mirror of https://github.com/python/cpython
Clean up pass for the previous patches.
- Use HAVE_GETHOSTBYNAME_R_6_ARG instead of testing for Linux and glibc2. - If gethostbyname takes 3 args, undefine HAVE_GETHOSTBYNAME_R -- don't know what code should be used. - New symbol USE_GETHOSTBYNAME_LOCK defined iff the lock should be used. - Modify the gethostbyaddr() code to also hold on to the lock until after it is safe to release, overlapping with the Python lock. (Note: I think that it could in theory be possible that Python code executed while gethostbyname_lock is held could attempt to reacquire the lock -- e.g. in a signal handler or destructor. I will simply say "don't do that then.")
This commit is contained in:
Guido van Rossum
parent
955becc3d9
commit
3baaa1375b
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@ -86,7 +86,17 @@ Socket methods:
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*/
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#include "Python.h"
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#if defined(WITH_THREAD) && !defined(HAVE_GETHOSTBYNAME_R) && !defined(MS_WINDOWS)
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#if defined(HAVE_GETHOSTBYNAME_R) && defined(HAVE_GETHOSTBYNAME_R_3_ARG)
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/* XXX Somebody please submit code for the 3-arg version! */
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#undef HAVE_GETHOSTBYNAME_R
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#endif
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#if !defined(HAVE_GETHOSTBYNAME_R) && defined(WITH_THREAD) && !defined(MS_WINDOWS)
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#define USE_GETHOSTBYNAME_LOCK
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#endif
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#ifdef USE_GETHOSTBYNAME_LOCK
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#include "pythread.h"
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#endif
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@ -312,7 +322,7 @@ BUILD_FUNC_DEF_4(PySocketSock_New,int,fd, int,family, int,type, int,proto)
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/* Lock to allow python interpreter to continue, but only allow one
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thread to be in gethostbyname */
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#if defined(WITH_THREAD) && !defined(HAVE_GETHOSTBYNAME_R) && !defined(MS_WINDOWS)
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#ifdef USE_GETHOSTBYNAME_LOCK
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PyThread_type_lock gethostbyname_lock;
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#endif
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@ -335,7 +345,7 @@ BUILD_FUNC_DEF_2(setipaddr, char*,name, struct sockaddr_in *,addr_ret)
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char buf[1001];
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int buf_len = (sizeof buf) - 1;
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int errnop;
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#if defined(linux) && (__GLIBC__ >= 2)
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#ifdef HAVE_GETHOSTBYNAME_R_6_ARG
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int result;
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#endif
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#endif /* HAVE_GETHOSTBYNAME_R */
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@ -359,14 +369,14 @@ BUILD_FUNC_DEF_2(setipaddr, char*,name, struct sockaddr_in *,addr_ret)
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}
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Py_BEGIN_ALLOW_THREADS
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#ifdef HAVE_GETHOSTBYNAME_R
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#if defined(linux) && (__GLIBC__ >= 2)
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#ifdef HAVE_GETHOSTBYNAME_R_6_ARG
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result = gethostbyname_r(name, &hp_allocated, buf, buf_len, &hp, &errnop);
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#else
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hp = gethostbyname_r(name, &hp_allocated, buf, buf_len, &errnop);
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#endif
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#else /* not HAVE_GETHOSTBYNAME_R */
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#if defined(WITH_THREAD) && !defined(MS_WINDOWS)
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PyThread_acquire_lock(gethostbyname_lock,1);
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#ifdef USE_GETHOSTBYNAME_LOCK
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PyThread_acquire_lock(gethostbyname_lock, 1);
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#endif
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hp = gethostbyname(name);
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#endif /* HAVE_GETHOSTBYNAME_R */
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@ -380,14 +390,14 @@ BUILD_FUNC_DEF_2(setipaddr, char*,name, struct sockaddr_in *,addr_ret)
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#else
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PyErr_SetString(PySocket_Error, "host not found");
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#endif
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#if defined(WITH_THREAD) && !defined(HAVE_GETHOSTBYNAME_R) && !defined(MS_WINDOWS)
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#ifdef USE_GETHOSTBYNAME_LOCK
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PyThread_release_lock(gethostbyname_lock);
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#endif
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return -1;
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}
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memcpy((char *) &addr_ret->sin_addr, hp->h_addr, hp->h_length);
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h_length = hp->h_length;
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#if defined(WITH_THREAD) && !defined(HAVE_GETHOSTBYNAME_R) && !defined(MS_WINDOWS)
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#ifdef USE_GETHOSTBYNAME_LOCK
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PyThread_release_lock(gethostbyname_lock);
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#endif
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return h_length;
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@ -1420,7 +1430,7 @@ BUILD_FUNC_DEF_2(PySocket_gethostbyname_ex,PyObject *,self, PyObject *,args)
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char buf[16384];
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int buf_len = (sizeof buf) - 1;
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int errnop;
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#if defined(linux) && (__GLIBC__ >= 2)
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#ifdef HAVE_GETHOSTBYNAME_R_6_ARG
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int result;
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#endif
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#endif /* HAVE_GETHOSTBYNAME_R */
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@ -1430,20 +1440,20 @@ BUILD_FUNC_DEF_2(PySocket_gethostbyname_ex,PyObject *,self, PyObject *,args)
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return NULL;
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Py_BEGIN_ALLOW_THREADS
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#ifdef HAVE_GETHOSTBYNAME_R
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#if defined(linux) && (__GLIBC__ >= 2)
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#ifdef HAVE_GETHOSTBYNAME_R_6_ARG
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result = gethostbyname_r(name, &hp_allocated, buf, buf_len, &h, &errnop);
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#else
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h = gethostbyname_r(name, &hp_allocated, buf, buf_len, &errnop);
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#endif
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#else /* not HAVE_GETHOSTBYNAME_R */
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#if defined(WITH_THREAD) && !defined(MS_WINDOWS)
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PyThread_acquire_lock(gethostbyname_lock,1);
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#ifdef USE_GETHOSTBYNAME_LOCK
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PyThread_acquire_lock(gethostbyname_lock, 1);
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#endif
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h = gethostbyname(name);
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#endif /* HAVE_GETHOSTBYNAME_R */
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Py_END_ALLOW_THREADS
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ret = gethost_common(h,&addr);
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#if defined(WITH_THREAD) && !defined(HAVE_GETHOSTBYNAME_R) && !defined(MS_WINDOWS)
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ret = gethost_common(h, &addr);
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#ifdef USE_GETHOSTBYNAME_LOCK
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PyThread_release_lock(gethostbyname_lock);
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#endif
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return ret;
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@ -1465,12 +1475,13 @@ BUILD_FUNC_DEF_2(PySocket_gethostbyaddr,PyObject *,self, PyObject *, args)
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struct sockaddr_in addr;
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char *ip_num;
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struct hostent *h;
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PyObject *ret;
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#ifdef HAVE_GETHOSTBYNAME_R
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struct hostent hp_allocated;
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char buf[16384];
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int buf_len = (sizeof buf) - 1;
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int errnop;
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#if defined(linux) && (__GLIBC__ >= 2)
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#ifdef HAVE_GETHOSTBYNAME_R_6_ARG
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int result;
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#endif
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#endif /* HAVE_GETHOSTBYNAME_R */
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@ -1481,7 +1492,7 @@ BUILD_FUNC_DEF_2(PySocket_gethostbyaddr,PyObject *,self, PyObject *, args)
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return NULL;
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Py_BEGIN_ALLOW_THREADS
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#ifdef HAVE_GETHOSTBYNAME_R
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#if defined(linux) && (__GLIBC__ >= 2)
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#ifdef HAVE_GETHOSTBYNAME_R_6_ARG
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result = gethostbyaddr_r((char *)&addr.sin_addr,
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sizeof(addr.sin_addr),
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AF_INET, &hp_allocated, buf, buf_len,
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@ -1493,18 +1504,19 @@ BUILD_FUNC_DEF_2(PySocket_gethostbyaddr,PyObject *,self, PyObject *, args)
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&hp_allocated, buf, buf_len, &errnop);
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#endif
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#else /* not HAVE_GETHOSTBYNAME_R */
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#if defined(WITH_THREAD) && !defined(MS_WINDOWS)
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PyThread_acquire_lock(gethostbyname_lock,1);
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#ifdef USE_GETHOSTBYNAME_LOCK
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PyThread_acquire_lock(gethostbyname_lock, 1);
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#endif
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h = gethostbyaddr((char *)&addr.sin_addr,
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sizeof(addr.sin_addr),
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AF_INET);
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#if defined(WITH_THREAD) && !defined(MS_WINDOWS)
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PyThread_release_lock(gethostbyname_lock);
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#endif
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#endif /* HAVE_GETHOSTBYNAME_R */
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Py_END_ALLOW_THREADS
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return gethost_common(h,&addr);
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ret = gethost_common(h, &addr);
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#ifdef USE_GETHOSTBYNAME_LOCK
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PyThread_release_lock(gethostbyname_lock);
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#endif
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return ret;
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}
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static char gethostbyaddr_doc[] =
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@ -2218,7 +2230,7 @@ initsocket()
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#endif
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/* Initialize gethostbyname lock */
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#if defined(WITH_THREAD) && !defined(HAVE_GETHOSTBYNAME_R) && !defined(MS_WINDOWS)
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#ifdef USE_GETHOSTBYNAME_LOCK
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gethostbyname_lock = PyThread_allocate_lock();
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#endif
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}
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