jobs.h

   1 /* jobs.h -- structures and stuff used by the jobs.c file. */
   2
   3 /* Copyright (C) 1993 Free Software Foundation, Inc.
   4
   5    This file is part of GNU Bash, the Bourne Again SHell.
   6
   7    Bash is free software; you can redistribute it and/or modify it under
   8    the terms of the GNU General Public License as published by the Free
   9    Software Foundation; either version 2, or (at your option) any later
  10    version.
  11
  12    Bash is distributed in the hope that it will be useful, but WITHOUT ANY
  13    WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15    for more details.
  16
  17    You should have received a copy of the GNU General Public License along
  18    with Bash; see the file COPYING.  If not, write to the Free Software
  19    Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
  20
  21 #if !defined (__JOBS_H__)
  22 #  define __JOBS_H__
  23
  24 #include "quit.h"
  25 #include "siglist.h"
  26
  27 #include "stdc.h"
  28
  29 /* Defines controlling the fashion in which jobs are listed. */
  30 #define JLIST_STANDARD 0
  31 #define JLIST_LONG     1
  32 #define JLIST_PID_ONLY 2
  33 #define JLIST_CHANGED_ONLY 3
  34
  35 #if defined (HAVE_WAIT_H)
  36 #  include <sys/wait.h>
  37 #else /* !HAVE_WAIT_H */
  38
  39 #  include "bash_endian.h"
  40
  41 #  if !defined (_POSIX_VERSION)
  42 #    if defined (LITTLE_ENDIAN)
  43 union wait
  44   {
  45     int w_status;               /* used in syscall */
  46
  47     /* Terminated process status. */
  48     struct
  49       {
  50         unsigned short
  51           w_Termsig  : 7,       /* termination signal */
  52           w_Coredump : 1,       /* core dump indicator */
  53           w_Retcode  : 8,       /* exit code if w_termsig==0 */
  54           w_Fill1    : 16;      /* high 16 bits unused */
  55       } w_T;
  56
  57     /* Stopped process status.  Returned
  58        only for traced children unless requested
  59        with the WUNTRACED option bit. */
  60     struct
  61       {
  62         unsigned short
  63           w_Stopval : 8,        /* == W_STOPPED if stopped */
  64           w_Stopsig : 8,        /* actually zero on XENIX */
  65           w_Fill2   : 16;       /* high 16 bits unused */
  66       } w_S;
  67   };
  68
  69 #    else  /* !LITTLE_ENDIAN */
  70
  71 /* This is for big-endian machines like the IBM RT, HP 9000, or Sun-3 */
  72
  73 union wait
  74   {
  75     int w_status;               /* used in syscall */
  76
  77     /* Terminated process status. */
  78     struct
  79       {
  80         unsigned short w_Fill1    : 16; /* high 16 bits unused */
  81         unsigned       w_Retcode  : 8;  /* exit code if w_termsig==0 */
  82         unsigned       w_Coredump : 1;  /* core dump indicator */
  83         unsigned       w_Termsig  : 7;  /* termination signal */
  84       } w_T;
  85
  86     /* Stopped process status.  Returned
  87        only for traced children unless requested
  88        with the WUNTRACED option bit. */
  89     struct
  90       {
  91         unsigned short w_Fill2   : 16;  /* high 16 bits unused */
  92         unsigned       w_Stopsig : 8;   /* signal that stopped us */
  93         unsigned       w_Stopval : 8;   /* == W_STOPPED if stopped */
  94       } w_S;
  95   };
  96
  97 #    endif /* !LITTLE_ENDIAN */
  98
  99 #    define w_termsig  w_T.w_Termsig
 100 #    define w_coredump w_T.w_Coredump
 101 #    define w_retcode  w_T.w_Retcode
 102 #    define w_stopval  w_S.w_Stopval
 103 #    define w_stopsig  w_S.w_Stopsig
 104
 105 /* Note that sys/wait.h defines these for Posix systems. */
 106 #    define WSTOPPED 0177
 107 #    define WIFSTOPPED(x) (((x) . w_stopval) == WSTOPPED)
 108 #    define WIFEXITED(x) ((! (WIFSTOPPED (x))) && (((x) . w_termsig) == 0))
 109 #    define WIFSIGNALED(x) ((! (WIFSTOPPED (x))) && (((x) . w_termsig) != 0))
 110 #  endif /* !_POSIX_VERSION */
 111 #endif  /* !HAVE_WAIT_H */
 112
 113 /* How to get the status of a job.  For Posix, this is just an
 114    int, but for other systems we have to crack the union wait. */
 115 #if !defined (_POSIX_VERSION)
 116 #  define pid_t int
 117 typedef union wait WAIT;
 118 #  define WSTATUS(t)  (t.w_status)
 119 #else /* _POSIX_VERSION */
 120 typedef int WAIT;
 121 #  define WSTATUS(t)  (t)
 122 #endif /* _POSIX_VERSION */
 123
 124 /* Make sure that parameters to wait3 are defined. */
 125 #if !defined (WNOHANG)
 126 #  define WNOHANG 1
 127 #  define WUNTRACED 2
 128 #endif /* WNOHANG */
 129
 130 /* More Posix P1003.1 definitions.  In the POSIX versions, the parameter is
 131    passed as an `int', in the non-POSIX version, as `union wait'. */
 132 #if defined (_POSIX_VERSION)
 133
 134 #  if !defined (WSTOPSIG)
 135 #    define WSTOPSIG(s)       ((s) >> 8)
 136 #  endif /* !WSTOPSIG */
 137
 138 #  if !defined (WTERMSIG)
 139 #    define WTERMSIG(s)       ((s) & 0177)
 140 #  endif /* !WTERMSIG */
 141
 142 #  if !defined (WEXITSTATUS)
 143 #    define WEXITSTATUS(s)    ((s) >> 8)
 144 #  endif /* !WEXITSTATUS */
 145
 146 #  if !defined (WIFSTOPPED)
 147 #    define WIFSTOPPED(s)     (((s) & 0177) == 0177)
 148 #  endif /* !WIFSTOPPED */
 149
 150 #  if !defined (WIFEXITED)
 151 #    define WIFEXITED(s)      (((s) & 0377) == 0)
 152 #  endif /* !WIFEXITED */
 153
 154 #  if !defined (WIFSIGNALED)
 155 #    define WIFSIGNALED(s)    (!WIFSTOPPED(s) && !WIFEXITED(s))
 156 #  endif /* !WIFSIGNALED */
 157
 158 #  if !defined (WIFCORED)
 159 #    define WIFCORED(s)       ((s) & 0200)
 160 #  endif /* !WIFCORED */
 161
 162 #else /* !_POSIX_VERSION */
 163
 164 #  if !defined (WSTOPSIG)
 165 #    define WSTOPSIG(s)       ((s).w_stopsig)
 166 #  endif /* !WSTOPSIG */
 167
 168 #  if !defined (WTERMSIG)
 169 #    define WTERMSIG(s)       ((s).w_termsig)
 170 #  endif /* !WTERMSIG */
 171
 172 #  if !defined (WEXITSTATUS)
 173 #    define WEXITSTATUS(s)    ((s).w_retcode)
 174 #  endif /* !WEXITSTATUS */
 175
 176 #  if !defined (WIFCORED)
 177 #    define WIFCORED(s)       ((s).w_coredump)
 178 #  endif /* !WIFCORED */
 179
 180 #endif /* !_POSIX_VERSION */
 181
 182 /* I looked it up.  For pretty_print_job ().  The real answer is 24. */
 183 #define LONGEST_SIGNAL_DESC 24
 184
 185 /* We keep an array of jobs.  Each entry in the array is a linked list
 186    of processes that are piped together.  The first process encountered is
 187    the group leader. */
 188
 189 /* Each child of the shell is remembered in a STRUCT PROCESS.  A chain of
 190    such structures is a pipeline.  The chain is circular. */
 191 typedef struct process {
 192   struct process *next; /* Next process in the pipeline.  A circular chain. */
 193   pid_t pid;            /* Process ID. */
 194   WAIT status;          /* The status of this command as returned by wait. */
 195   int running;          /* Non-zero if this process is running. */
 196   char *command;        /* The particular program that is running. */
 197 } PROCESS;
 198
 199 /* A description of a pipeline's state. */
 200 typedef enum { JRUNNING, JSTOPPED, JDEAD, JMIXED } JOB_STATE;
 201 #define JOBSTATE(job) (jobs[(job)]->state)
 202
 203 /* Values for the FLAGS field in the JOB struct below. */
 204 #define J_FOREGROUND 0x01 /* Non-zero if this is running in the foreground.  */
 205 #define J_NOTIFIED   0x02 /* Non-zero if already notified about job state.   */
 206 #define J_JOBCONTROL 0x04 /* Non-zero if this job started under job control. */
 207
 208 typedef struct job {
 209   char *wd;        /* The working directory at time of invocation. */
 210   PROCESS *pipe;   /* The pipeline of processes that make up this job. */
 211   pid_t pgrp;      /* The process ID of the process group (necessary). */
 212   JOB_STATE state; /* The state that this job is in. */
 213   int flags;       /* Flags word: J_NOTIFIED, J_FOREGROUND, or J_JOBCONTROL. */
 214 #if defined (JOB_CONTROL)
 215   COMMAND *deferred;    /* Commands that will execute when this job is done. */
 216 #endif /* JOB_CONTROL */
 217 } JOB;
 218
 219 #define NO_JOB  -1      /* An impossible job array index. */
 220 #define DUP_JOB -2      /* A possible return value for get_job_spec (). */
 221
 222 /* A value which cannot be a process ID. */
 223 #define NO_PID (pid_t)-1
 224
 225 #if !defined (_POSIX_VERSION) && !defined (sigmask)
 226 #  define sigmask(x) (1 << ((x)-1))
 227 #endif /* !POSIX && !sigmask */
 228
 229 #if !defined (SIGABRT)
 230 #  define SIGABRT SIGIOT
 231 #endif /* !SIGABRT */
 232
 233 #if !defined (SIGCHLD)
 234 #  define SIGCHLD SIGCLD
 235 #endif /* !SIGCHLD */
 236
 237 #if !defined (_POSIX_VERSION)
 238 #  if !defined (SIG_BLOCK)
 239 #    define SIG_BLOCK 2
 240 #    define SIG_SETMASK 3
 241 #  endif /* SIG_BLOCK */
 242
 243 /* Type of a signal set. */
 244 #  define sigset_t int
 245
 246 /* Make sure there is nothing inside the signal set. */
 247 #  define sigemptyset(set) (*(set) = 0)
 248
 249 /* Initialize the signal set to hold all signals. */
 250 #  define sigfillset(set) (*set) = sigmask (NSIG) - 1
 251
 252 /* Add SIG to the contents of SET. */
 253 #  define sigaddset(set, sig) *(set) |= sigmask (sig)
 254
 255 /* Delete SIG from signal set SET. */
 256 #  define sigdelset(set, sig) *(set) &= ~sigmask (sig)
 257
 258 /* Is SIG a member of the signal set SET? */
 259 #  define sigismember(set, sig) ((*(set) & sigmask (sig)) != 0)
 260
 261 /* Suspend the process until the reception of one of the signals
 262    not present in SET. */
 263 #  define sigsuspend(set) sigpause (*(set))
 264 #endif /* !_POSIX_VERSION */
 265
 266 /* These definitions are used both in POSIX and non-POSIX implementations. */
 267
 268 #define BLOCK_SIGNAL(sig, nvar, ovar) \
 269   sigemptyset (&nvar); \
 270   sigaddset (&nvar, sig); \
 271   sigemptyset (&ovar); \
 272   sigprocmask (SIG_BLOCK, &nvar, &ovar)
 273
 274 #if defined (_POSIX_VERSION)
 275 #  define BLOCK_CHILD(nvar, ovar) \
 276         BLOCK_SIGNAL (SIGCHLD, nvar, ovar)
 277 #  define UNBLOCK_CHILD(ovar) \
 278         sigprocmask (SIG_SETMASK, &ovar, (sigset_t *) NULL)
 279 #else /* !_POSIX_VERSION */
 280 #  define BLOCK_CHILD(nvar, ovar) ovar = sigblock (sigmask (SIGCHLD))
 281 #  define UNBLOCK_CHILD(ovar) sigsetmask (ovar)
 282 #endif /* !_POSIX_VERSION */
 283
 284 /* System calls. */
 285 #if !defined (SunOS5) && !defined (USGr4_2) && !defined (__BSD_4_4__)
 286 extern pid_t fork (), getpid (), getpgrp ();
 287 #endif /* !SunOS5 && !USGr4_2 && !__BSD_4_4__ */
 288
 289 /* Stuff from the jobs.c file. */
 290 extern pid_t  original_pgrp, shell_pgrp, pipeline_pgrp;
 291 extern pid_t last_made_pid, last_asynchronous_pid;
 292 extern int current_job, previous_job;
 293 extern int asynchronous_notification;
 294 extern JOB **jobs;
 295 extern int job_slots;
 296
 297 extern void making_children __P((void));
 298 extern void stop_making_children __P((void));
 299 extern void cleanup_the_pipeline __P((void));
 300 extern void start_pipeline __P((void));
 301 extern int stop_pipeline __P((int, COMMAND *));
 302 extern void delete_job __P((int));
 303
 304 extern void terminate_current_pipeline __P((void));
 305 extern void terminate_stopped_jobs __P((void));
 306 extern void hangup_all_jobs __P((void));
 307 extern void kill_current_pipeline __P((void));
 308
 309 #if defined (__STDC__) && defined (pid_t)
 310 extern void describe_pid __P((int));
 311 #else
 312 extern void describe_pid __P((pid_t));
 313 #endif
 314
 315 extern int list_one_job __P((JOB *, int, int, int));
 316 extern void list_jobs __P((int));
 317
 318 extern pid_t make_child __P((char *, int));
 319 extern int get_tty_state __P((void));
 320 extern int set_tty_state __P((void));
 321
 322 extern int wait_for_single_pid __P((pid_t));
 323 extern void wait_for_background_pids __P((void));
 324 extern int wait_for __P((pid_t));
 325 extern int wait_for_job __P((int));
 326
 327 extern void notify_and_cleanup __P((void));
 328 extern void reap_dead_jobs __P((void));
 329 extern int start_job __P((int, int));
 330 extern int kill_pid __P((pid_t, int, int));
 331 extern int initialize_jobs __P((void));
 332 extern void initialize_job_signals __P((void));
 333 extern int give_terminal_to __P((pid_t));
 334
 335 extern int set_job_control __P((int));
 336 extern void without_job_control __P((void));
 337 extern void end_job_control __P((void));
 338 extern void restart_job_control __P((void));
 339 extern void set_sigchld_handler __P((void));
 340
 341 #if defined (JOB_CONTROL)
 342 extern int job_control;
 343 #endif
 344
 345 #endif /* __JOBS_H__ */