tor

commit c894e9d3d44bceaf209a9b73c2c43911af3eb1a8
parent f5092e711fb08dfdf7a356f8c58f10effe6fb831
Author: Nick Mathewson <nickm@torproject.org>
Date:   Mon, 11 Sep 2017 16:29:10 -0400

Merge branch 'maint-0.2.9' into maint-0.3.0

Diffstat:
A
changes/bug22797
 | 
4
++++
M
src/common/compat.c
 | 
19
++++++++++++-------

2 files changed, 16 insertions(+), 7 deletions(-)
diff --git a/changes/bug22797 b/changes/bug22797
@@ -0,0 +1,4 @@
+  o Minor bugfixes (file limits):
+    - When setting the maximum number of connections allowed by the OS,
+      always allow some extra file descriptors for other files.
+      Fixes bug 22797; bugfix on 0.2.0.10-alpha.
diff --git a/src/common/compat.c b/src/common/compat.c
@@ -1732,19 +1732,24 @@ set_max_file_descriptors(rlim_t limit, int *max_out)
   if (setrlimit(RLIMIT_NOFILE, &rlim) != 0) {
     int bad = 1;
 #ifdef OPEN_MAX
-    if (errno == EINVAL && OPEN_MAX < rlim.rlim_cur) {
+    uint64_t try_limit = OPEN_MAX - ULIMIT_BUFFER;
+    if (errno == EINVAL && try_limit < (uint64_t) rlim.rlim_cur) {
       /* On some platforms, OPEN_MAX is the real limit, and getrlimit() is
        * full of nasty lies.  I'm looking at you, OSX 10.5.... */
-      rlim.rlim_cur = OPEN_MAX;
+      rlim.rlim_cur = try_limit;
       if (setrlimit(RLIMIT_NOFILE, &rlim) == 0) {
         if (rlim.rlim_cur < (rlim_t)limit) {
           log_warn(LD_CONFIG, "We are limited to %lu file descriptors by "
-                 "OPEN_MAX, and ConnLimit is %lu.  Changing ConnLimit; sorry.",
-                   (unsigned long)OPEN_MAX, (unsigned long)limit);
+                   "OPEN_MAX (%lu), and ConnLimit is %lu.  Changing "
+                   "ConnLimit; sorry.",
+                   (unsigned long)try_limit, (unsigned long)OPEN_MAX,
+                   (unsigned long)limit);
         } else {
-          log_info(LD_CONFIG, "Dropped connection limit to OPEN_MAX (%lu); "
-                   "Apparently, %lu was too high and rlimit lied to us.",
-                   (unsigned long)OPEN_MAX, (unsigned long)rlim.rlim_max);
+          log_info(LD_CONFIG, "Dropped connection limit to %lu based on "
+                   "OPEN_MAX (%lu); Apparently, %lu was too high and rlimit "
+                   "lied to us.",
+                   (unsigned long)try_limit, (unsigned long)OPEN_MAX,
+                   (unsigned long)rlim.rlim_max);
         }
         bad = 0;
       }