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Re: Anyone familiar with auto-fu.zsh project?
On Mon, 11 Jun 2018 19:55:32 -0600
Eric Freese <ericdfreese@xxxxxxxxx> wrote:
> Do you know if there is any way to get the PID of the process spawned
> for process substitution? It looks like `$!` doesn't hold it as it
> does in bash.
Hmm, this is obviously useful but I'd be loath simply to make $! do this
as the fact there's an asynchronous process involved is a bit hidden and
the mechanism is rather different from creating a background job, so
that could be confusing.
We could add it to the $sysparams hash provided by the zsh/system
module? This already contains some PID information. (It's
not strictly a system parameter but I don't think anyone's
going to hold a gun to my head and tell me this hash can only
return the result of immediate system calls.)
pws
diff --git a/Doc/Zsh/mod_system.yo b/Doc/Zsh/mod_system.yo
index 7f2009b..a27bab4 100644
--- a/Doc/Zsh/mod_system.yo
+++ b/Doc/Zsh/mod_system.yo
@@ -255,6 +255,11 @@ Returns the process ID of the parent of the current process, even in
subshells. Compare tt($PPID), which returns the process ID of the parent
of the main shell process.
)
+item(tt(procsubstpid))(
+Returns the process ID of the last process started for process
+substitution, i.e. the tt(<LPAR())var(...)tt(RPAR()) and
+tt(>LPAR())var(...)tt(RPAR()) expansions.
+)
enditem()
)
enditem()
diff --git a/Src/Modules/system.c b/Src/Modules/system.c
index 9fd4d25..7a4f4ee 100644
--- a/Src/Modules/system.c
+++ b/Src/Modules/system.c
@@ -772,6 +772,8 @@ fillpmsysparams(Param pm, const char *name)
num = (int)getpid();
} else if (!strcmp(name, "ppid")) {
num = (int)getppid();
+ } else if (!strcmp(name, "procsubstpid")) {
+ num = (int)procsubstpid;
} else {
pm->u.str = dupstring("");
pm->node.flags |= PM_UNSET;
@@ -805,6 +807,8 @@ scanpmsysparams(UNUSED(HashTable ht), ScanFunc func, int flags)
func(&spm.node, flags);
fillpmsysparams(&spm, "ppid");
func(&spm.node, flags);
+ fillpmsysparams(&spm, "procsubstpid");
+ func(&spm.node, flags);
}
static struct mathfunc mftab[] = {
diff --git a/Src/exec.c b/Src/exec.c
index 963b0a5..d445278 100644
--- a/Src/exec.c
+++ b/Src/exec.c
@@ -174,6 +174,11 @@ mod_export int zleactive;
/**/
pid_t cmdoutpid;
+/* pid of last process started by <(...), >(...) */
+
+/**/
+mod_export pid_t procsubstpid;
+
/* exit status of process undergoing 'process substitution' */
/**/
@@ -4850,6 +4855,7 @@ getproc(char *cmd, char **eptr)
return NULL;
if (!out)
addproc(pid, NULL, 1, &bgtime);
+ procsubstpid = pid;
return pnam;
}
closem(FDT_UNUSED, 0);
@@ -4887,6 +4893,7 @@ getproc(char *cmd, char **eptr)
{
addproc(pid, NULL, 1, &bgtime);
}
+ procsubstpid = pid;
return pnam;
}
entersubsh(ESUB_ASYNC|ESUB_PGRP);
@@ -4937,6 +4944,7 @@ getpipe(char *cmd, int nullexec)
}
if (!nullexec)
addproc(pid, NULL, 1, &bgtime);
+ procsubstpid = pid;
return pipes[!out];
}
entersubsh(ESUB_PGRP);
@@ -6172,6 +6180,7 @@ execsave(void)
es->cmdoutpid = cmdoutpid;
es->cmdoutval = cmdoutval;
es->use_cmdoutval = use_cmdoutval;
+ es->procsubstpid = procsubstpid;
es->trap_return = trap_return;
es->trap_state = trap_state;
es->trapisfunc = trapisfunc;
@@ -6207,6 +6216,7 @@ execrestore(void)
cmdoutpid = en->cmdoutpid;
cmdoutval = en->cmdoutval;
use_cmdoutval = en->use_cmdoutval;
+ procsubstpid = en->procsubstpid;
trap_return = en->trap_return;
trap_state = en->trap_state;
trapisfunc = en->trapisfunc;
diff --git a/Src/zsh.h b/Src/zsh.h
index 8535d48..8e7f20b 100644
--- a/Src/zsh.h
+++ b/Src/zsh.h
@@ -1095,6 +1095,7 @@ struct execstack {
pid_t cmdoutpid;
int cmdoutval;
int use_cmdoutval;
+ pid_t procsubstpid;
int trap_return;
int trap_state;
int trapisfunc;
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