From 500892f115aea9788da7649b59baaea38729aacf Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Sat, 9 Sep 2017 12:06:59 -0400
Subject: Try /proc/self/fd before /dev/fd

On Solaris, /proc/self/fd is dynamic while /dev/fd is static.
---
 eval.c   |  9 ++++++---
 tests.sh | 10 ++++++++--
 2 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/eval.c b/eval.c
index a387bdc..6c25e18 100644
--- a/eval.c
+++ b/eval.c
@@ -1147,9 +1147,12 @@ static int infer_fdlimit(const struct cmdline *cmdline) {
 	// 3 for std{in,out,err}
 	int nopen = 3 + cmdline->nopen_files;
 
-	// Check /dev/fd for the current number of open fds, if possible (we may
-	// have inherited more than just the standard ones)
-	DIR *dir = opendir("/dev/fd");
+	// Check /proc/self/fd for the current number of open fds, if possible
+	// (we may have inherited more than just the standard ones)
+	DIR *dir = opendir("/proc/self/fd");
+	if (!dir) {
+		dir = opendir("/dev/fd");
+	}
 	if (dir) {
 		// Account for 'dir' itself
 		nopen = -1;
diff --git a/tests.sh b/tests.sh
index f4d4107..d664793 100755
--- a/tests.sh
+++ b/tests.sh
@@ -510,12 +510,18 @@ function bfs_diff() (
 )
 
 function closefrom() {
-    for fd in /dev/fd/*; do
+    if [ -d /proc/self/fd ]; then
+        local fds=/proc/self/fd
+    else
+        local fds=/dev/fd
+    fi
+
+    for fd in "$fds"/*; do
         if [ ! -e "$fd" ]; then
             continue
         fi
 
-        fd="${fd##*/}"
+        local fd="${fd##*/}"
         if [ "$fd" -ge "$1" ]; then
             eval "exec ${fd}<&-"
         fi
-- 
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