如何设置 SA_ONSTACK 标志

对于一个Golang开发者来说，牢固扎实的基础是十分重要的，golang学习网就来带大家一点点的掌握基础知识点。今天本篇文章带大家了解《如何设置 SA_ONSTACK 标志》，主要介绍了，希望对大家的知识积累有所帮助，快点收藏起来吧，否则需要时就找不到了！

my go 应用程序连接到 ibm mq。

当我的应用程序抛出分段违规错误（信号 sigsegv）时，ibm mq 注册的信号处理程序使我的应用程序抛出“非 go 代码设置没有 sa_onstack 标志的信号处理程序”。

那么我该如何设置该标志呢？

我的代码

package main

import (
    "fmt"
    "github.com/ibm-messaging/mq-golang/ibmmq"
)

type a struct {
    str string
}

type b struct {
    apointer *a
}

func main() {
    connectibmmq()

    b := b{}
    fmt.println(b.apointer.str)
}

const (
    qmgrname       = `qmgrname`
    channelname    = `channelname`
    connectionname = `0.0.0.0(1416)`
    username       = `username`
    password       = `password`
)

func connectibmmq() {
    mqcd := ibmmq.newmqcd()
    mqcd.channelname = channelname
    mqcd.connectionname = connectionname

    csp := ibmmq.newmqcsp()
    csp.authenticationtype = ibmmq.mqcsp_auth_user_id_and_pwd
    csp.userid = username
    csp.password = password

    cno := ibmmq.newmqcno()
    cno.clientconn = mqcd
    cno.options = ibmmq.mqcno_client_binding + ibmmq.mqcno_reconnect + ibmmq.mqcno_handle_share_block
    cno.securityparms = csp

    ibmmq.connx(qmgrname, cno)
}

参考

https://www.ibm.com/support/knowledgecenter/en/ssfksj_9.1.0/com.ibm.mq.dev.doc/q025880_.htm https://golang.org/pkg/os/signal/#hdr-go_programs_that_use_cgo_or_swig

完全错误

signal 11 received but handler not on signal stack
fatal error: non-Go code set up signal handler without SA_ONSTACK flag

runtime stack:
runtime: unexpected return pc for runtime.sigtramp called from 0x7f60f6e9a517
stack: frame={sp:0xc000046628, fp:0xc000046680} stack=[0xc00003e578,0xc000046978)
000000c000046528:  000000c000046530  00000000004549a0 <runtime.throw.func1+0> 
000000c000046538:  00000000004e2c3b  0000000000000039 
000000c000046548:  000000c000046568  00000000004415df <runtime.sigNotOnStack+127> 
000000c000046558:  00000000004e2c3b  0000000000000039 
000000c000046568:  000000c000046618  0000000000440c6d <runtime.sigtrampgo+749> 
000000c000046578:  000000000000000b  000000c000046600 
000000c000046588:  000000c000046880  0000000000000000 
000000c000046598:  0000000000000000  000000c000046628 
000000c0000465a8:  0000000000000000  0000000000000000 
000000c0000465b8:  0000000000000000  0000000000000000 
000000c0000465c8:  0000000000000000  000000c000000180 
000000c0000465d8:  0000000000000000  ffffffffffffffff 
000000c0000465e8:  0000000000000000  0000000000000000 
000000c0000465f8:  0000000000000000  000000c000002000 
000000c000046608:  0000000000000000  0000000000008000 
000000c000046618:  000000c000046670  0000000000459a33 <runtime.sigtramp+67> 
000000c000046628: <000000000000000b  000000c0000469b0 
000000c000046638:  000000c000046880  000000c000046880 
000000c000046648:  000000c0000469b0  0000000000000000 
000000c000046658:  000000000000000b  000000c000046670 
000000c000046668:  00007f60f78213c0  000000000262e400 
000000c000046678: !00007f60f6e9a517 >000000c000046690 
000000c000046688:  8e26f8f48c919100  0000000000000000 
000000c000046698:  0000000000000000  0000000000000008 
000000c0000466a8:  0000000000000000  000000c000000180 
000000c0000466b8:  0000000000000000  0000000000000000 
000000c0000466c8:  0000000000000000  0000000000000000 
000000c0000466d8:  0000000000000000  0000000000000000 
000000c0000466e8:  0000000000000000  0000000000000000 
000000c0000466f8:  0000000000000000  0000000000000000 
000000c000046708:  0000000000000000  0000000000000000 
000000c000046718:  0000000000000000  000000c000046f88 
000000c000046728:  0000000000000004  0000000000000012 
000000c000046738:  00000000004f21e1  0000000000000000 
000000c000046748:  00007f60f6e9b45a  0000000000000000 
000000c000046758:  0000000000000000  0000000000000000 
000000c000046768:  0000000000000000  0000000000000000 
000000c000046778:  0000000000000000 
runtime.throw(0x4e2c3b, 0x39)
    /usr/local/go/src/runtime/panic.go:617 +0x72
runtime.sigNotOnStack(0xb)
    /usr/local/go/src/runtime/signal_unix.go:576 +0x7f
runtime.sigtrampgo(0xb, 0xc0000469b0, 0xc000046880)
    /usr/local/go/src/runtime/signal_unix.go:334 +0x2ed
runtime: unexpected return pc for runtime.sigtramp called from 0x7f60f6e9a517
stack: frame={sp:0xc000046628, fp:0xc000046680} stack=[0xc00003e578,0xc000046978)
000000c000046528:  000000c000046530  00000000004549a0 <runtime.throw.func1+0> 
000000c000046538:  00000000004e2c3b  0000000000000039 
000000c000046548:  000000c000046568  00000000004415df <runtime.sigNotOnStack+127> 
000000c000046558:  00000000004e2c3b  0000000000000039 
000000c000046568:  000000c000046618  0000000000440c6d <runtime.sigtrampgo+749> 
000000c000046578:  000000000000000b  000000c000046600 
000000c000046588:  000000c000046880  0000000000000000 
000000c000046598:  0000000000000000  000000c000046628 
000000c0000465a8:  0000000000000000  0000000000000000 
000000c0000465b8:  0000000000000000  0000000000000000 
000000c0000465c8:  0000000000000000  000000c000000180 
000000c0000465d8:  0000000000000000  ffffffffffffffff 
000000c0000465e8:  0000000000000000  0000000000000000 
000000c0000465f8:  0000000000000000  000000c000002000 
000000c000046608:  0000000000000000  0000000000008000 
000000c000046618:  000000c000046670  0000000000459a33 <runtime.sigtramp+67> 
000000c000046628: <000000000000000b  000000c0000469b0 
000000c000046638:  000000c000046880  000000c000046880 
000000c000046648:  000000c0000469b0  0000000000000000 
000000c000046658:  000000000000000b  000000c000046670 
000000c000046668:  00007f60f78213c0  000000000262e400 
000000c000046678: !00007f60f6e9a517 >000000c000046690 
000000c000046688:  8e26f8f48c919100  0000000000000000 
000000c000046698:  0000000000000000  0000000000000008 
000000c0000466a8:  0000000000000000  000000c000000180 
000000c0000466b8:  0000000000000000  0000000000000000 
000000c0000466c8:  0000000000000000  0000000000000000 
000000c0000466d8:  0000000000000000  0000000000000000 
000000c0000466e8:  0000000000000000  0000000000000000 
000000c0000466f8:  0000000000000000  0000000000000000 
000000c000046708:  0000000000000000  0000000000000000 
000000c000046718:  0000000000000000  000000c000046f88 
000000c000046728:  0000000000000004  0000000000000012 
000000c000046738:  00000000004f21e1  0000000000000000 
000000c000046748:  00007f60f6e9b45a  0000000000000000 
000000c000046758:  0000000000000000  0000000000000000 
000000c000046768:  0000000000000000  0000000000000000 
000000c000046778:  0000000000000000 
runtime.sigtramp(0xc000046690, 0x8e26f8f48c919100, 0x0, 0x0, 0x8, 0x0, 0xc000000180, 0x0, 0x0, 0x0, ...)
    /usr/local/go/src/runtime/sys_linux_amd64.s:357 +0x43

goroutine 17 [syscall, locked to thread]:
runtime.goexit()
    /usr/local/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc00004afe8 sp=0xc00004afe0 pc=0x457e41

goroutine 1 [running]:
    goroutine running on other thread; stack unavailable

解决方案

您可以尝试设置环境变量“MQS_NO_SYNC_SIGNAL_HANDLING=true”来禁用MQ的某些信号设置。这至少可以让我们更好地了解 SEGV 的来源。

终于介绍完啦！小伙伴们，这篇关于《如何设置 SA_ONSTACK 标志》的介绍应该让你收获多多了吧！欢迎大家收藏或分享给更多需要学习的朋友吧~golang学习网公众号也会发布Golang相关知识，快来关注吧！