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os: raise maximum file descriptor limit 

Do a binary search for the maximum RLIMIT_NOFILE.

Patch lifted from node.js commit
6820054d2d42ff9274ea0755bea59cfc4f26f353
master
Andrew Kelley 2019-09-05 15:09:13 -04:00
parent 2045b4d932
commit b564e7ca59
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1 changed files with 24 additions and 0 deletions
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24
src/os.cpp
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@ -45,6 +45,7 @@ typedef SSIZE_T ssize_t;
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/resource.h>
#include <fcntl.h>
#include <limits.h>
#include <spawn.h>
@ -1374,6 +1375,29 @@ int os_init(void) {
#elif defined(__MACH__)
host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &macos_monotonic_clock);
host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &macos_calendar_clock);
#endif
#if defined(ZIG_OS_POSIX)
// Raise the open file descriptor limit.
// Code lifted from node.js
struct rlimit lim;
if (getrlimit(RLIMIT_NOFILE, &lim) == 0 && lim.rlim_cur != lim.rlim_max) {
// Do a binary search for the limit.
rlim_t min = lim.rlim_cur;
rlim_t max = 1 << 20;
// But if there's a defined upper bound, don't search, just set it.
if (lim.rlim_max != RLIM_INFINITY) {
min = lim.rlim_max;
max = lim.rlim_max;
}
do {
lim.rlim_cur = min + (max - min) / 2;
if (setrlimit(RLIMIT_NOFILE, &lim)) {
max = lim.rlim_cur;
} else {
min = lim.rlim_cur;
}
} while (min + 1 < max);
}
#endif
return 0;
}