src/process.h

   1 /* Definitions for asynchronous process control in GNU Emacs.
   2    Copyright (C) 1985, 1994, 2001-2013 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 INLINE_HEADER_BEGIN
  30 #ifndef PROCESS_INLINE
  31 # define PROCESS_INLINE INLINE
  32 #endif
  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, or closed.
  87        Or it may be a list, whose car is stop, exit or signal
  88        and whose cdr is a pair (EXIT_CODE . COREDUMP_FLAG)
  89        or (SIGNAL_NUMBER . COREDUMP_FLAG).  */
  90     Lisp_Object status;
  91
  92     /* Coding-system for decoding the input from this process.  */
  93     Lisp_Object decode_coding_system;
  94
  95     /* Working buffer for decoding.  */
  96     Lisp_Object decoding_buf;
  97
  98     /* Coding-system for encoding the output to this process.  */
  99     Lisp_Object encode_coding_system;
 100
 101     /* Working buffer for encoding.  */
 102     Lisp_Object encoding_buf;
 103
 104     /* Queue for storing waiting writes */
 105     Lisp_Object write_queue;
 106
 107 #ifdef HAVE_GNUTLS
 108     Lisp_Object gnutls_cred_type;
 109 #endif
 110
 111     /* The thread a process is linked to, or nil for any thread.  */
 112     Lisp_Object thread;
 113
 114     /* After this point, there are no Lisp_Objects any more.  */
 115     /* alloc.c assumes that `pid' is the first such non-Lisp slot.  */
 116
 117     /* Number of this process.
 118        allocate_process assumes this is the first non-Lisp_Object field.
 119        A value 0 is used for pseudo-processes such as network or serial
 120        connections.  */
 121     pid_t pid;
 122     /* Descriptor by which we read from this process */
 123     int infd;
 124     /* Descriptor by which we write to this process */
 125     int outfd;
 126     /* Descriptors that were created for this process and that need
 127        closing.  Unused entries are negative.  */
 128     int open_fd[PROCESS_OPEN_FDS];
 129     /* Event-count of last event in which this process changed status.  */
 130     EMACS_INT tick;
 131     /* Event-count of last such event reported.  */
 132     EMACS_INT update_tick;
 133     /* Size of carryover in decoding.  */
 134     int decoding_carryover;
 135     /* Hysteresis to try to read process output in larger blocks.
 136        On some systems, e.g. GNU/Linux, Emacs is seen as
 137        an interactive app also when reading process output, meaning
 138        that process output can be read in as little as 1 byte at a
 139        time.  Value is nanoseconds to delay reading output from
 140        this process.  Range is 0 .. 50 * 1000 * 1000.  */
 141     int read_output_delay;
 142     /* Should we delay reading output from this process.
 143        Initialized from `Vprocess_adaptive_read_buffering'.
 144        0 = nil, 1 = t, 2 = other.  */
 145     unsigned int adaptive_read_buffering : 2;
 146     /* Skip reading this process on next read.  */
 147     unsigned int read_output_skip : 1;
 148     /* Non-nil means kill silently if Emacs is exited.
 149        This is the inverse of the `query-on-exit' flag.  */
 150     unsigned int kill_without_query : 1;
 151     /* Non-nil if communicating through a pty.  */
 152     unsigned int pty_flag : 1;
 153     /* Flag to set coding-system of the process buffer from the
 154        coding_system used to decode process output.  */
 155     unsigned int inherit_coding_system_flag : 1;
 156     /* Whether the process is alive, i.e., can be waited for.  Running
 157        processes can be waited for, but exited and fake processes cannot.  */
 158     unsigned int alive : 1;
 159     /* Record the process status in the raw form in which it comes from `wait'.
 160        This is to avoid consing in a signal handler.  The `raw_status_new'
 161        flag indicates that `raw_status' contains a new status that still
 162        needs to be synced to `status'.  */
 163     unsigned int raw_status_new : 1;
 164     int raw_status;
 165
 166 #ifdef HAVE_GNUTLS
 167     gnutls_initstage_t gnutls_initstage;
 168     gnutls_session_t gnutls_state;
 169     gnutls_certificate_client_credentials gnutls_x509_cred;
 170     gnutls_anon_client_credentials_t gnutls_anon_cred;
 171     int gnutls_log_level;
 172     int gnutls_handshakes_tried;
 173     unsigned int gnutls_p : 1;
 174 #endif
 175 };
 176
 177 /* Every field in the preceding structure except for the first two
 178    must be a Lisp_Object, for GC's sake.  */
 179
 180 #define ChannelMask(n) (1 << (n))
 181
 182 /* Most code should use these functions to set Lisp fields in struct
 183    process.  */
 184
 185 PROCESS_INLINE void
 186 pset_childp (struct Lisp_Process *p, Lisp_Object val)
 187 {
 188   p->childp = val;
 189 }
 190
 191 #ifdef HAVE_GNUTLS
 192 PROCESS_INLINE void
 193 pset_gnutls_cred_type (struct Lisp_Process *p, Lisp_Object val)
 194 {
 195   p->gnutls_cred_type = val;
 196 }
 197 #endif
 198
 199 /* True means don't run process sentinels.  This is used
 200    when exiting.  */
 201 extern bool inhibit_sentinels;
 202
 203 extern Lisp_Object Qeuid, Qegid, Qcomm, Qstate, Qppid, Qpgrp, Qsess, Qttname;
 204 extern Lisp_Object Qminflt, Qmajflt, Qcminflt, Qcmajflt, Qutime, Qstime;
 205 extern Lisp_Object Qcutime, Qpri, Qnice, Qthcount, Qstart, Qvsize, Qrss, Qargs;
 206 extern Lisp_Object Quser, Qgroup, Qetime, Qpcpu, Qpmem, Qtpgid, Qcstime;
 207 extern Lisp_Object Qtime, Qctime;
 208 extern Lisp_Object QCspeed;
 209 extern Lisp_Object QCbytesize, QCstopbits, QCparity, Qodd, Qeven;
 210 extern Lisp_Object QCflowcontrol, Qhw, Qsw, QCsummary;
 211
 212 /* Exit statuses for GNU programs that exec other programs.  */
 213 enum
 214 {
 215   EXIT_CANCELED = 125, /* Internal error prior to exec attempt.  */
 216   EXIT_CANNOT_INVOKE = 126, /* Program located, but not usable.  */
 217   EXIT_ENOENT = 127 /* Could not find program to exec.  */
 218 };
 219
 220 /* Defined in callproc.c.  */
 221
 222 extern void block_child_signal (void);
 223 extern void unblock_child_signal (void);
 224 extern Lisp_Object encode_current_directory (void);
 225 extern void record_kill_process (struct Lisp_Process *, Lisp_Object);
 226
 227 /* Defined in sysdep.c.  */
 228
 229 extern Lisp_Object list_system_processes (void);
 230 extern Lisp_Object system_process_attributes (Lisp_Object);
 231
 232 /* Defined in process.c.  */
 233
 234 extern void record_deleted_pid (pid_t, Lisp_Object);
 235 extern void hold_keyboard_input (void);
 236 extern void unhold_keyboard_input (void);
 237 extern bool kbd_on_hold_p (void);
 238
 239 typedef void (*fd_callback) (int fd, void *data);
 240
 241 extern void add_read_fd (int fd, fd_callback func, void *data);
 242 extern void delete_read_fd (int fd);
 243 extern void add_write_fd (int fd, fd_callback func, void *data);
 244 extern void delete_write_fd (int fd);
 245 #ifdef NS_IMPL_GNUSTEP
 246 extern void catch_child_signal (void);
 247 #endif
 248
 249 extern void update_processes_for_thread_death (Lisp_Object);
 250
 251 INLINE_HEADER_END