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posix/fd: add more comments

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This commit is contained in:
Danny Robson 2016-10-02 16:34:40 +11:00
parent 4608c65c84
commit b949b90dd7
2 changed files with 14 additions and 6 deletions
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9
posix/fd.cpp
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@ -43,7 +43,7 @@ fd::fd (const char *path, int flags, mode_t mode):
}
//-----------------------------------------------------------------------------
///////////////////////////////////////////////////////////////////////////////
fd::fd (fd &&rhs):
m_fd (-1)
{
@ -51,13 +51,10 @@ fd::fd (fd &&rhs):
}
//-----------------------------------------------------------------------------
///////////////////////////////////////////////////////////////////////////////
fd::fd (int _fd):
m_fd (_fd)
{
if (_fd < 0)
throw std::invalid_argument ("invalid descriptor");
}
{ ; }
///////////////////////////////////////////////////////////////////////////////

11
posix/fd.hpp
View File

@ -25,20 +25,31 @@ namespace util::posix {
/// A simple RAII wrapper for file descriptors
class fd {
public:
///////////////////////////////////////////////////////////////////////
fd (const char *path, int flags);
fd (const char *path, int flags, mode_t);
fd (fd &&);
// The int constructor steals the fd. So don't pass in something that
// you don't want closed at destruct time. This should really only be
// used when interfacing with results of syscalls that we don't wrap.
explicit fd (int);
// copy constructors are removed in favour of explicit calls to dup.
// This should reduce unexpected or expensive copies as much as
// possible; one should not be doing this unless it is absolutely
// required.
fd (const fd&) = delete;
fd dup (void) const;
static fd dup (int);
~fd ();
///////////////////////////////////////////////////////////////////////
struct ::stat stat (void) const;
///////////////////////////////////////////////////////////////////////
operator int (void) const;
private: