);
 246
 247 /* Defined in sysdep.c.  */
 248
 249 extern Lisp_Object list_system_processes (void);
 250 extern Lisp_Object system_process_attributes (Lisp_Object);
 251
 252 /* Defined in process.c.  */
 253
 254 extern void record_deleted_pid (pid_t, Lisp_Object);
 255 struct sockaddr;
 256 extern Lisp_Object conv_sockaddr_to_lisp (struct sockaddr *, ptrdiff_t);
 257 extern void hold_keyboard_input (void);
 258 extern void unhold_keyboard_input (void);
 259 extern bool kbd_on_hold_p (void);
 260
 261 typedef void (*fd_callback) (int fd, void *data);
 262
 263 extern void add_read_fd (int fd, fd_callback func, void *data);
 264 extern void delete_read_fd (int fd);
 265 extern void add_write_fd (int fd, fd_callback func, void *data);
 266 extern void delete_write_fd (int fd);
 267 extern void catch_child_signal (void);
 268
 269 #ifdef WINDOWSNT
 270 extern Lisp_Object network_interface_list (void);
 271 extern Lisp_Object network_interface_info (Lisp_Object);
 272 #endif
 273
 274 extern Lisp_Object remove_slash_colon (Lisp_Object);
 275
 276 INLINE_HEADER_END
 277
 278 #endif /* EMACS_PROCESS_H */