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如题，linux下调用pppd进行拨号，有时候会出现pppd中断后再重新设置串口会返回No such devices or address的问题。
平台：AT公司的9G20 + linux-2.6.27版本内核；
pppd版本：2.4.4；
GPRS模块：泰利特公司的GC864模块。
pppd拨号脚本如下：
#/etc/ppp/peers/gprs
# This is pppd script for China Mobile, used Huawei GTM900-B GPRS Module
# Usage: root>pppd call gprs
/dev/ttyS1
115200
nocrtscts
modem
#noauth
debug
nodetach
#hide-password
usepeerdns
noipdefault
defaultroute
user "3GNET"
0.0.0.0:0.0.0.0
#ipcp-accept-local
#ipcp-accept-remote
#lcp-echo-failure 12
#lcp-echo-interval 3
#noccp
#novj
#novjccomp
#persist
connect '/mnt/iRTK/bin/chat -s -v -f /etc/ppp/gprs-connect-chat'
#connect '/usr/sbin/chat -s -v -f /etc/ppp/gprs-connect-chat'
#connect '/bin/chat -v -s -f /etc/ppp/gprs-connect-chat
#disconnect '/bin/chat -v -f /etc/ppp/gprs-disconnect-chat'
-----------------------------------------------------------------------------------
chat命令脚本如下：
#/etc/ppp/gprs-connect-chat
# chat script for China Mobile, used HuaWei GTM900-B GPRS module.
TIMEOUT 15
ABORT "DELAYED"
ABORT "BUSY"
ABORT "ERROR"
ABORT "NO DIALTONE"
ABORT "NO CARRIER"
TIMEOUT 40
'' \rAT
OK ATS0=0
OK ATE0V1
OK AT+CGDCONT=1,"IP","3GNET"
OK ATDT*99***1#
CONNECT ''
-----------------------------------------------------------------------------------
拨号过程打印信息如下：
timeout set to 15 seconds
abort on (DELAYED)
abort on (BUSY)
abort on (ERROR)
abort on (NO DIALTONE)
abort on (NO CARRIER)
timeout set to 40 seconds
send (^MAT^M)
expect (OK)
^M
OK
-- got it
send (ATS0=0^M)
expect (OK)
^M
^M
OK
-- got it
send (ATE0V1^M)
expect (OK)
^M
^M
OK
-- got it
send (AT+CGDCONT=1,"IP","3GNET"^M)
expect (OK)
^M
^M
OK
-- got it
send (ATDT*99***1#^M)
expect (CONNECT)
^M
^M
CONNECT
-- got it
send (^M)
Serial connection established.
using channel 1
Using interface ppp0
Connect: ppp0 <--> /dev/ttyS1
Warning - secret file /etc/ppp/pap-secrets has world and/or group access
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x9654b07c> <pcomp> <accomp>]
rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x9654b07c> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x1 <asyncmap 0x0> <auth pap> <magic 0xcc6e0000> <pcomp> <accomp>]
sent [LCP ConfAck id=0x1 <asyncmap 0x0> <auth pap> <magic 0xcc6e0000> <pcomp> <accomp>]
Warning - secret file /etc/ppp/pap-secrets has world and/or group access
sent [PAP AuthReq id=0x1 user="3GNET" password=<hidden>]
rcvd [PAP AuthAck id=0x1 "Welcome!"]
Remote message: Welcome!
PAP authentication succeeded
sent [CCP ConfReq id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
sent [IPCP ConfReq id=0x1 <compress VJ 0f 01> <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>]
rcvd [IPCP ConfReq id=0x1 <addr 192.168.202.0>]
sent [IPCP ConfAck id=0x1 <addr 192.168.202.0>]
rcvd [LCP ProtRej id=0x1 80 fd 01 01 00 0f 1a 04 78 00 18 04 78 00 15 03 2f]
Protocol-Reject for 'Compression Control Protocol' (0x80fd) received
Modem hangup
Connection terminated.
打印上述信息之后，程序会kill掉pppd进程。重新调用open去打开串口是正常的，但调用tcsetattr函数去设置串口参数的时候，会返回No such devices or address的错误。但此时/dev目录下的ttyS1还是在的。但感觉就是ttyS1被pppd占用了，导致这样一个错误。
不知道有没有遇到这种现象的朋友，也求大神指导，这个问题困扰好多天了。 |
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发表于 2013-10-29 11:17
