5c949d3b3b
Package fdtrack logs statistics about open file descriptors. This should help identify the source of #1549.
73 lines
2.0 KiB
Go
73 lines
2.0 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// +build darwin
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package fdtrack
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import (
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"os"
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"syscall"
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"unsafe"
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)
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// #cgo CFLAGS: -lproc
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// #include <libproc.h>
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// #include <stdlib.h>
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import "C"
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func fdlimit() int {
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var nofile syscall.Rlimit
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if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &nofile); err != nil {
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return 0
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}
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return int(nofile.Cur)
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}
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func fdusage() (int, error) {
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pid := C.int(os.Getpid())
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// Query for a rough estimate on the amout of data that
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// proc_pidinfo will return.
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rlen, err := C.proc_pidinfo(pid, C.PROC_PIDLISTFDS, 0, nil, 0)
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if rlen <= 0 {
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return 0, err
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}
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// Load the list of file descriptors. We don't actually care about
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// the content, only about the size. Since the number of fds can
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// change while we're reading them, the loop enlarges the buffer
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// until proc_pidinfo says the result fitted.
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var buf unsafe.Pointer
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defer func() {
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if buf != nil {
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C.free(buf)
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}
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}()
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for buflen := rlen; ; buflen *= 2 {
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buf, err = C.reallocf(buf, C.size_t(buflen))
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if buf == nil {
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return 0, err
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}
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rlen, err = C.proc_pidinfo(pid, C.PROC_PIDLISTFDS, 0, buf, buflen)
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if rlen <= 0 {
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return 0, err
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} else if rlen == buflen {
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continue
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}
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return int(rlen / C.PROC_PIDLISTFD_SIZE), nil
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}
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panic("unreachable")
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}
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