1 /* jobs.h -- structures and definitions used by the jobs.c file. */
3 /* Copyright (C) 1993-2009 Free Software Foundation, Inc.
5 This file is part of GNU Bash, the Bourne Again SHell.
7 Bash is free software: you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation, either version 3 of the License, or
10 (at your option) any later version.
12 Bash is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with Bash. If not, see <http://www.gnu.org/licenses/>.
21 #if !defined (_JOBS_H_)
29 #include "posixwait.h"
31 /* Defines controlling the fashion in which jobs are listed. */
32 #define JLIST_STANDARD 0
34 #define JLIST_PID_ONLY 2
35 #define JLIST_CHANGED_ONLY 3
36 #define JLIST_NONINTERACTIVE 4
38 /* I looked it up. For pretty_print_job (). The real answer is 24. */
39 #define LONGEST_SIGNAL_DESC 24
41 /* The max time to sleep while retrying fork() on EAGAIN failure */
42 #define FORKSLEEP_MAX 16
44 /* We keep an array of jobs. Each entry in the array is a linked list
45 of processes that are piped together. The first process encountered is
48 /* Values for the `running' field of a struct process. */
54 /* Each child of the shell is remembered in a STRUCT PROCESS. A circular
55 chain of such structures is a pipeline. */
56 typedef struct process {
57 struct process *next; /* Next process in the pipeline. A circular chain. */
58 pid_t pid; /* Process ID. */
59 WAIT status; /* The status of this command as returned by wait. */
60 int running; /* Non-zero if this process is running. */
61 char *command; /* The particular program that is running. */
64 /* PALIVE really means `not exited' */
65 #define PSTOPPED(p) (WIFSTOPPED((p)->status))
66 #define PRUNNING(p) ((p)->running == PS_RUNNING)
67 #define PALIVE(p) (PRUNNING(p) || PSTOPPED(p))
69 #define PEXITED(p) ((p)->running == PS_DONE)
70 #if defined (RECYCLES_PIDS)
71 # define PRECYCLED(p) ((p)->running == PS_RECYCLED)
73 # define PRECYCLED(p) (0)
75 #define PDEADPROC(p) (PEXITED(p) || PRECYCLED(p))
77 #define get_job_by_jid(ind) (jobs[(ind)])
79 /* A description of a pipeline's state. */
80 typedef enum { JNONE = -1, JRUNNING = 1, JSTOPPED = 2, JDEAD = 4, JMIXED = 8 } JOB_STATE;
81 #define JOBSTATE(job) (jobs[(job)]->state)
82 #define J_JOBSTATE(j) ((j)->state)
84 #define STOPPED(j) (jobs[(j)]->state == JSTOPPED)
85 #define RUNNING(j) (jobs[(j)]->state == JRUNNING)
86 #define DEADJOB(j) (jobs[(j)]->state == JDEAD)
88 #define INVALID_JOB(j) ((j) < 0 || (j) >= js.j_jobslots || get_job_by_jid(j) == 0)
90 /* Values for the FLAGS field in the JOB struct below. */
91 #define J_FOREGROUND 0x01 /* Non-zero if this is running in the foreground. */
92 #define J_NOTIFIED 0x02 /* Non-zero if already notified about job state. */
93 #define J_JOBCONTROL 0x04 /* Non-zero if this job started under job control. */
94 #define J_NOHUP 0x08 /* Don't send SIGHUP to job if shell gets SIGHUP. */
95 #define J_STATSAVED 0x10 /* A process in this job had had status saved via $! */
96 #define J_ASYNC 0x20 /* Job was started asynchronously */
98 #define IS_FOREGROUND(j) ((jobs[j]->flags & J_FOREGROUND) != 0)
99 #define IS_NOTIFIED(j) ((jobs[j]->flags & J_NOTIFIED) != 0)
100 #define IS_JOBCONTROL(j) ((jobs[j]->flags & J_JOBCONTROL) != 0)
101 #define IS_ASYNC(j) ((jobs[j]->flags & J_ASYNC) != 0)
104 char *wd; /* The working directory at time of invocation. */
105 PROCESS *pipe; /* The pipeline of processes that make up this job. */
106 pid_t pgrp; /* The process ID of the process group (necessary). */
107 JOB_STATE state; /* The state that this job is in. */
108 int flags; /* Flags word: J_NOTIFIED, J_FOREGROUND, or J_JOBCONTROL. */
109 #if defined (JOB_CONTROL)
110 COMMAND *deferred; /* Commands that will execute when this job is done. */
111 sh_vptrfunc_t *j_cleanup; /* Cleanup function to call when job marked JDEAD */
112 PTR_T cleanarg; /* Argument passed to (*j_cleanup)() */
113 #endif /* JOB_CONTROL */
119 /* child process statistics */
120 int c_living; /* running or stopped child processes */
121 int c_reaped; /* exited child processes still in jobs list */
122 int c_injobs; /* total number of child processes in jobs list */
123 /* child process totals */
124 int c_totforked; /* total number of children this shell has forked */
125 int c_totreaped; /* total number of children this shell has reaped */
126 /* job counters and indices */
127 int j_jobslots; /* total size of jobs array */
128 int j_lastj; /* last (newest) job allocated */
129 int j_firstj; /* first (oldest) job allocated */
130 int j_njobs; /* number of non-NULL jobs in jobs array */
131 int j_ndead; /* number of JDEAD jobs in jobs array */
133 int j_current; /* current job */
134 int j_previous; /* previous job */
136 JOB *j_lastmade; /* last job allocated by stop_pipeline */
137 JOB *j_lastasync; /* last async job allocated by stop_pipeline */
141 struct pidstat *next;
147 struct pidstat *list;
152 #define NO_JOB -1 /* An impossible job array index. */
153 #define DUP_JOB -2 /* A possible return value for get_job_spec (). */
154 #define BAD_JOBSPEC -3 /* Bad syntax for job spec. */
156 /* A value which cannot be a process ID. */
157 #define NO_PID (pid_t)-1
159 #define ANY_PID (pid_t)-1
162 #if !defined (HAVE_UNISTD_H)
163 extern pid_t fork (), getpid (), getpgrp ();
164 #endif /* !HAVE_UNISTD_H */
166 /* Stuff from the jobs.c file. */
167 extern struct jobstats js;
169 extern pid_t original_pgrp, shell_pgrp, pipeline_pgrp;
170 extern volatile pid_t last_made_pid, last_asynchronous_pid;
171 extern int asynchronous_notification;
175 extern void making_children __P((void));
176 extern void stop_making_children __P((void));
177 extern void cleanup_the_pipeline __P((void));
178 extern void save_pipeline __P((int));
179 extern void restore_pipeline __P((int));
180 extern void start_pipeline __P((void));
181 extern int stop_pipeline __P((int, COMMAND *));
182 extern void append_process __P((char *, pid_t, int, int));
184 extern void delete_job __P((int, int));
185 extern void nohup_job __P((int));
186 extern void delete_all_jobs __P((int));
187 extern void nohup_all_jobs __P((int));
189 extern int count_all_jobs __P((void));
191 extern void terminate_current_pipeline __P((void));
192 extern void terminate_stopped_jobs __P((void));
193 extern void hangup_all_jobs __P((void));
194 extern void kill_current_pipeline __P((void));
196 #if defined (__STDC__) && defined (pid_t)
197 extern int get_job_by_pid __P((int, int));
198 extern void describe_pid __P((int));
200 extern int get_job_by_pid __P((pid_t, int));
201 extern void describe_pid __P((pid_t));
204 extern void list_one_job __P((JOB *, int, int, int));
205 extern void list_all_jobs __P((int));
206 extern void list_stopped_jobs __P((int));
207 extern void list_running_jobs __P((int));
209 extern pid_t make_child __P((char *, int));
211 extern int get_tty_state __P((void));
212 extern int set_tty_state __P((void));
214 extern int job_exit_status __P((int));
215 extern int job_exit_signal __P((int));
217 extern int wait_for_single_pid __P((pid_t));
218 extern void wait_for_background_pids __P((void));
219 extern int wait_for __P((pid_t));
220 extern int wait_for_job __P((int));
221 extern int wait_for_any_job __P((void));
223 extern void notify_and_cleanup __P((void));
224 extern void reap_dead_jobs __P((void));
225 extern int start_job __P((int, int));
226 extern int kill_pid __P((pid_t, int, int));
227 extern int initialize_job_control __P((int));
228 extern void initialize_job_signals __P((void));
229 extern int give_terminal_to __P((pid_t, int));
231 extern void run_sigchld_trap __P((int));
233 extern void freeze_jobs_list __P((void));
234 extern void unfreeze_jobs_list __P((void));
235 extern int set_job_control __P((int));
236 extern void without_job_control __P((void));
237 extern void end_job_control __P((void));
238 extern void restart_job_control __P((void));
239 extern void set_sigchld_handler __P((void));
240 extern void ignore_tty_job_signals __P((void));
241 extern void default_tty_job_signals __P((void));
243 extern void init_job_stats __P((void));
245 extern void close_pgrp_pipe __P((void));
246 extern void save_pgrp_pipe __P((int *, int));
247 extern void restore_pgrp_pipe __P((int *));
249 extern void set_maxchild __P((int));
251 extern int job_control; /* set to 0 in nojobs.c */
253 #endif /* _JOBS_H_ */