src/process.h

   1 /* Definitions for asynchronous process control in GNU Emacs.
   2    Copyright (C) 1985, 1994, 2001-2012  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
   9 (at 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 #ifdef HAVE_SYS_TYPES_H
  20 #include <sys/types.h>
  21 #endif
  22
  23 #include <unistd.h>
  24
  25 #ifdef HAVE_GNUTLS
  26 #include "gnutls.h"
  27 #endif
  28
  29 /* This structure records information about a subprocess
  30    or network connection.
  31
  32    Every field in this structure except for the header
  33    must be a Lisp_Object, for GC's sake.  */
  34
  35 struct Lisp_Process
  36   {
  37     struct vectorlike_header header;
  38
  39     /* Name of subprocess terminal.  */
  40     Lisp_Object tty_name;
  41     /* Name of this process */
  42     Lisp_Object name;
  43     /* List of command arguments that this process was run with.
  44        Is set to t for a stopped network process; nil otherwise. */
  45     Lisp_Object command;
  46     /* (funcall FILTER PROC STRING)  (if FILTER is non-nil)
  47        to dispose of a bunch of chars from the process all at once */
  48     Lisp_Object filter;
  49     /* (funcall SENTINEL PROCESS) when process state changes */
  50     Lisp_Object sentinel;
  51     /* (funcall LOG SERVER CLIENT MESSAGE) when a server process
  52        accepts a connection from a client.  */
  53     Lisp_Object log;
  54     /* Buffer that output is going to */
  55     Lisp_Object buffer;
  56     /* t if this is a real child process.  For a network or serial
  57        connection, it is a plist based on the arguments to
  58        make-network-process or make-serial-process.  */
  59     Lisp_Object childp;
  60     /* Plist for programs to keep per-process state information, parameters, etc.  */
  61     Lisp_Object plist;
  62     /* Symbol indicating the type of process: real, network, serial  */
  63     Lisp_Object type;
  64     /* Marker set to end of last buffer-inserted output from this process */
  65     Lisp_Object mark;
  66     /* Symbol indicating status of process.
  67        This may be a symbol: run, open, or closed.
  68        Or it may be a list, whose car is stop, exit or signal
  69        and whose cdr is a pair (EXIT_CODE . COREDUMP_FLAG)
  70        or (SIGNAL_NUMBER . COREDUMP_FLAG).  */
  71     Lisp_Object status;
  72     /* Coding-system for decoding the input from this process.  */
  73     Lisp_Object decode_coding_system;
  74     /* Working buffer for decoding.  */
  75     Lisp_Object decoding_buf;
  76     /* Coding-system for encoding the output to this process.  */
  77     Lisp_Object encode_coding_system;
  78     /* Working buffer for encoding.  */
  79     Lisp_Object encoding_buf;
  80     /* Queue for storing waiting writes */
  81     Lisp_Object write_queue;
  82
  83 #ifdef HAVE_GNUTLS
  84     Lisp_Object gnutls_cred_type;
  85 #endif
  86
  87     /* After this point, there are no Lisp_Objects any more.  */
  88     /* alloc.c assumes that `pid' is the first such non-Lisp slot.  */
  89
  90     /* Number of this process.
  91        allocate_process assumes this is the first non-Lisp_Object field.
  92        A value 0 is used for pseudo-processes such as network or serial
  93        connections.  */
  94     pid_t pid;
  95     /* Descriptor by which we read from this process */
  96     int infd;
  97     /* Descriptor by which we write to this process */
  98     int outfd;
  99     /* Event-count of last event in which this process changed status.  */
 100     EMACS_INT tick;
 101     /* Event-count of last such event reported.  */
 102     EMACS_INT update_tick;
 103     /* Size of carryover in decoding.  */
 104     int decoding_carryover;
 105     /* Hysteresis to try to read process output in larger blocks.
 106        On some systems, e.g. GNU/Linux, Emacs is seen as
 107        an interactive app also when reading process output, meaning
 108        that process output can be read in as little as 1 byte at a
 109        time.  Value is nanoseconds to delay reading output from
 110        this process.  Range is 0 .. 50 * 1000 * 1000.  */
 111     int read_output_delay;
 112     /* Should we delay reading output from this process.
 113        Initialized from `Vprocess_adaptive_read_buffering'.
 114        0 = nil, 1 = t, 2 = other.  */
 115     unsigned int adaptive_read_buffering : 2;
 116     /* Skip reading this process on next read.  */
 117     unsigned int read_output_skip : 1;
 118     /* Non-nil means kill silently if Emacs is exited.
 119        This is the inverse of the `query-on-exit' flag.  */
 120     unsigned int kill_without_query : 1;
 121     /* Non-nil if communicating through a pty.  */
 122     unsigned int pty_flag : 1;
 123     /* Flag to set coding-system of the process buffer from the
 124        coding_system used to decode process output.  */
 125     unsigned int inherit_coding_system_flag : 1;
 126     /* Record the process status in the raw form in which it comes from `wait'.
 127        This is to avoid consing in a signal handler.  The `raw_status_new'
 128        flag indicates that `raw_status' contains a new status that still
 129        needs to be synced to `status'.  */
 130     unsigned int raw_status_new : 1;
 131     int raw_status;
 132
 133 #ifdef HAVE_GNUTLS
 134     gnutls_initstage_t gnutls_initstage;
 135     gnutls_session_t gnutls_state;
 136     gnutls_certificate_client_credentials gnutls_x509_cred;
 137     gnutls_anon_client_credentials_t gnutls_anon_cred;
 138     int gnutls_log_level;
 139     int gnutls_handshakes_tried;
 140     int gnutls_p;
 141 #endif
 142 };
 143
 144 /* Every field in the preceding structure except for the first two
 145    must be a Lisp_Object, for GC's sake.  */
 146
 147 #define ChannelMask(n) (1 << (n))
 148
 149 /* True if we are about to fork off a synchronous process or if we
 150    are waiting for it.  */
 151 extern int synch_process_alive;
 152
 153 /* Communicate exit status of sync process to from sigchld_handler
 154    to Fcall_process.  */
 155
 156 /* Nonzero => this is a string explaining death of synchronous subprocess.  */
 157 extern const char *synch_process_death;
 158
 159 /* Nonzero => this is the signal number that terminated the subprocess.  */
 160 extern int synch_process_termsig;
 161
 162 /* If synch_process_death is zero,
 163    this is exit code of synchronous subprocess.  */
 164 extern int synch_process_retcode;
 165
 166 /* The name of the file open to get a null file, or a data sink.
 167    MS-DOS, and OS/2 redefine this.  */
 168 #ifndef NULL_DEVICE
 169 #define NULL_DEVICE "/dev/null"
 170 #endif
 171
 172 /* Nonzero means don't run process sentinels.  This is used
 173    when exiting.  */
 174 extern int inhibit_sentinels;
 175
 176 extern Lisp_Object Qeuid, Qegid, Qcomm, Qstate, Qppid, Qpgrp, Qsess, Qttname;
 177 extern Lisp_Object Qminflt, Qmajflt, Qcminflt, Qcmajflt, Qutime, Qstime;
 178 extern Lisp_Object Qcutime, Qpri, Qnice, Qthcount, Qstart, Qvsize, Qrss, Qargs;
 179 extern Lisp_Object Quser, Qgroup, Qetime, Qpcpu, Qpmem, Qtpgid, Qcstime;
 180 extern Lisp_Object Qtime, Qctime;
 181 extern Lisp_Object QCspeed;
 182 extern Lisp_Object QCbytesize, QCstopbits, QCparity, Qodd, Qeven;
 183 extern Lisp_Object QCflowcontrol, Qhw, Qsw, QCsummary;
 184
 185 extern Lisp_Object list_system_processes (void);
 186 extern Lisp_Object system_process_attributes (Lisp_Object);
 187
 188 extern void hold_keyboard_input (void);
 189 extern void unhold_keyboard_input (void);
 190 extern int kbd_on_hold_p (void);
 191
 192 typedef void (*fd_callback)(int fd, void *data, int for_read);
 193
 194 extern void add_read_fd (int fd, fd_callback func, void *data);
 195 extern void delete_read_fd (int fd);
 196 extern void add_write_fd (int fd, fd_callback func, void *data);
 197 extern void delete_write_fd (int fd);