/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright (C) 2019, Google Inc. * * signal-threads.cpp - Cross-thread signal delivery test */ #include #include #include #include "libcamera/internal/message.h" #include "libcamera/internal/thread.h" #include "libcamera/internal/utils.h" #include "test.h" using namespace std; using namespace libcamera; class SignalReceiver : public Object { public: enum Status { NoSignal, InvalidThread, SignalReceived, }; SignalReceiver() : status_(NoSignal) { } Status status() const { return status_; } int value() const { return value_; } void reset() { status_ = NoSignal; value_ = 0; } void slot(int value) { if (Thread::current() != thread()) status_ = InvalidThread; else status_ = SignalReceived; value_ = value; } private: Status status_; int value_; }; class SignalThreadsTest : public Test { protected: int run() { SignalReceiver receiver; signal_.connect(&receiver, &SignalReceiver::slot); /* Test that a signal is received in the main thread. */ signal_.emit(0); switch (receiver.status()) { case SignalReceiver::NoSignal: cout << "No signal received for direct connection" << endl; return TestFail; case SignalReceiver::InvalidThread: cout << "Signal received in incorrect thread " "for direct connection" << endl; return TestFail; default: break; } /* * Move the object to a thread and verify that the signal is * correctly delivered, with the correct data. */ receiver.reset(); receiver.moveToThread(&thread_); thread_.start(); signal_.emit(42); this_thread::sleep_for(chrono::milliseconds(100)); switch (receiver.status()) { case SignalReceiver::NoSignal: cout << "No signal received for message connection" << endl; return TestFail; case SignalReceiver::InvalidThread: cout << "Signal received in incorrect thread " "for message connection" << endl; return TestFail; default: break; } if (receiver.value() != 42) { cout << "Signal received with incorrect value" << endl; return TestFail; } return TestPass; } void cleanup() { thread_.exit(0); thread_.wait(); } private: Thread thread_; Signal signal_; }; TEST_REGISTER(SignalThreadsTest) '/>
path: root/src/libcamera/utils.cpp
blob: 7e118fafdd6e4e46e51f66583783c712bbe51d42 (plain) 
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * utils.cpp - Miscellaneous utility functions
 */

#include "utils.h"

#include <dlfcn.h>
#include <elf.h>
#include <iomanip>
#include <link.h>
#include <sstream>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

/**
 * \file utils.h
 * \brief Miscellaneous utility functions
 */

/* musl doesn't declare _DYNAMIC in link.h, declare it manually. */
extern ElfW(Dyn) _DYNAMIC[];

namespace libcamera {

namespace utils {

/**
 * \def ARRAY_SIZE(array)
 * \brief Determine the number of elements in the static array.
 */

/**
 * \brief Strip the directory prefix from the path
 * \param[in] path The path to process
 *
 * basename is implemented differently across different C libraries. This
 * implementation matches the one provided by the GNU libc, and does not
 * modify its input parameter.
 *
 * \return A pointer within the given path without any leading directory
 * components.
 */
const char *basename(const char *path)
{
       const char *base = strrchr(path, '/');
       return base ? base + 1 : path;
}

/**
 * \brief Get an environment variable
 * \param[in] name The name of the variable to return
 *
 * The environment list is searched to find the variable 'name', and the
 * corresponding string is returned.
 *
 * If 'secure execution' is required then this function always returns NULL to
 * avoid vulnerabilities that could occur if set-user-ID or set-group-ID
 * programs accidentally trust the environment.
 *
 * \return A pointer to the value in the environment or NULL if the requested
 * environment variable doesn't exist or if secure execution is required.
 */
char *secure_getenv(const char *name)
{
#if HAVE_SECURE_GETENV
	return ::secure_getenv(name);
#else
	if (issetugid())
		return NULL;

	return getenv(name);
#endif
}

/**
 * \brief Identify the dirname portion of a path
 * \param[in] path The full path to parse
 *
 * This function conforms with the behaviour of the %dirname() function as
 * defined by POSIX.
 *
 * \return A string of the directory component of the path
 */
std::string dirname(const std::string &path)
{
	if (path.empty())
		return ".";

	/*
	 * Skip all trailing slashes. If the path is only made of slashes,
	 * return "/".
	 */
	size_t pos = path.size() - 1;
	while (path[pos] == '/') {
		if (!pos)
			return "/";
		pos--;
	}

	/*
	 * Find the previous slash. If the path contains no non-trailing slash,
	 * return ".".
	 */
	while (path[pos] != '/') {
		if (!pos)
			return ".";
		pos--;
	}

	/*
	 * Return the directory name up to (but not including) any trailing
	 * slash. If this would result in an empty string, return "/".
	 */
	while (path[pos] == '/') {
		if (!pos)
			return "/";
		pos--;
	}

	return path.substr(0, pos + 1);
}

/**
 * \fn libcamera::utils::set_overlap(InputIt1 first1, InputIt1 last1,
 *				     InputIt2 first2, InputIt2 last2)
 * \brief Count the number of elements in the intersection of two ranges
 *
 * Count the number of elements in the intersection of the sorted ranges [\a
 * first1, \a last1) and [\a first1, \a last2). Elements are compared using
 * operator< and the ranges must be sorted with respect to the same.
 *
 * \return The number of elements in the intersection of the two ranges
 */

/**
 * \fn libcamera::utils::clamp(const T& v, const T& lo, const T& hi)
 * \param[in] v The value to clamp
 * \param[in] lo The lower boundary to clamp v to
 * \param[in] hi The higher boundary to clamp v to
 * \return lo if v is less than lo, hi if v is greater than hi, otherwise v
 */

/**
 * \typedef clock
 * \brief The libcamera clock (monotonic)
 */

/**
 * \typedef duration