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#include "processutils.h"

#if defined(Q_OS_WIN)
#   define PSAPI_VERSION 1      // To use GetModuleFileNameEx from Psapi.lib on all Win versions.
#   include <qt_windows.h>
#   include <Psapi.h>
#elif defined(Q_OS_DARWIN)
#   include <libproc.h>
#elif defined(Q_OS_LINUX)
#   include "fileinfo.h"
#   include <unistd.h>
#   include <cstdio>
#elif defined(Q_OS_BSD4)
#   include <sys/user.h>
#else
#   error Missing implementation of processNameByPid for this platform.
#endif

namespace qbs {
namespace Internal {

QString processNameByPid(qint64 pid)
{
#if defined(Q_OS_WIN)
    HANDLE hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, DWORD(pid));
    if (!hProcess)
        return QString();
    wchar_t buf[MAX_PATH];
    const DWORD length = GetModuleFileNameEx(hProcess, NULL, buf, sizeof(buf) / sizeof(wchar_t));
    CloseHandle(hProcess);
    if (!length)
        return QString();
    QString name = QString::fromWCharArray(buf, length);
    int i = name.lastIndexOf(QLatin1Char('\\'));
    if (i >= 0)
        name.remove(0, i + 1);
    i = name.lastIndexOf(QLatin1Char('.'));
    if (i >= 0)
        name.truncate(i);
    return name;
#elif defined(Q_OS_DARWIN)
    char name[1024];
    proc_name(pid, name, sizeof(name) / sizeof(char));
    return QString::fromUtf8(name);
#elif defined(Q_OS_LINUX)
    char exePath[64];
    char buf[PATH_MAX];
    memset(buf, 0, sizeof(buf));
    sprintf(exePath, "/proc/%lld/exe", pid);
    readlink(exePath, buf, sizeof(buf));
    return FileInfo::fileName(QString::fromUtf8(buf));
#elif defined(Q_OS_BSD4)
    kinfo_proc *proc = kinfo_getproc(pid);
    if (!proc)
        return QString();
    QString name = QString::fromUtf8(proc->ki_comm);
    free(proc);
    return name;
#else
    return QString();
#endif
}

} // namespace Internal
} // namespace qbs
