| /**************************************************************************** |
| ** |
| ** Copyright (C) 2015 The Qt Company Ltd. |
| ** Contact: http://www.qt.io/licensing/ |
| ** |
| ** This file is part of the QtCore module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:LGPL21$ |
| ** Commercial License Usage |
| ** Licensees holding valid commercial Qt licenses may use this file in |
| ** accordance with the commercial license agreement provided with the |
| ** Software or, alternatively, in accordance with the terms contained in |
| ** a written agreement between you and The Qt Company. For licensing terms |
| ** and conditions see http://www.qt.io/terms-conditions. For further |
| ** information use the contact form at http://www.qt.io/contact-us. |
| ** |
| ** GNU Lesser General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU Lesser |
| ** General Public License version 2.1 or version 3 as published by the Free |
| ** Software Foundation and appearing in the file LICENSE.LGPLv21 and |
| ** LICENSE.LGPLv3 included in the packaging of this file. Please review the |
| ** following information to ensure the GNU Lesser General Public License |
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| ** |
| ** As a special exception, The Qt Company gives you certain additional |
| ** rights. These rights are described in The Qt Company LGPL Exception |
| ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
| ** |
| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #ifndef QCORE_UNIX_P_H |
| #define QCORE_UNIX_P_H |
| |
| // |
| // W A R N I N G |
| // ------------- |
| // |
| // This file is not part of the Qt API. It exists for the convenience |
| // of Qt code on Unix. This header file may change from version to |
| // version without notice, or even be removed. |
| // |
| // We mean it. |
| // |
| |
| #include "qplatformdefs.h" |
| #include "qatomic.h" |
| |
| #ifndef Q_OS_UNIX |
| # error "qcore_unix_p.h included on a non-Unix system" |
| #endif |
| |
| #include <string.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <unistd.h> |
| |
| #include <sys/wait.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| |
| #if defined(Q_OS_VXWORKS) |
| # include <ioLib.h> |
| #endif |
| |
| struct sockaddr; |
| |
| #if defined(Q_OS_LINUX) && defined(O_CLOEXEC) |
| # define QT_UNIX_SUPPORTS_THREADSAFE_CLOEXEC 1 |
| QT_BEGIN_NAMESPACE |
| namespace QtLibcSupplement { |
| inline int accept4(int, sockaddr *, QT_SOCKLEN_T *, int) |
| { errno = ENOSYS; return -1; } |
| inline int dup3(int, int, int) |
| { errno = ENOSYS; return -1; } |
| inline int pipe2(int [], int ) |
| { errno = ENOSYS; return -1; } |
| } |
| QT_END_NAMESPACE |
| using namespace QT_PREPEND_NAMESPACE(QtLibcSupplement); |
| |
| #else |
| # define QT_UNIX_SUPPORTS_THREADSAFE_CLOEXEC 0 |
| #endif |
| |
| #define EINTR_LOOP(var, cmd) \ |
| do { \ |
| var = cmd; \ |
| } while (var == -1 && errno == EINTR) |
| |
| QT_BEGIN_NAMESPACE |
| |
| // Internal operator functions for timespecs |
| inline timespec &normalizedTimespec(timespec &t) |
| { |
| while (t.tv_nsec >= 1000000000) { |
| ++t.tv_sec; |
| t.tv_nsec -= 1000000000; |
| } |
| while (t.tv_nsec < 0) { |
| --t.tv_sec; |
| t.tv_nsec += 1000000000; |
| } |
| return t; |
| } |
| inline bool operator<(const timespec &t1, const timespec &t2) |
| { return t1.tv_sec < t2.tv_sec || (t1.tv_sec == t2.tv_sec && t1.tv_nsec < t2.tv_nsec); } |
| inline bool operator==(const timespec &t1, const timespec &t2) |
| { return t1.tv_sec == t2.tv_sec && t1.tv_nsec == t2.tv_nsec; } |
| inline bool operator!=(const timespec &t1, const timespec &t2) |
| { return !(t1 == t2); } |
| inline timespec &operator+=(timespec &t1, const timespec &t2) |
| { |
| t1.tv_sec += t2.tv_sec; |
| t1.tv_nsec += t2.tv_nsec; |
| return normalizedTimespec(t1); |
| } |
| inline timespec operator+(const timespec &t1, const timespec &t2) |
| { |
| timespec tmp; |
| tmp.tv_sec = t1.tv_sec + t2.tv_sec; |
| tmp.tv_nsec = t1.tv_nsec + t2.tv_nsec; |
| return normalizedTimespec(tmp); |
| } |
| inline timespec operator-(const timespec &t1, const timespec &t2) |
| { |
| timespec tmp; |
| tmp.tv_sec = t1.tv_sec - (t2.tv_sec - 1); |
| tmp.tv_nsec = t1.tv_nsec - (t2.tv_nsec + 1000000000); |
| return normalizedTimespec(tmp); |
| } |
| inline timespec operator*(const timespec &t1, int mul) |
| { |
| timespec tmp; |
| tmp.tv_sec = t1.tv_sec * mul; |
| tmp.tv_nsec = t1.tv_nsec * mul; |
| return normalizedTimespec(tmp); |
| } |
| |
| inline void qt_ignore_sigpipe() |
| { |
| // Set to ignore SIGPIPE once only. |
| static QBasicAtomicInt atom = Q_BASIC_ATOMIC_INITIALIZER(0); |
| if (!atom.load()) { |
| // More than one thread could turn off SIGPIPE at the same time |
| // But that's acceptable because they all would be doing the same |
| // action |
| struct sigaction noaction; |
| memset(&noaction, 0, sizeof(noaction)); |
| noaction.sa_handler = SIG_IGN; |
| ::sigaction(SIGPIPE, &noaction, 0); |
| atom.store(1); |
| } |
| } |
| |
| // don't call QT_OPEN or ::open |
| // call qt_safe_open |
| static inline int qt_safe_open(const char *pathname, int flags, mode_t mode = 0777) |
| { |
| #ifdef O_CLOEXEC |
| flags |= O_CLOEXEC; |
| #endif |
| int fd; |
| EINTR_LOOP(fd, QT_OPEN(pathname, flags, mode)); |
| |
| // unknown flags are ignored, so we have no way of verifying if |
| // O_CLOEXEC was accepted |
| if (fd != -1) |
| ::fcntl(fd, F_SETFD, FD_CLOEXEC); |
| return fd; |
| } |
| #undef QT_OPEN |
| #define QT_OPEN qt_safe_open |
| |
| #ifndef Q_OS_VXWORKS // no POSIX pipes in VxWorks |
| // don't call ::pipe |
| // call qt_safe_pipe |
| static inline int qt_safe_pipe(int pipefd[2], int flags = 0) |
| { |
| #ifdef O_CLOEXEC |
| Q_ASSERT((flags & ~(O_CLOEXEC | O_NONBLOCK)) == 0); |
| #else |
| Q_ASSERT((flags & ~O_NONBLOCK) == 0); |
| #endif |
| |
| int ret; |
| #if QT_UNIX_SUPPORTS_THREADSAFE_CLOEXEC && defined(O_CLOEXEC) |
| // use pipe2 |
| flags |= O_CLOEXEC; |
| ret = ::pipe2(pipefd, flags); // pipe2 is Linux-specific and is documented not to return EINTR |
| if (ret == 0 || errno != ENOSYS) |
| return ret; |
| #endif |
| |
| ret = ::pipe(pipefd); |
| if (ret == -1) |
| return -1; |
| |
| ::fcntl(pipefd[0], F_SETFD, FD_CLOEXEC); |
| ::fcntl(pipefd[1], F_SETFD, FD_CLOEXEC); |
| |
| // set non-block too? |
| if (flags & O_NONBLOCK) { |
| ::fcntl(pipefd[0], F_SETFL, ::fcntl(pipefd[0], F_GETFL) | O_NONBLOCK); |
| ::fcntl(pipefd[1], F_SETFL, ::fcntl(pipefd[1], F_GETFL) | O_NONBLOCK); |
| } |
| |
| return 0; |
| } |
| |
| #endif // Q_OS_VXWORKS |
| |
| // don't call dup or fcntl(F_DUPFD) |
| static inline int qt_safe_dup(int oldfd, int atleast = 0, int flags = FD_CLOEXEC) |
| { |
| Q_ASSERT(flags == FD_CLOEXEC || flags == 0); |
| |
| int ret; |
| #ifdef F_DUPFD_CLOEXEC |
| // use this fcntl |
| if (flags & FD_CLOEXEC) { |
| ret = ::fcntl(oldfd, F_DUPFD_CLOEXEC, atleast); |
| if (ret != -1 || errno != EINVAL) |
| return ret; |
| } |
| #endif |
| |
| // use F_DUPFD |
| ret = ::fcntl(oldfd, F_DUPFD, atleast); |
| |
| if (flags && ret != -1) |
| ::fcntl(ret, F_SETFD, flags); |
| return ret; |
| } |
| |
| // don't call dup2 |
| // call qt_safe_dup2 |
| static inline int qt_safe_dup2(int oldfd, int newfd, int flags = FD_CLOEXEC) |
| { |
| Q_ASSERT(flags == FD_CLOEXEC || flags == 0); |
| |
| int ret; |
| #if QT_UNIX_SUPPORTS_THREADSAFE_CLOEXEC && defined(O_CLOEXEC) |
| // use dup3 |
| if (flags & FD_CLOEXEC) { |
| EINTR_LOOP(ret, ::dup3(oldfd, newfd, O_CLOEXEC)); |
| if (ret == 0 || errno != ENOSYS) |
| return ret; |
| } |
| #endif |
| EINTR_LOOP(ret, ::dup2(oldfd, newfd)); |
| if (ret == -1) |
| return -1; |
| |
| if (flags) |
| ::fcntl(newfd, F_SETFD, flags); |
| return 0; |
| } |
| |
| static inline qint64 qt_safe_read(int fd, void *data, qint64 maxlen) |
| { |
| qint64 ret = 0; |
| EINTR_LOOP(ret, QT_READ(fd, data, maxlen)); |
| return ret; |
| } |
| #undef QT_READ |
| #define QT_READ qt_safe_read |
| |
| static inline qint64 qt_safe_write(int fd, const void *data, qint64 len) |
| { |
| qint64 ret = 0; |
| EINTR_LOOP(ret, QT_WRITE(fd, data, len)); |
| return ret; |
| } |
| #undef QT_WRITE |
| #define QT_WRITE qt_safe_write |
| |
| static inline qint64 qt_safe_write_nosignal(int fd, const void *data, qint64 len) |
| { |
| qt_ignore_sigpipe(); |
| return qt_safe_write(fd, data, len); |
| } |
| |
| static inline int qt_safe_close(int fd) |
| { |
| int ret; |
| EINTR_LOOP(ret, QT_CLOSE(fd)); |
| return ret; |
| } |
| #undef QT_CLOSE |
| #define QT_CLOSE qt_safe_close |
| |
| // - VxWorks doesn't have processes |
| #if !defined(Q_OS_VXWORKS) |
| static inline int qt_safe_execve(const char *filename, char *const argv[], |
| char *const envp[]) |
| { |
| int ret; |
| EINTR_LOOP(ret, ::execve(filename, argv, envp)); |
| return ret; |
| } |
| |
| static inline int qt_safe_execv(const char *path, char *const argv[]) |
| { |
| int ret; |
| EINTR_LOOP(ret, ::execv(path, argv)); |
| return ret; |
| } |
| |
| static inline int qt_safe_execvp(const char *file, char *const argv[]) |
| { |
| int ret; |
| EINTR_LOOP(ret, ::execvp(file, argv)); |
| return ret; |
| } |
| |
| static inline pid_t qt_safe_waitpid(pid_t pid, int *status, int options) |
| { |
| int ret; |
| EINTR_LOOP(ret, ::waitpid(pid, status, options)); |
| return ret; |
| } |
| #endif // Q_OS_VXWORKS |
| |
| #if !defined(_POSIX_MONOTONIC_CLOCK) |
| # define _POSIX_MONOTONIC_CLOCK -1 |
| #endif |
| |
| // in qelapsedtimer_mac.cpp or qtimestamp_unix.cpp |
| timespec qt_gettime() Q_DECL_NOTHROW; |
| void qt_nanosleep(timespec amount); |
| |
| Q_CORE_EXPORT int qt_safe_select(int nfds, fd_set *fdread, fd_set *fdwrite, fd_set *fdexcept, |
| const struct timespec *tv); |
| |
| int qt_select_msecs(int nfds, fd_set *fdread, fd_set *fdwrite, int timeout); |
| |
| #ifdef Q_OS_BLACKBERRY |
| class QSocketNotifier; |
| Q_CORE_EXPORT int bb_select(QList<QSocketNotifier *> socketNotifiers, int nfds, fd_set *fdread, |
| fd_set *fdwrite, int timeout); |
| #endif // Q_OS_BLACKBERRY |
| |
| // according to X/OPEN we have to define semun ourselves |
| // we use prefix as on some systems sem.h will have it |
| struct semid_ds; |
| union qt_semun { |
| int val; /* value for SETVAL */ |
| struct semid_ds *buf; /* buffer for IPC_STAT, IPC_SET */ |
| unsigned short *array; /* array for GETALL, SETALL */ |
| }; |
| |
| QT_END_NAMESPACE |
| |
| #endif |