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From 223ac53797d33b0473323efc0d5a44d1dceaf746 Mon Sep 17 00:00:00 2001
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From: Peter Stephenson <p.w.stephenson@ntlworld.com>
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Date: Sun, 26 Oct 2014 17:47:42 +0000
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Subject: [PATCH 1/2] 33531 with additions: retain status of exited background
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jobs.
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Add linked list of unwaited-for background jobs.
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Truncate at value of _SC_CHILD_MAX discarding oldest.
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Remove old lastpid_status mechanism for latest exited process only.
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Slightly tighten safety of permanently allocated linked lists so
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that this doesn't compromise signal handling.
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Upstream-commit: b4f7ccecd93ca9e64c3c3c774fdaefae83d7204a
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Signed-off-by: Kamil Dudka <kdudka@redhat.com>
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---
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Doc/Zsh/builtins.yo | 16 ++++++
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Doc/Zsh/options.yo | 8 +--
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Doc/zshoptions.1 | 8 +--
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Src/exec.c | 2 -
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Src/init.c | 1 -
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Src/jobs.c | 138 ++++++++++++++++++++++++++++++++++++++++++++--------
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Src/linklist.c | 4 ++
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Src/signals.c | 14 +++---
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8 files changed, 152 insertions(+), 39 deletions(-)
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diff --git a/Doc/Zsh/builtins.yo b/Doc/Zsh/builtins.yo
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index 46f40cc..edc335e 100644
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--- a/Doc/Zsh/builtins.yo
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+++ b/Doc/Zsh/builtins.yo
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@@ -1905,6 +1905,22 @@ then all currently active child processes are waited for.
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Each var(job) can be either a job specification or the process ID
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of a job in the job table.
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The exit status from this command is that of the job waited for.
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+
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+It is possible to wait for recent processes (specified by process ID,
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+not by job) that were running in the background even if the process has
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+exited. Typically the process ID will be recorded by capturing the
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+value of the variable tt($!) immediately after the process has been
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+started. There is a limit on the number of process IDs remembered by
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+the shell; this is given by the value of the system configuration
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+parameter tt(CHILD_MAX). When this limit is reached, older process IDs
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+are discarded, least recently started processes first.
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+
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+Note there is no protection against the process ID wrapping, i.e. if the
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+wait is not executed soon enough there is a chance the process waited
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+for is the wrong one. A conflict implies both process IDs have been
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+generated by the shell, as other processes are not recorded, and that
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+the user is potentially interested in both, so this problem is intrinsic
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+to process IDs.
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)
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findex(whence)
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item(tt(whence) [ tt(-vcwfpams) ] var(name) ...)(
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diff --git a/Doc/Zsh/options.yo b/Doc/Zsh/options.yo
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index 068a253..452b258 100644
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--- a/Doc/Zsh/options.yo
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+++ b/Doc/Zsh/options.yo
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@@ -1401,10 +1401,10 @@ shell is saved for output within a subshell (for example, within a
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pipeline). When the option is set, the output of tt(jobs) is empty
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until a job is started within the subshell.
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-When the option is set, it becomes possible to use the tt(wait) builtin to
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-wait for the last job started in the background (as given by tt($!)) even
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-if that job has already exited. This works even if the option is turned
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-on temporarily around the use of the tt(wait) builtin.
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+In previous versions of the shell, it was necessary to enable
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+tt(POSIX_JOBS) in order for the builtin command tt(wait) to return the
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+status of background jobs that had already exited. This is no longer
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+the case.
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)
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enditem()
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diff --git a/Doc/zshoptions.1 b/Doc/zshoptions.1
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index dc8f2f8..17f9e97 100644
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--- a/Doc/zshoptions.1
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+++ b/Doc/zshoptions.1
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@@ -867,10 +867,10 @@ shell is saved for output within a subshell (for example, within a
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pipeline)\&. When the option is set, the output of \fBjobs\fP is empty
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until a job is started within the subshell\&.
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.PP
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-When the option is set, it becomes possible to use the \fBwait\fP builtin to
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-wait for the last job started in the background (as given by \fB$!\fP) even
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-if that job has already exited\&. This works even if the option is turned
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-on temporarily around the use of the \fBwait\fP builtin\&.
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+In previous versions of the shell, it was necessary to enable
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+\fBPOSIX_JOBS\fP in order for the builtin command \fBwait\fP to return the
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+status of background jobs that had already exited\&. This is no longer
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+the case\&.
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.RE
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.RE
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.PP
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diff --git a/Src/exec.c b/Src/exec.c
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index d0fadd6..a9c4688 100644
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--- a/Src/exec.c
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+++ b/Src/exec.c
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@@ -2852,8 +2852,6 @@ execcmd(Estate state, int input, int output, int how, int last1)
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#endif
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if (how & Z_ASYNC) {
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lastpid = (zlong) pid;
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- /* indicate it's possible to set status for lastpid */
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- lastpid_status = -2L;
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} else if (!jobtab[thisjob].stty_in_env && varspc) {
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/* search for STTY=... */
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Wordcode p = varspc;
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diff --git a/Src/init.c b/Src/init.c
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index c26d887..6666f98 100644
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--- a/Src/init.c
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+++ b/Src/init.c
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@@ -1018,7 +1018,6 @@ setupvals(void)
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bufstack = znewlinklist();
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hsubl = hsubr = NULL;
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lastpid = 0;
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- lastpid_status = -1L;
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get_usage();
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diff --git a/Src/jobs.c b/Src/jobs.c
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index bd95afb..18bb648 100644
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--- a/Src/jobs.c
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+++ b/Src/jobs.c
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@@ -104,15 +104,6 @@ int prev_errflag, prev_breaks, errbrk_saved;
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/**/
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int numpipestats, pipestats[MAX_PIPESTATS];
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-/*
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- * The status associated with the process lastpid.
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- * -1 if not set and no associated lastpid
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- * -2 if lastpid is set and status isn't yet
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- * else the value returned by wait().
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- */
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-/**/
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-long lastpid_status;
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-
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/* Diff two timevals for elapsed-time computations */
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/**/
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@@ -1210,14 +1201,6 @@ addproc(pid_t pid, char *text, int aux, struct timeval *bgtime)
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{
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Process pn, *pnlist;
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- if (pid == lastpid && lastpid_status != -2L) {
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- /*
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- * The status for the previous lastpid is invalid.
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- * Presumably process numbers have wrapped.
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- */
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- lastpid_status = -1L;
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- }
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-
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DPUTS(thisjob == -1, "No valid job in addproc.");
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pn = (Process) zshcalloc(sizeof *pn);
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pn->pid = pid;
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@@ -1826,6 +1809,122 @@ maybeshrinkjobtab(void)
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unqueue_signals();
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}
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+/*
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+ * Definitions for the background process stuff recorded below.
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+ * This would be more efficient as a hash, but
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+ * - that's quite heavyweight for something not needed very often
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+ * - we need some kind of ordering as POSIX allows us to limit
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+ * the size of the list to the value of _SC_CHILD_MAX and clearly
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+ * we want to clear the oldest first
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+ * - cases with a long list of background jobs where the user doesn't
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+ * wait for a large number, and then does wait for one (the only
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+ * inefficient case) are rare
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+ * - in the context of waiting for an external process, looping
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+ * over a list isn't so very inefficient.
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+ * Enough excuses already.
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+ */
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+
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+/* Data in the link list, a key (process ID) / value (exit status) pair. */
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+struct bgstatus {
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+ pid_t pid;
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+ int status;
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+};
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+typedef struct bgstatus *Bgstatus;
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+/* The list of those entries */
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+LinkList bgstatus_list;
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+/* Count of entries. Reaches value of _SC_CHILD_MAX and stops. */
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+long bgstatus_count;
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+
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+/*
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+ * Remove and free a bgstatus entry.
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+ */
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+static void rembgstatus(LinkNode node)
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+{
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+ zfree(remnode(bgstatus_list, node), sizeof(struct bgstatus));
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+ bgstatus_count--;
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+}
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+
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+/*
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+ * Record the status of a background process that exited so we
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+ * can execute the builtin wait for it.
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+ *
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+ * We can't execute the wait builtin for something that exited in the
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+ * foreground as it's not visible to the user, so don't bother recording.
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+ */
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+
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+/**/
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+void
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+addbgstatus(pid_t pid, int status)
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+{
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+ static long child_max;
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+ Bgstatus bgstatus_entry;
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+
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+ if (!child_max) {
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+#ifdef _SC_CHILD_MAX
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+ child_max = sysconf(_SC_CHILD_MAX);
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+ if (!child_max) /* paranoia */
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+#endif
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+ {
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704a93 |
+ /* Be inventive */
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+ child_max = 1024L;
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+ }
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704a93 |
+ }
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704a93 |
+
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704a93 |
+ if (!bgstatus_list) {
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704a93 |
+ bgstatus_list = znewlinklist();
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704a93 |
+ /*
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704a93 |
+ * We're not always robust about memory failures, but
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+ * this is pretty deep in the shell basics to be failing owing
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+ * to memory, and a failure to wait is reported loudly, so test
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+ * and fail silently here.
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+ */
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+ if (!bgstatus_list)
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+ return;
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704a93 |
+ }
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704a93 |
+ if (bgstatus_count == child_max) {
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704a93 |
+ /* Overflow. List is in order, remove first */
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704a93 |
+ rembgstatus(firstnode(bgstatus_list));
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704a93 |
+ }
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704a93 |
+ bgstatus_entry = (Bgstatus)zalloc(sizeof(*bgstatus_entry));
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+ if (!bgstatus_entry) {
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+ /* See note above */
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+ return;
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+ }
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+ bgstatus_entry->pid = pid;
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+ bgstatus_entry->status = status;
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704a93 |
+ if (!zaddlinknode(bgstatus_list, bgstatus_entry)) {
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+ zfree(bgstatus_entry, sizeof(*bgstatus_entry));
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+ return;
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+ }
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+ bgstatus_count++;
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704a93 |
+}
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+
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704a93 |
+/*
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704a93 |
+ * See if pid has a recorded exit status.
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704a93 |
+ * Note we make no guarantee that the PIDs haven't wrapped, so this
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+ * may not be the right process.
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704a93 |
+ *
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704a93 |
+ * This is only used by wait, which must only work on each
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+ * pid once, so we need to remove the entry if we find it.
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+ */
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+
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704a93 |
+static int getbgstatus(pid_t pid)
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+{
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704a93 |
+ LinkNode node;
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704a93 |
+ Bgstatus bgstatus_entry;
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+
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+ if (!bgstatus_list)
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704a93 |
+ return -1;
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704a93 |
+ for (node = firstnode(bgstatus_list); node; incnode(node)) {
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704a93 |
+ bgstatus_entry = (Bgstatus)getdata(node);
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704a93 |
+ if (bgstatus_entry->pid == pid) {
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704a93 |
+ int status = bgstatus_entry->status;
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+ rembgstatus(node);
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704a93 |
+ return status;
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+ }
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+ }
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+ return -1;
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704a93 |
+}
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704a93 |
|
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704a93 |
/* bg, disown, fg, jobs, wait: most of the job control commands are *
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704a93 |
* here. They all take the same type of argument. Exception: wait can *
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704a93 |
@@ -1971,10 +2070,7 @@ bin_fg(char *name, char **argv, Options ops, int func)
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704a93 |
}
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704a93 |
if (retval == 0)
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704a93 |
retval = lastval2;
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|
704a93 |
- } else if (isset(POSIXJOBS) &&
|
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704a93 |
- pid == lastpid && lastpid_status >= 0L) {
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|
704a93 |
- retval = (int)lastpid_status;
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704a93 |
- } else {
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|
704a93 |
+ } else if ((retval = getbgstatus(pid)) < 0) {
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704a93 |
zwarnnam(name, "pid %d is not a child of this shell", pid);
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704a93 |
/* presumably lastval2 doesn't tell us a heck of a lot? */
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704a93 |
retval = 1;
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704a93 |
diff --git a/Src/linklist.c b/Src/linklist.c
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704a93 |
index 1e364fb..3aa8125 100644
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704a93 |
--- a/Src/linklist.c
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704a93 |
+++ b/Src/linklist.c
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|
704a93 |
@@ -118,6 +118,8 @@ znewlinklist(void)
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704a93 |
LinkList list;
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|
704a93 |
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|
704a93 |
list = (LinkList) zalloc(sizeof *list);
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704a93 |
+ if (!list)
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|
704a93 |
+ return NULL;
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|
704a93 |
list->list.first = NULL;
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|
704a93 |
list->list.last = &list->node;
|
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|
704a93 |
list->list.flags = 0;
|
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|
704a93 |
@@ -152,6 +154,8 @@ zinsertlinknode(LinkList list, LinkNode node, void *dat)
|
|
|
704a93 |
|
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|
704a93 |
tmp = node->next;
|
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|
704a93 |
node->next = new = (LinkNode) zalloc(sizeof *tmp);
|
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|
704a93 |
+ if (!new)
|
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|
704a93 |
+ return NULL;
|
|
|
704a93 |
new->prev = node;
|
|
|
704a93 |
new->dat = dat;
|
|
|
704a93 |
new->next = tmp;
|
|
|
704a93 |
diff --git a/Src/signals.c b/Src/signals.c
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|
|
704a93 |
index 2df69f9..e728505 100644
|
|
|
704a93 |
--- a/Src/signals.c
|
|
|
704a93 |
+++ b/Src/signals.c
|
|
|
704a93 |
@@ -520,14 +520,14 @@ wait_for_processes(void)
|
|
|
704a93 |
get_usage();
|
|
|
704a93 |
}
|
|
|
704a93 |
/*
|
|
|
704a93 |
- * Remember the status associated with $!, so we can
|
|
|
704a93 |
- * wait for it even if it's exited. This value is
|
|
|
704a93 |
- * only used if we can't find the PID in the job table,
|
|
|
704a93 |
- * so it doesn't matter that the value we save here isn't
|
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|
704a93 |
- * useful until the process has exited.
|
|
|
704a93 |
+ * Accumulate a list of older jobs. We only do this for
|
|
|
704a93 |
+ * background jobs, which is something in the job table
|
|
|
704a93 |
+ * that's not marked as in the current shell or as shell builtin
|
|
|
704a93 |
+ * and is not equal to the current foreground job.
|
|
|
704a93 |
*/
|
|
|
704a93 |
- if (pn != NULL && pid == lastpid && lastpid_status != -1L)
|
|
|
704a93 |
- lastpid_status = lastval2;
|
|
|
704a93 |
+ if (jn && !(jn->stat & (STAT_CURSH|STAT_BUILTIN)) &&
|
|
|
704a93 |
+ jn - jobtab != thisjob)
|
|
|
704a93 |
+ addbgstatus(pid, (int)lastval2);
|
|
|
704a93 |
}
|
|
|
704a93 |
}
|
|
|
704a93 |
|
|
|
704a93 |
--
|
|
|
704a93 |
2.1.0
|
|
|
704a93 |
|
|
|
704a93 |
|
|
|
704a93 |
From 2d59469450ba80b69449dc2777f0fc0673e0fbd6 Mon Sep 17 00:00:00 2001
|
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|
704a93 |
From: Peter Stephenson <p.w.stephenson@ntlworld.com>
|
|
|
704a93 |
Date: Sun, 26 Oct 2014 19:04:47 +0000
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|
|
704a93 |
Subject: [PATCH 2/2] 33542: test logic for waiting for already exited
|
|
|
704a93 |
processes
|
|
|
704a93 |
|
|
|
704a93 |
Upstream-commit: 9a551ca85999ff329714fd2cca138ce2f7d3c3d9
|
|
|
704a93 |
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
|
|
|
704a93 |
---
|
|
|
704a93 |
Test/A05execution.ztst | 29 +++++++++++++++++++++++++++--
|
|
|
704a93 |
1 file changed, 27 insertions(+), 2 deletions(-)
|
|
|
704a93 |
|
|
|
704a93 |
diff --git a/Test/A05execution.ztst b/Test/A05execution.ztst
|
|
|
704a93 |
index ca97f4f..589815f 100644
|
|
|
704a93 |
--- a/Test/A05execution.ztst
|
|
|
704a93 |
+++ b/Test/A05execution.ztst
|
|
|
704a93 |
@@ -178,3 +178,28 @@
|
|
|
704a93 |
kill $!
|
|
|
704a93 |
0:Status reset by starting a backgrounded command
|
|
|
704a93 |
>0
|
|
|
704a93 |
+
|
|
|
704a93 |
+# This tests that we record the status of processes that have already exited
|
|
|
704a93 |
+# for when we wait for them.
|
|
|
704a93 |
+#
|
|
|
704a93 |
+# Actually, we don't guarantee here that the jobs have already exited, but
|
|
|
704a93 |
+# the order of the waits means it's highly likely we do need to recall a
|
|
|
704a93 |
+# previous status, barring accidents which shouldn't happen very often. In
|
|
|
704a93 |
+# other words, we rely on the test working repeatedly rather than just
|
|
|
704a93 |
+# once. The monitor option is irrelevant to the logic, so we'll make
|
|
|
704a93 |
+# our job easier by turning it off.
|
|
|
704a93 |
+ unsetopt monitor
|
|
|
704a93 |
+ (exit 1) &
|
|
|
704a93 |
+ one=$!
|
|
|
704a93 |
+ (exit 2) &
|
|
|
704a93 |
+ two=$!
|
|
|
704a93 |
+ (exit 3) &
|
|
|
704a93 |
+ three=$!
|
|
|
704a93 |
+ wait $three
|
|
|
704a93 |
+ print $?
|
|
|
704a93 |
+ wait $two
|
|
|
704a93 |
+ print $?
|
|
|
704a93 |
+ wait $one
|
|
|
704a93 |
+1:The status of recently exited background jobs is recorded
|
|
|
704a93 |
+>3
|
|
|
704a93 |
+>2
|
|
|
704a93 |
--
|
|
|
704a93 |
2.1.0
|
|
|
704a93 |
|