X-Git-Url: http://www.git.stargrave.org/?a=blobdiff_plain;f=lib%2FPublicInbox%2FSpawn.pm;h=e2868a559741b2416cdbba9960bf598434577c08;hb=9bd675d33ad1e49bd2ebe12a1d216216e61380de;hp=fd9816082188dc8265bdad89a1449e5e9cbe73ee;hpb=89be7a1b89a60446fc0a385c5c1cfaeec2f92c88;p=public-inbox.git
diff --git a/lib/PublicInbox/Spawn.pm b/lib/PublicInbox/Spawn.pm
index fd981608..e2868a55 100644
--- a/lib/PublicInbox/Spawn.pm
+++ b/lib/PublicInbox/Spawn.pm
@@ -1,4 +1,4 @@
-# Copyright (C) 2016-2018 all contributors
+# Copyright (C) 2016-2019 all contributors
# License: AGPL-3.0+
#
# This allows vfork to be used for spawning subprocesses if
@@ -26,22 +26,35 @@ my $vfork_spawn = <<'VFORK_SPAWN';
#include
#include
#include
-#include
-#include
-#include
+#include
-#define AV_ALLOCA(av, max) alloca((max = (av_len((av)) + 1)) * sizeof(char *))
+/* some platforms need alloca.h, but some don't */
+#if defined(__GNUC__) && !defined(alloca)
+# define alloca(sz) __builtin_alloca(sz)
+#endif
-static void av2c_copy(char **dst, AV *src, I32 max)
-{
- I32 i;
+#include
+#include
- for (i = 0; i < max; i++) {
- SV **sv = av_fetch(src, i, 0);
- dst[i] = sv ? SvPV_nolen(*sv) : 0;
- }
- dst[max] = 0;
-}
+/*
+ * From the av_len apidoc:
+ * Note that, unlike what the name implies, it returns
+ * the highest index in the array, so to get the size of
+ * the array you need to use "av_len(av) + 1".
+ * This is unlike "sv_len", which returns what you would expect.
+ */
+#define AV2C_COPY(dst, src) do { \
+ I32 i; \
+ I32 top_index = av_len(src); \
+ I32 real_len = top_index + 1; \
+ I32 capa = real_len + 1; \
+ dst = alloca(capa * sizeof(char *)); \
+ for (i = 0; i < real_len; i++) { \
+ SV **sv = av_fetch(src, i, 0); \
+ dst[i] = SvPV_nolen(*sv); \
+ } \
+ dst[real_len] = 0; \
+} while (0)
static void *deconst(const char *s)
{
@@ -86,15 +99,11 @@ int pi_fork_exec(int in, int out, int err,
const char *filename = SvPV_nolen(file);
pid_t pid;
char **argv, **envp;
- I32 max;
sigset_t set, old;
int ret, errnum;
- argv = AV_ALLOCA(cmd, max);
- av2c_copy(argv, cmd, max);
-
- envp = AV_ALLOCA(env, max);
- av2c_copy(envp, env, max);
+ AV2C_COPY(argv, cmd);
+ AV2C_COPY(envp, env);
ret = sigfillset(&set);
assert(ret == 0 && "BUG calling sigfillset");
@@ -205,18 +214,12 @@ sub spawn ($;$$) {
foreach my $l (RLIMITS()) {
defined(my $v = $opts->{$l}) or next;
- my ($soft, $hard);
- if (ref($v)) {
- ($soft, $hard) = @$v;
- } else {
- $soft = $hard = $v;
- }
my $r = eval "require BSD::Resource; BSD::Resource::$l();";
unless (defined $r) {
warn "$l undefined by BSD::Resource: $@\n";
next;
}
- push @$rlim, $r, $soft, $hard;
+ push @$rlim, $r, @$v;
}
my $pid = pi_fork_exec($in, $out, $err, $f, $cmd, \@env, $rlim);
$pid < 0 ? undef : $pid;
@@ -226,8 +229,6 @@ sub popen_rd {
my ($cmd, $env, $opts) = @_;
pipe(my ($r, $w)) or die "pipe: $!\n";
$opts ||= {};
- my $blocking = $opts->{Blocking};
- IO::Handle::blocking($r, $blocking) if defined $blocking;
$opts->{1} = fileno($w);
my $pid = spawn($cmd, $env, $opts);
return unless defined $pid;