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Increase the open file soft limit to the hard limit #15205

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Merged
edolstra merged 1 commit into from
Feb 11, 2026
Merged

Increase the open file soft limit to the hard limit #15205

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23 changes: 23 additions & 0 deletions src/libmain/shared.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@
#include <cstdlib>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/resource.h>
#include <unistd.h>
#include <signal.h>
#ifdef __linux__
Expand Down Expand Up @@ -117,6 +118,26 @@ std::string getArg(const std::string & opt, Strings::iterator & i, const Strings
static void sigHandler(int signo) {}
#endif

/**
* Increase the open file soft limit to the hard limit. On some
* platforms (macOS), the default soft limit is very low, but the hard
* limit is high. So let's just raise it the maximum permitted.
*/
void bumpFileLimit()
{
#ifndef _WIN32
struct rlimit limit;
if (getrlimit(RLIMIT_NOFILE, &limit) != 0)
return;

if (limit.rlim_cur < limit.rlim_max) {
limit.rlim_cur = limit.rlim_max;
// Ignore errors, this is best effort.
setrlimit(RLIMIT_NOFILE, &limit);
}
#endif
}

void initNix(bool loadConfig)
{
/* Turn on buffering for cerr. */
Expand Down Expand Up @@ -184,6 +205,8 @@ void initNix(bool loadConfig)
now. In particular, store objects should be readable by
everybody. */
umask(0022);

bumpFileLimit();
}

LegacyArgs::LegacyArgs(
Expand Down
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