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Always allow extra file descriptors when setting the connection maximum

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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.
This commit is contained in:
teor 2017-07-03 15:30:52 +10:00 committed by Nick Mathewson
parent ccae991662
commit 878e0d45a5
2 changed files with 16 additions and 7 deletions
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4
changes/bug22797 Normal file
View File

@ -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.

19
src/common/compat.c
View File

@ -1568,19 +1568,24 @@ 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 < 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;
}