forked from apple-oss-distributions/bash
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jobs.c
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jobs.c
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/* The thing that makes children, remembers them, and contains wait loops. */
/* This file works with both POSIX and BSD systems. It implements job
control. */
/* Copyright (C) 1989-2006 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
Bash is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with Bash; see the file COPYING. If not, write to the Free Software
Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
#include "config.h"
#include "bashtypes.h"
#include "trap.h"
#include <stdio.h>
#include <signal.h>
#include <errno.h>
#if defined (HAVE_UNISTD_H)
# include <unistd.h>
#endif
#include "posixtime.h"
#if defined (HAVE_SYS_RESOURCE_H) && defined (HAVE_WAIT3) && !defined (_POSIX_VERSION) && !defined (RLIMTYPE)
# include <sys/resource.h>
#endif /* !_POSIX_VERSION && HAVE_SYS_RESOURCE_H && HAVE_WAIT3 && !RLIMTYPE */
#if defined (HAVE_SYS_FILE_H)
# include <sys/file.h>
#endif
#include "filecntl.h"
#include <sys/ioctl.h>
#include <sys/param.h>
#if defined (BUFFERED_INPUT)
# include "input.h"
#endif
/* Need to include this up here for *_TTY_DRIVER definitions. */
#include "shtty.h"
/* Define this if your output is getting swallowed. It's a no-op on
machines with the termio or termios tty drivers. */
/* #define DRAIN_OUTPUT */
/* For the TIOCGPGRP and TIOCSPGRP ioctl parameters on HP-UX */
#if defined (hpux) && !defined (TERMIOS_TTY_DRIVER)
# include <bsdtty.h>
#endif /* hpux && !TERMIOS_TTY_DRIVER */
#include "bashansi.h"
#include "bashintl.h"
#include "shell.h"
#include "jobs.h"
#include "flags.h"
#include "builtins/builtext.h"
#include "builtins/common.h"
#if !defined (errno)
extern int errno;
#endif /* !errno */
#define DEFAULT_CHILD_MAX 32
#if !defined (DEBUG)
#define MAX_JOBS_IN_ARRAY 4096 /* production */
#else
#define MAX_JOBS_IN_ARRAY 128 /* testing */
#endif
/* Flag values for second argument to delete_job */
#define DEL_WARNSTOPPED 1 /* warn about deleting stopped jobs */
#define DEL_NOBGPID 2 /* don't add pgrp leader to bgpids */
/* Take care of system dependencies that must be handled when waiting for
children. The arguments to the WAITPID macro match those to the Posix.1
waitpid() function. */
#if defined (ultrix) && defined (mips) && defined (_POSIX_VERSION)
# define WAITPID(pid, statusp, options) \
wait3 ((union wait *)statusp, options, (struct rusage *)0)
#else
# if defined (_POSIX_VERSION) || defined (HAVE_WAITPID)
# define WAITPID(pid, statusp, options) \
waitpid ((pid_t)pid, statusp, options)
# else
# if defined (HAVE_WAIT3)
# define WAITPID(pid, statusp, options) \
wait3 (statusp, options, (struct rusage *)0)
# else
# define WAITPID(pid, statusp, options) \
wait3 (statusp, options, (int *)0)
# endif /* HAVE_WAIT3 */
# endif /* !_POSIX_VERSION && !HAVE_WAITPID*/
#endif /* !(Ultrix && mips && _POSIX_VERSION) */
/* getpgrp () varies between systems. Even systems that claim to be
Posix.1 compatible lie sometimes (Ultrix, SunOS4, apollo). */
#if defined (GETPGRP_VOID)
# define getpgid(p) getpgrp ()
#else
# define getpgid(p) getpgrp (p)
#endif /* !GETPGRP_VOID */
/* If the system needs it, REINSTALL_SIGCHLD_HANDLER will reinstall the
handler for SIGCHLD. */
#if defined (MUST_REINSTALL_SIGHANDLERS)
# define REINSTALL_SIGCHLD_HANDLER signal (SIGCHLD, sigchld_handler)
#else
# define REINSTALL_SIGCHLD_HANDLER
#endif /* !MUST_REINSTALL_SIGHANDLERS */
/* Some systems let waitpid(2) tell callers about stopped children. */
#if !defined (WCONTINUED) || defined (WCONTINUED_BROKEN)
# undef WCONTINUED
# define WCONTINUED 0
#endif
#if !defined (WIFCONTINUED)
# define WIFCONTINUED(s) (0)
#endif
/* The number of additional slots to allocate when we run out. */
#define JOB_SLOTS 8
typedef int sh_job_map_func_t __P((JOB *, int, int, int));
/* Variables used here but defined in other files. */
extern int subshell_environment, line_number;
extern int posixly_correct, shell_level;
extern int last_command_exit_value, last_command_exit_signal;
extern int loop_level, breaking;
extern int sourcelevel;
extern int running_trap;
extern sh_builtin_func_t *this_shell_builtin;
extern char *shell_name, *this_command_name;
extern sigset_t top_level_mask;
extern procenv_t wait_intr_buf;
extern int wait_signal_received;
extern WORD_LIST *subst_assign_varlist;
static struct jobstats zerojs = { -1L, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, NO_JOB, NO_JOB, 0, 0 };
struct jobstats js = { -1L, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, NO_JOB, NO_JOB, 0, 0 };
struct bgpids bgpids = { 0, 0, 0 };
/* The array of known jobs. */
JOB **jobs = (JOB **)NULL;
#if 0
/* The number of slots currently allocated to JOBS. */
int job_slots = 0;
#endif
/* The controlling tty for this shell. */
int shell_tty = -1;
/* The shell's process group. */
pid_t shell_pgrp = NO_PID;
/* The terminal's process group. */
pid_t terminal_pgrp = NO_PID;
/* The process group of the shell's parent. */
pid_t original_pgrp = NO_PID;
/* The process group of the pipeline currently being made. */
pid_t pipeline_pgrp = (pid_t)0;
#if defined (PGRP_PIPE)
/* Pipes which each shell uses to communicate with the process group leader
until all of the processes in a pipeline have been started. Then the
process leader is allowed to continue. */
int pgrp_pipe[2] = { -1, -1 };
#endif
#if 0
/* The job which is current; i.e. the one that `%+' stands for. */
int current_job = NO_JOB;
/* The previous job; i.e. the one that `%-' stands for. */
int previous_job = NO_JOB;
#endif
/* Last child made by the shell. */
pid_t last_made_pid = NO_PID;
/* Pid of the last asynchronous child. */
pid_t last_asynchronous_pid = NO_PID;
/* The pipeline currently being built. */
PROCESS *the_pipeline = (PROCESS *)NULL;
/* If this is non-zero, do job control. */
int job_control = 1;
/* Call this when you start making children. */
int already_making_children = 0;
/* If this is non-zero, $LINES and $COLUMNS are reset after every process
exits from get_tty_state(). */
int check_window_size;
/* Functions local to this file. */
static void run_sigchld_trap __P((int));
static sighandler wait_sigint_handler __P((int));
static sighandler sigchld_handler __P((int));
static sighandler sigcont_sighandler __P((int));
static sighandler sigstop_sighandler __P((int));
static int waitchld __P((pid_t, int));
static PROCESS *find_pipeline __P((pid_t, int, int *));
static PROCESS *find_process __P((pid_t, int, int *));
static char *current_working_directory __P((void));
static char *job_working_directory __P((void));
static char *j_strsignal __P((int));
static char *printable_job_status __P((int, PROCESS *, int));
static PROCESS *find_last_proc __P((int, int));
static pid_t find_last_pid __P((int, int));
static int set_new_line_discipline __P((int));
static int map_over_jobs __P((sh_job_map_func_t *, int, int));
static int job_last_stopped __P((int));
static int job_last_running __P((int));
static int most_recent_job_in_state __P((int, JOB_STATE));
static int find_job __P((pid_t, int, PROCESS **));
static int print_job __P((JOB *, int, int, int));
static int process_exit_status __P((WAIT));
static int process_exit_signal __P((WAIT));
static int job_exit_status __P((int));
static int job_exit_signal __P((int));
static int set_job_status_and_cleanup __P((int));
static WAIT job_signal_status __P((int));
static WAIT raw_job_exit_status __P((int));
static void notify_of_job_status __P((void));
static void reset_job_indices __P((void));
static void cleanup_dead_jobs __P((void));
static int processes_in_job __P((int));
static void realloc_jobs_list __P((void));
static int compact_jobs_list __P((int));
static int discard_pipeline __P((PROCESS *));
static void add_process __P((char *, pid_t));
static void print_pipeline __P((PROCESS *, int, int, FILE *));
static void pretty_print_job __P((int, int, FILE *));
static void set_current_job __P((int));
static void reset_current __P((void));
static void set_job_running __P((int));
static void setjstatus __P((int));
static void mark_all_jobs_as_dead __P((void));
static void mark_dead_jobs_as_notified __P((int));
static void restore_sigint_handler __P((void));
#if defined (PGRP_PIPE)
static void pipe_read __P((int *));
static void pipe_close __P((int *));
#endif
static struct pidstat *bgp_alloc __P((pid_t, int));
static struct pidstat *bgp_add __P((pid_t, int));
static int bgp_delete __P((pid_t));
static void bgp_clear __P((void));
static int bgp_search __P((pid_t));
static void bgp_prune __P((void));
#if defined (ARRAY_VARS)
static int *pstatuses; /* list of pipeline statuses */
static int statsize;
#endif
/* Used to synchronize between wait_for and other functions and the SIGCHLD
signal handler. */
static int sigchld;
static int queue_sigchld;
#define QUEUE_SIGCHLD(os) (os) = sigchld, queue_sigchld++
#define UNQUEUE_SIGCHLD(os) \
do { \
queue_sigchld--; \
if (queue_sigchld == 0 && os != sigchld) \
waitchld (-1, 0); \
} while (0)
static SigHandler *old_tstp, *old_ttou, *old_ttin;
static SigHandler *old_cont = (SigHandler *)SIG_DFL;
/* A place to temporarily save the current pipeline. */
static PROCESS *saved_pipeline;
static int saved_already_making_children;
/* Set this to non-zero whenever you don't want the jobs list to change at
all: no jobs deleted and no status change notifications. This is used,
for example, when executing SIGCHLD traps, which may run arbitrary
commands. */
static int jobs_list_frozen;
static char retcode_name_buffer[64];
/* flags to detect pid wraparound */
static pid_t first_pid = NO_PID;
static int pid_wrap = -1;
#if !defined (_POSIX_VERSION)
/* These are definitions to map POSIX 1003.1 functions onto existing BSD
library functions and system calls. */
#define setpgid(pid, pgrp) setpgrp (pid, pgrp)
#define tcsetpgrp(fd, pgrp) ioctl ((fd), TIOCSPGRP, &(pgrp))
pid_t
tcgetpgrp (fd)
int fd;
{
pid_t pgrp;
/* ioctl will handle setting errno correctly. */
if (ioctl (fd, TIOCGPGRP, &pgrp) < 0)
return (-1);
return (pgrp);
}
#endif /* !_POSIX_VERSION */
/* Initialize the global job stats structure and other bookkeeping variables */
void
init_job_stats ()
{
js = zerojs;
first_pid = NO_PID;
pid_wrap = -1;
}
/* Return the working directory for the current process. Unlike
job_working_directory, this does not call malloc (), nor do any
of the functions it calls. This is so that it can safely be called
from a signal handler. */
static char *
current_working_directory ()
{
char *dir;
static char d[PATH_MAX];
dir = get_string_value ("PWD");
if (dir == 0 && the_current_working_directory && no_symbolic_links)
dir = the_current_working_directory;
if (dir == 0)
{
dir = getcwd (d, sizeof(d));
if (dir)
dir = d;
}
return (dir == 0) ? "<unknown>" : dir;
}
/* Return the working directory for the current process. */
static char *
job_working_directory ()
{
char *dir;
dir = get_string_value ("PWD");
if (dir)
return (savestring (dir));
dir = get_working_directory ("job-working-directory");
if (dir)
return (dir);
return (savestring ("<unknown>"));
}
void
making_children ()
{
if (already_making_children)
return;
already_making_children = 1;
start_pipeline ();
}
void
stop_making_children ()
{
already_making_children = 0;
}
void
cleanup_the_pipeline ()
{
PROCESS *disposer;
sigset_t set, oset;
BLOCK_CHILD (set, oset);
disposer = the_pipeline;
the_pipeline = (PROCESS *)NULL;
UNBLOCK_CHILD (oset);
if (disposer)
discard_pipeline (disposer);
}
void
save_pipeline (clear)
int clear;
{
saved_pipeline = the_pipeline;
if (clear)
the_pipeline = (PROCESS *)NULL;
saved_already_making_children = already_making_children;
}
void
restore_pipeline (discard)
int discard;
{
PROCESS *old_pipeline;
old_pipeline = the_pipeline;
the_pipeline = saved_pipeline;
already_making_children = saved_already_making_children;
if (discard)
discard_pipeline (old_pipeline);
}
/* Start building a pipeline. */
void
start_pipeline ()
{
if (the_pipeline)
{
cleanup_the_pipeline ();
pipeline_pgrp = 0;
#if defined (PGRP_PIPE)
pipe_close (pgrp_pipe);
#endif
}
#if defined (PGRP_PIPE)
if (job_control)
{
if (pipe (pgrp_pipe) == -1)
sys_error ("start_pipeline: pgrp pipe");
}
#endif
}
/* Stop building a pipeline. Install the process list in the job array.
This returns the index of the newly installed job.
DEFERRED is a command structure to be executed upon satisfactory
execution exit of this pipeline. */
int
stop_pipeline (async, deferred)
int async;
COMMAND *deferred;
{
register int i, j;
JOB *newjob;
sigset_t set, oset;
BLOCK_CHILD (set, oset);
#if defined (PGRP_PIPE)
/* The parent closes the process group synchronization pipe. */
pipe_close (pgrp_pipe);
#endif
cleanup_dead_jobs ();
if (js.j_jobslots == 0)
{
js.j_jobslots = JOB_SLOTS;
jobs = (JOB **)xmalloc (js.j_jobslots * sizeof (JOB *));
/* Now blank out these new entries. */
for (i = 0; i < js.j_jobslots; i++)
jobs[i] = (JOB *)NULL;
js.j_firstj = js.j_lastj = js.j_njobs = 0;
}
/* Scan from the last slot backward, looking for the next free one. */
/* XXX - revisit this interactive assumption */
/* XXX - this way for now */
if (interactive)
{
for (i = js.j_jobslots; i; i--)
if (jobs[i - 1])
break;
}
else
{
#if 0
/* This wraps around, but makes it inconvenient to extend the array */
for (i = js.j_lastj+1; i != js.j_lastj; i++)
{
if (i >= js.j_jobslots)
i = 0;
if (jobs[i] == 0)
break;
}
if (i == js.j_lastj)
i = js.j_jobslots;
#else
/* This doesn't wrap around yet. */
for (i = js.j_lastj ? js.j_lastj + 1 : js.j_lastj; i < js.j_jobslots; i++)
if (jobs[i] == 0)
break;
#endif
}
/* Do we need more room? */
/* First try compaction */
if ((interactive_shell == 0 || subshell_environment) && i == js.j_jobslots && js.j_jobslots >= MAX_JOBS_IN_ARRAY)
i = compact_jobs_list (0);
/* If we can't compact, reallocate */
if (i == js.j_jobslots)
{
js.j_jobslots += JOB_SLOTS;
jobs = (JOB **)xrealloc (jobs, (js.j_jobslots * sizeof (JOB *)));
for (j = i; j < js.j_jobslots; j++)
jobs[j] = (JOB *)NULL;
}
/* Add the current pipeline to the job list. */
if (the_pipeline)
{
register PROCESS *p;
int any_running, any_stopped, n;
newjob = (JOB *)xmalloc (sizeof (JOB));
for (n = 1, p = the_pipeline; p->next != the_pipeline; n++, p = p->next)
;
p->next = (PROCESS *)NULL;
newjob->pipe = REVERSE_LIST (the_pipeline, PROCESS *);
for (p = newjob->pipe; p->next; p = p->next)
;
p->next = newjob->pipe;
the_pipeline = (PROCESS *)NULL;
newjob->pgrp = pipeline_pgrp;
pipeline_pgrp = 0;
newjob->flags = 0;
/* Flag to see if in another pgrp. */
if (job_control)
newjob->flags |= J_JOBCONTROL;
/* Set the state of this pipeline. */
p = newjob->pipe;
any_running = any_stopped = 0;
do
{
any_running |= PRUNNING (p);
any_stopped |= PSTOPPED (p);
p = p->next;
}
while (p != newjob->pipe);
newjob->state = any_running ? JRUNNING : (any_stopped ? JSTOPPED : JDEAD);
newjob->wd = job_working_directory ();
newjob->deferred = deferred;
newjob->j_cleanup = (sh_vptrfunc_t *)NULL;
newjob->cleanarg = (PTR_T) NULL;
jobs[i] = newjob;
if (newjob->state == JDEAD && (newjob->flags & J_FOREGROUND))
setjstatus (i);
if (newjob->state == JDEAD)
{
js.c_reaped += n; /* wouldn't have been done since this was not part of a job */
js.j_ndead++;
}
js.c_injobs += n;
js.j_lastj = i;
js.j_njobs++;
}
else
newjob = (JOB *)NULL;
if (newjob)
js.j_lastmade = newjob;
if (async)
{
if (newjob)
{
newjob->flags &= ~J_FOREGROUND;
newjob->flags |= J_ASYNC;
js.j_lastasync = newjob;
}
reset_current ();
}
else
{
if (newjob)
{
newjob->flags |= J_FOREGROUND;
/*
* !!!!! NOTE !!!!! (chet@ins.cwru.edu)
*
* The currently-accepted job control wisdom says to set the
* terminal's process group n+1 times in an n-step pipeline:
* once in the parent and once in each child. This is where
* the parent gives it away.
*
* Don't give the terminal away if this shell is an asynchronous
* subshell.
*
*/
if (job_control && newjob->pgrp && (subshell_environment&SUBSHELL_ASYNC) == 0)
give_terminal_to (newjob->pgrp, 0);
}
}
stop_making_children ();
UNBLOCK_CHILD (oset);
return (js.j_current);
}
/* Functions to manage the list of exited background pids whose status has
been saved. */
static struct pidstat *
bgp_alloc (pid, status)
pid_t pid;
int status;
{
struct pidstat *ps;
ps = (struct pidstat *)xmalloc (sizeof (struct pidstat));
ps->pid = pid;
ps->status = status;
ps->next = (struct pidstat *)0;
return ps;
}
static struct pidstat *
bgp_add (pid, status)
pid_t pid;
int status;
{
struct pidstat *ps;
ps = bgp_alloc (pid, status);
if (bgpids.list == 0)
{
bgpids.list = bgpids.end = ps;
bgpids.npid = 0; /* just to make sure */
}
else
{
bgpids.end->next = ps;
bgpids.end = ps;
}
bgpids.npid++;
if (bgpids.npid > js.c_childmax)
bgp_prune ();
return ps;
}
static int
bgp_delete (pid)
pid_t pid;
{
struct pidstat *prev, *p;
for (prev = p = bgpids.list; p; prev = p, p = p->next)
if (p->pid == pid)
{
prev->next = p->next; /* remove from list */
break;
}
if (p == 0)
return 0; /* not found */
#if defined (DEBUG)
itrace("bgp_delete: deleting %d", pid);
#endif
/* Housekeeping in the border cases. */
if (p == bgpids.list)
bgpids.list = bgpids.list->next;
else if (p == bgpids.end)
bgpids.end = prev;
bgpids.npid--;
if (bgpids.npid == 0)
bgpids.list = bgpids.end = 0;
else if (bgpids.npid == 1)
bgpids.end = bgpids.list; /* just to make sure */
free (p);
return 1;
}
/* Clear out the list of saved statuses */
static void
bgp_clear ()
{
struct pidstat *ps, *p;
for (ps = bgpids.list; ps; )
{
p = ps;
ps = ps->next;
free (p);
}
bgpids.list = bgpids.end = 0;
bgpids.npid = 0;
}
/* Search for PID in the list of saved background pids; return its status if
found. If not found, return -1. */
static int
bgp_search (pid)
pid_t pid;
{
struct pidstat *ps;
for (ps = bgpids.list ; ps; ps = ps->next)
if (ps->pid == pid)
return ps->status;
return -1;
}
static void
bgp_prune ()
{
struct pidstat *ps;
while (bgpids.npid > js.c_childmax)
{
ps = bgpids.list;
bgpids.list = bgpids.list->next;
free (ps);
bgpids.npid--;
}
}
/* Reset the values of js.j_lastj and js.j_firstj after one or both have
been deleted. The caller should check whether js.j_njobs is 0 before
calling this. This wraps around, but the rest of the code does not. At
this point, it should not matter. */
static void
reset_job_indices ()
{
int old;
if (jobs[js.j_firstj] == 0)
{
old = js.j_firstj++;
if (old >= js.j_jobslots)
old = js.j_jobslots - 1;
while (js.j_firstj != old)
{
if (js.j_firstj >= js.j_jobslots)
js.j_firstj = 0;
if (jobs[js.j_firstj] || js.j_firstj == old) /* needed if old == 0 */
break;
js.j_firstj++;
}
if (js.j_firstj == old)
js.j_firstj = js.j_lastj = js.j_njobs = 0;
}
if (jobs[js.j_lastj] == 0)
{
old = js.j_lastj--;
if (old < 0)
old = 0;
while (js.j_lastj != old)
{
if (js.j_lastj < 0)
js.j_lastj = js.j_jobslots - 1;
if (jobs[js.j_lastj] || js.j_lastj == old) /* needed if old == js.j_jobslots */
break;
js.j_lastj--;
}
if (js.j_lastj == old)
js.j_firstj = js.j_lastj = js.j_njobs = 0;
}
}
/* Delete all DEAD jobs that the user had received notification about. */
static void
cleanup_dead_jobs ()
{
register int i;
int os;
if (js.j_jobslots == 0 || jobs_list_frozen)
return;
QUEUE_SIGCHLD(os);
/* XXX could use js.j_firstj and js.j_lastj here */
for (i = 0; i < js.j_jobslots; i++)
{
#if defined (DEBUG)
if (i < js.j_firstj && jobs[i])
itrace("cleanup_dead_jobs: job %d non-null before js.j_firstj (%d)", i, js.j_firstj);
if (i > js.j_lastj && jobs[i])
itrace("cleanup_dead_jobs: job %d non-null after js.j_lastj (%d)", i, js.j_lastj);
#endif
if (jobs[i] && DEADJOB (i) && IS_NOTIFIED (i))
delete_job (i, 0);
}
UNQUEUE_SIGCHLD(os);
}
static int
processes_in_job (job)
int job;
{
int nproc;
register PROCESS *p;
nproc = 0;
p = jobs[job]->pipe;
do
{
p = p->next;
nproc++;
}
while (p != jobs[job]->pipe);
return nproc;
}
static void
delete_old_job (pid)
pid_t pid;
{
PROCESS *p;
int job;
job = find_job (pid, 0, &p);
if (job != NO_JOB)
{
#ifdef DEBUG
itrace ("delete_old_job: found pid %d in job %d with state %d", pid, job, jobs[job]->state);
#endif
if (JOBSTATE (job) == JDEAD)
delete_job (job, DEL_NOBGPID);
else
{
internal_warning (_("forked pid %d appears in running job %d"), pid, job);
if (p)
p->pid = 0;
}
}
}
/* Reallocate and compress the jobs list. This returns with a jobs array
whose size is a multiple of JOB_SLOTS and can hold the current number of
jobs. Heuristics are used to minimize the number of new reallocs. */
static void
realloc_jobs_list ()
{
sigset_t set, oset;
int nsize, i, j, ncur, nprev;
JOB **nlist;
ncur = nprev = NO_JOB;
nsize = ((js.j_njobs + JOB_SLOTS - 1) / JOB_SLOTS);
nsize *= JOB_SLOTS;
i = js.j_njobs % JOB_SLOTS;
if (i == 0 || i > (JOB_SLOTS >> 1))
nsize += JOB_SLOTS;
BLOCK_CHILD (set, oset);
nlist = (js.j_jobslots == nsize) ? jobs : (JOB **) xmalloc (nsize * sizeof (JOB *));
for (i = j = 0; i < js.j_jobslots; i++)
if (jobs[i])
{
if (i == js.j_current)
ncur = j;
if (i == js.j_previous)
nprev = j;
nlist[j++] = jobs[i];
}
#if defined (DEBUG)
itrace ("realloc_jobs_list: resize jobs list from %d to %d", js.j_jobslots, nsize);
itrace ("realloc_jobs_list: j_lastj changed from %d to %d", js.j_lastj, (j > 0) ? j - 1 : 0);
itrace ("realloc_jobs_list: j_njobs changed from %d to %d", js.j_njobs, (j > 0) ? j - 1 : 0);
#endif
js.j_firstj = 0;
js.j_lastj = (j > 0) ? j - 1 : 0;
js.j_njobs = j;
js.j_jobslots = nsize;
/* Zero out remaining slots in new jobs list */
for ( ; j < nsize; j++)
nlist[j] = (JOB *)NULL;
if (jobs != nlist)
{
free (jobs);
jobs = nlist;
}
if (ncur != NO_JOB)
js.j_current = ncur;
if (nprev != NO_JOB)
js.j_previous = nprev;
/* Need to reset these */
if (js.j_current == NO_JOB || js.j_previous == NO_JOB || js.j_current > js.j_lastj || js.j_previous > js.j_lastj)
reset_current ();
#ifdef DEBUG
itrace ("realloc_jobs_list: reset js.j_current (%d) and js.j_previous (%d)", js.j_current, js.j_previous);
#endif
UNBLOCK_CHILD (oset);
}
/* Compact the jobs list by removing dead jobs. Assumed that we have filled
the jobs array to some predefined maximum. Called when the shell is not
the foreground process (subshell_environment != 0). Returns the first
available slot in the compacted list. If that value is js.j_jobslots, then
the list needs to be reallocated. The jobs array may be in new memory if
this returns > 0 and < js.j_jobslots. FLAGS is reserved for future use. */
static int
compact_jobs_list (flags)
int flags;
{
if (js.j_jobslots == 0 || jobs_list_frozen)
return js.j_jobslots;
reap_dead_jobs ();
realloc_jobs_list ();
#ifdef DEBUG
itrace("compact_jobs_list: returning %d", (js.j_lastj || jobs[js.j_lastj]) ? js.j_lastj + 1 : 0);
#endif
return ((js.j_lastj || jobs[js.j_lastj]) ? js.j_lastj + 1 : 0);
}
/* Delete the job at INDEX from the job list. Must be called
with SIGCHLD blocked. */
void
delete_job (job_index, dflags)
int job_index, dflags;
{
register JOB *temp;
PROCESS *proc;
int ndel;
if (js.j_jobslots == 0 || jobs_list_frozen)
return;
if ((dflags & DEL_WARNSTOPPED) && subshell_environment == 0 && STOPPED (job_index))
internal_warning (_("deleting stopped job %d with process group %ld"), job_index+1, (long)jobs[job_index]->pgrp);
temp = jobs[job_index];
if (temp == 0)
return;
if ((dflags & DEL_NOBGPID) == 0)
{
proc = find_last_proc (job_index, 0);