【已解决】qt 调用外部应用报错 QWSLock::down(): Invalid argument QWSLock::up(): Invalid argumen

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qt4.8 再arm上运行

外部调用b程序
QProcess *pro = new QProcess;
pro->start("b");

会一直报错打印：

QWSLock::down(): Invalid argument

QWSLock::up(): Invalid argumen

通过网上查阅资料了解到是qt4.8的一个bug，修改qt源码文件重新编译就行了。

参考：http://lists.openmoko.org/pipermail/community/2012-November/067806.html

直接使用我做的脚本文件也行，自行修改源码也行；

1.脚本文件

脚本文件下载地址：稍后再上传！

下载patch_qt4.8.6.tar.gz 解压到qt-everywhere-opensource-src-4.8.6/中便可；（其他qt4.8的版本的没试过，我觉得应该都一样）；

2.源码修改

‘-’代表注释掉 ‘+’代表修改或添加diff --git a/src/gui/embedded/qwslock.cpp b/src/gui/embedded/qwslock.cppindex 9914a24..1055785 100644--- a/src/gui/embedded/qwslock.cpp+++ b/src/gui/embedded/qwslock.cpp@@ -83,9 +83,13 @@ QWSLock::QWSLock(int id) : semId(id)     QWSSignalHandler::instance()->addWSLock(this); #endif +    owned = false;+ #ifndef QT_POSIX_IPC     if (semId == -1) {         semId = semget(IPC_PRIVATE, 3, IPC_CREAT | 0666);+        owned = true;+//qDebug("QWSLock::QWSLock(): %p, %d", this, (int)semId);         if (semId == -1) {             perror("QWSLock::QWSLock");             qFatal("Unable to create semaphore");@@ -100,7 +104,6 @@ QWSLock::QWSLock(int id) : semId(id)     } #else     sems[0] = sems[1] = sems[2] = SEM_FAILED;-    owned = false;      if (semId == -1) {         // ### generate really unique IDs@@ -134,9 +137,12 @@ QWSLock::~QWSLock()      if (semId != -1) { #ifndef QT_POSIX_IPC-        qt_semun semval;-        semval.val = 0;-        semctl(semId, 0, IPC_RMID, semval);+if (owned) {+    qt_semun semval;+    semval.val = 0;+    semctl(semId, 0, IPC_RMID, semval);+}+//qDebug("QWSLock::~QWSLock(): %p, %d", this, (int)semId);         semId = -1; #else         // emulate the SEM_UNDO behavior for the BackingStore lock@@ -170,8 +176,10 @@ bool QWSLock::up(unsigned short semNum)     if (semNum == BackingStore)         sops.sem_flg |= SEM_UNDO; +    //qDebug("QWSLock::up(): %p, semop(%d, %d)", this, (int)semId, (int)semNum);     EINTR_LOOP(ret, semop(semId, &sops, 1)); #else+    //qDebug("QWSLock::up(): %p, sem_post(%d)", this, (int)(sems[semNum]));     ret = sem_post(sems[semNum]); #endif     if (ret == -1) {@@ -195,6 +203,7 @@ bool QWSLock::down(unsigned short semNum, int)     if (semNum == BackingStore)         sops.sem_flg |= SEM_UNDO; +    //qDebug("QWSLock::down(): %p, semop(%d, %d)", this, (int)semId, (int)semNum);     EINTR_LOOP(ret, semop(semId, &sops, 1)); #else     EINTR_LOOP(ret, sem_wait(sems[semNum]));diff --git a/src/gui/embedded/qwslock_p.h b/src/gui/embedded/qwslock_p.hindex d324e4f..d867d20 100644--- a/src/gui/embedded/qwslock_p.h+++ b/src/gui/embedded/qwslock_p.h@@ -86,8 +86,8 @@ private:     int lockCount[2]; #ifdef QT_POSIX_IPC     sem_t *sems[3];-    bool owned; #endif+    bool owned; };  QT_END_NAMESPACEdiff --git a/src/gui/kernel/qapplication_qws.cpp b/src/gui/kernel/qapplication_qws.cppindex 5314777..38ff052 100644--- a/src/gui/kernel/qapplication_qws.cpp+++ b/src/gui/kernel/qapplication_qws.cpp@@ -531,6 +531,7 @@ QWSDisplay::Data::~Data()         csocket->flush(); // may be pending QCop message, eg.         delete csocket;     }+    //qDebug("QWSDisplay::Data::~Data()");     delete clientLock;     clientLock = 0; #endif@@ -722,6 +723,7 @@ void QWSDisplay::Data::reinit( const QString& newAppName )     mouseFilter = 0;      qt_desktopWidget = 0;+    //qDebug("QWSDisplay::Data::reinit()");     delete QWSDisplay::Data::clientLock;     QWSDisplay::Data::clientLock = 0;

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