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Portable POSIX-like unnamed semaphores that work in process-shared memory.
This commit is contained in:
nelsonb%netscape.com
parent
c20f157140
commit
6166732e49
385
security/nss/lib/ssl/sslmutex.c
Normal file
385
security/nss/lib/ssl/sslmutex.c
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@ -0,0 +1,385 @@
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/*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is the Netscape security libraries.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 2001 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the
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* terms of the GNU General Public License Version 2 or later (the
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* "GPL"), in which case the provisions of the GPL are applicable
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* instead of those above. If you wish to allow use of your
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* version of this file only under the terms of the GPL and not to
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* allow others to use your version of this file under the MPL,
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* indicate your decision by deleting the provisions above and
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* replace them with the notice and other provisions required by
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* the GPL. If you do not delete the provisions above, a recipient
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* may use your version of this file under either the MPL or the
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* GPL.
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*
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* $Id: sslmutex.c,v 1.1 2001/06/08 02:56:29 nelsonb%netscape.com Exp $
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*/
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#include "sslmutex.h"
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#include "prerr.h"
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#if defined(LINUX) || defined(AIX)
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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#include <errno.h>
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#include "unix_err.h"
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#define SSL_MUTEX_MAGIC 0xfeedfd
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#define NONBLOCKING_POSTS 1 /* maybe this is faster */
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#if NONBLOCKING_POSTS
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#ifndef FNONBLOCK
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#define FNONBLOCK O_NONBLOCK
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#endif
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static int
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setNonBlocking(int fd, int nonBlocking)
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{
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int flags;
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int err;
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flags = fcntl(fd, F_GETFL, 0);
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if (0 > flags)
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return flags;
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if (nonBlocking)
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flags |= FNONBLOCK;
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else
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flags &= ~FNONBLOCK;
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err = fcntl(fd, F_SETFL, flags);
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return err;
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}
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#endif
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SECStatus
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sslMutex_Init(sslMutex *pMutex, int shared)
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{
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int err;
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int mPipes[3];
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char c = 1;
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memset(pMutex, -1, sizeof *pMutex);
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err = pipe(mPipes);
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if (err) {
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return err;
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}
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/* close-on-exec is false by default */
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if (!shared) {
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err = fcntl(mPipes[0], F_SETFD, FD_CLOEXEC);
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if (err)
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goto loser;
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err = fcntl(mPipes[1], F_SETFD, FD_CLOEXEC);
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if (err)
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goto loser;
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}
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#if NONBLOCKING_POSTS
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err = setNonBlocking(mPipes[1], 1);
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if (err)
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goto loser;
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#endif
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do {
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err = write(mPipes[1], &c, 1);
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} while (err < 0 && (errno == EINTR || errno == EAGAIN));
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if (0 > err)
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goto loser;
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mPipes[2] = SSL_MUTEX_MAGIC;
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memcpy(pMutex, mPipes, sizeof mPipes);
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return SECSuccess;
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loser:
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nss_MD_unix_map_default_error(errno);
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close(mPipes[0]);
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close(mPipes[1]);
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return SECFailure;
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}
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SECStatus
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sslMutex_Destroy(sslMutex *pMutex)
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{
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int * mPipes = (int *)pMutex;
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if (mPipes[2] != SSL_MUTEX_MAGIC) {
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PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
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return SECFailure;
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}
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close(mPipes[0]);
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close(mPipes[1]);
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memset(pMutex, -1, sizeof *pMutex);
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return SECSuccess;
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}
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SECStatus
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sslMutex_Unlock(sslMutex *pMutex)
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{
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int * mPipes = (int *)pMutex;
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int cc;
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char c = 1;
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if (mPipes[2] != SSL_MUTEX_MAGIC) {
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PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
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return SECFailure;
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}
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do {
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cc = write(mPipes[1], &c, 1);
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} while (cc < 0 && (errno == EINTR || errno == EAGAIN));
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if (cc == 1)
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return SECSuccess;
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if (cc < 0)
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nss_MD_unix_map_default_error(errno);
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else
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PORT_SetError(PR_UNKNOWN_ERROR);
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return SECFailure;
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}
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SECStatus
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sslMutex_Lock(sslMutex *pMutex)
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{
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int * mPipes = (int *)pMutex;
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int cc;
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char c;
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if (mPipes[2] != SSL_MUTEX_MAGIC) {
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PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
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return SECFailure;
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}
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do {
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cc = read(mPipes[0], &c, 1);
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} while (cc < 0 && errno == EINTR);
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if (cc == 1)
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return SECSuccess;
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if (cc < 0)
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nss_MD_unix_map_default_error(errno);
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else
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PORT_SetError(PR_UNKNOWN_ERROR);
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return SECFailure;
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}
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#elif defined(WIN32)
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#include "win32err.h"
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/* The presence of the TRUE element in this struct makes the semaphore
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* inheritable. The NULL means use process's default security descriptor.
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*/
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SECStatus
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sslMutex_Init(sslMutex *pMutex, int shared)
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{
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HANDLE hMutex;
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SECURITY_ATTRIBUTES attributes =
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{ sizeof(SECURITY_ATTRIBUTES), NULL, TRUE };
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PR_ASSERT(pMutex != 0 && (*pMutex == 0 || *pMutex == INVALID_HANDLE_VALUE));
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if (!pMutex || ((hMutex = *pMutex) != 0 && hMutex != INVALID_HANDLE_VALUE)) {
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PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
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return SECFailure;
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}
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attributes.bInheritHandle = (shared ? TRUE : FALSE);
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hMutex = CreateMutex(&attributes, FALSE, NULL);
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if (hMutex == NULL) {
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hMutex = INVALID_HANDLE_VALUE;
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nss_MD_win32_map_default_error(GetLastError());
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return SECFailure;
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}
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*pMutex = hMutex;
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return SECSuccess;
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}
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int
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sslMutex_Destroy(sslMutex *pMutex)
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{
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HANDLE hMutex;
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int rv;
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PR_ASSERT(pMutex != 0 && *pMutex != 0 && *pMutex != INVALID_HANDLE_VALUE);
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if (!pMutex || (hMutex = *pMutex) == 0 || hMutex == INVALID_HANDLE_VALUE) {
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PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
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return SECFailure;
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}
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rv = CloseHandle(hMutex); /* ignore error */
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if (rv) {
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*pMutex = hMutex = INVALID_HANDLE_VALUE;
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return SECSuccess;
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}
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nss_MD_win32_map_default_error(GetLastError());
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return SECFailure;
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}
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int
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sslMutex_Unlock(sslMutex *pMutex)
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{
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BOOL success = FALSE;
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HANDLE hMutex;
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PR_ASSERT(pMutex != 0 && *pMutex != 0 && *pMutex != INVALID_HANDLE_VALUE);
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if (!pMutex || (hMutex = *pMutex) == 0 || hMutex == INVALID_HANDLE_VALUE) {
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PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
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return SECFailure;
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}
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success = ReleaseMutex(hMutex);
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if (!success) {
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nss_MD_win32_map_default_error(GetLastError());
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return SECFailure;
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}
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return SECSuccess;
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}
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int
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sslMutex_Lock(sslMutex *pMutex)
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{
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HANDLE hMutex;
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DWORD event;
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DWORD lastError;
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SECStatus rv;
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PR_ASSERT(pMutex != 0 && *pMutex != 0 && *pMutex != INVALID_HANDLE_VALUE);
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if (!pMutex || (hMutex = *pMutex) == 0 || hMutex == INVALID_HANDLE_VALUE) {
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PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
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return SECFailure; /* what else ? */
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}
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event = WaitForSingleObject(hMutex, INFINITE);
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switch (event) {
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case WAIT_OBJECT_0:
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case WAIT_ABANDONED:
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rv = SECSuccess;
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break;
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case WAIT_TIMEOUT:
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case WAIT_IO_COMPLETION:
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default: /* should never happen. nothing we can do. */
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PR_ASSERT(!("WaitForSingleObject returned invalid value."));
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PORT_SetError(PR_UNKNOWN_ERROR);
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rv = SECFailure;
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break;
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case WAIT_FAILED: /* failure returns this */
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rv = SECFailure;
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lastError = GetLastError(); /* for debugging */
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nss_MD_win32_map_default_error(lastError);
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break;
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}
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return rv;
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}
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#elif defined(XP_UNIX)
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#include <errno.h>
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#include "unix_err.h"
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SECStatus
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sslMutex_Init(sslMutex *pMutex, int shared)
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{
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int rv;
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do {
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rv = sem_init(pMutex, shared, 1);
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} while (rv < 0 && errno == EINTR);
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if (rv < 0) {
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nss_MD_unix_map_default_error(errno);
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return SECFailure;
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}
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return SECSuccess;
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}
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SECStatus
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sslMutex_Destroy(sslMutex *pMutex)
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{
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int rv;
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do {
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rv = sem_destroy(pMutex);
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} while (rv < 0 && errno == EINTR);
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if (rv < 0) {
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nss_MD_unix_map_default_error(errno);
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return SECFailure;
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}
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return SECSuccess;
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}
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SECStatus
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sslMutex_Unlock(sslMutex *pMutex)
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{
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int rv;
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do {
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rv = sem_post(pMutex);
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} while (rv < 0 && errno == EINTR);
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if (rv < 0) {
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nss_MD_unix_map_default_error(errno);
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return SECFailure;
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}
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return SECSuccess;
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}
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SECStatus
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sslMutex_Lock(sslMutex *pMutex)
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{
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int rv;
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do {
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rv = sem_wait(pMutex);
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} while (rv < 0 && errno == EINTR);
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if (rv < 0) {
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nss_MD_unix_map_default_error(errno);
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return SECFailure;
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}
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return SECSuccess;
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}
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#else
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SECStatus
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sslMutex_Init(sslMutex *pMutex, int shared)
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{
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PORT_Assert(!("sslMutex_Init not implemented!"));
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PORT_SetError(PR_NOT_IMPLEMENTED_ERROR);
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return SECFailure;
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}
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SECStatus
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sslMutex_Destroy(sslMutex *pMutex)
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{
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PORT_Assert(!("sslMutex_Destroy not implemented!"));
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PORT_SetError(PR_NOT_IMPLEMENTED_ERROR);
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return SECFailure;
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}
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SECStatus
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sslMutex_Unlock(sslMutex *pMutex)
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{
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PORT_Assert(!("sslMutex_Unlock not implemented!"));
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PORT_SetError(PR_NOT_IMPLEMENTED_ERROR);
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return SECFailure;
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}
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SECStatus
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sslMutex_Lock(sslMutex *pMutex)
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{
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PORT_Assert(!("sslMutex_Lock not implemented!"));
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PORT_SetError(PR_NOT_IMPLEMENTED_ERROR);
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return SECFailure;
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}
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#endif
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101
security/nss/lib/ssl/sslmutex.h
Normal file
101
security/nss/lib/ssl/sslmutex.h
Normal file
@ -0,0 +1,101 @@
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/*
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* The contents of this file are subject to the Mozilla Public
|
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* License Version 1.1 (the "License"); you may not use this file
|
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* except in compliance with the License. You may obtain a copy of
|
||||
* the License at http://www.mozilla.org/MPL/
|
||||
*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
|
||||
* rights and limitations under the License.
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*
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* The Original Code is the Netscape security libraries.
|
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*
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* The Initial Developer of the Original Code is Netscape
|
||||
* Communications Corporation. Portions created by Netscape are
|
||||
* Copyright (C) 2001 Netscape Communications Corporation. All
|
||||
* Rights Reserved.
|
||||
*
|
||||
* Contributor(s):
|
||||
*
|
||||
* Alternatively, the contents of this file may be used under the
|
||||
* terms of the GNU General Public License Version 2 or later (the
|
||||
* "GPL"), in which case the provisions of the GPL are applicable
|
||||
* instead of those above. If you wish to allow use of your
|
||||
* version of this file only under the terms of the GPL and not to
|
||||
* allow others to use your version of this file under the MPL,
|
||||
* indicate your decision by deleting the provisions above and
|
||||
* replace them with the notice and other provisions required by
|
||||
* the GPL. If you do not delete the provisions above, a recipient
|
||||
* may use your version of this file under either the MPL or the
|
||||
* GPL.
|
||||
*
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* $Id: sslmutex.h,v 1.1 2001/06/08 02:56:31 nelsonb%netscape.com Exp $
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*/
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#ifndef __SSLMUTEX_H_
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#define __SSLMUTEX_H_ 1
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/* What SSL really wants is portable process-shared unnamed mutexes in
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* shared memory, that have the property that if the process that holds
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* them dies, they are released automatically, and that (unlike fcntl
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* record locking) lock to the thread, not to the process.
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* NSPR doesn't provide that.
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* Windows has mutexes that meet that description, but they're not portable.
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* POSIX mutexes are not automatically released when the holder dies,
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* and other processes/threads cannot release the mutex on behalf of the
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* dead holder.
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* POSIX semaphores can be used to accomplish this on systems that implement
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* process-shared unnamed POSIX semaphores, because a watchdog thread can
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* discover and release semaphores that were held by a dead process.
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* On systems that do not support process-shared POSIX unnamed semaphores,
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* they can be emulated using pipes.
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* The performance cost of doing that is not yet measured.
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*
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* So, this API looks a lot like POSIX pthread mutexes.
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*/
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#if defined(WIN32)
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#include <wtypes.h>
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typedef HANDLE sslMutex;
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typedef int sslPID;
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#elif defined(LINUX) || defined(AIX)
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#include <sys/types.h>
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typedef struct { int ps[3]; } sslMutex;
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typedef pid_t sslPID;
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#elif defined(XP_UNIX) /* other types of Unix */
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#include <sys/types.h> /* for pid_t */
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#include <semaphore.h> /* for sem_t, and sem_* functions */
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typedef sem_t sslMutex;
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typedef pid_t sslPID;
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#else
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/* what platform is this ?? */
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typedef int sslMutex;
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typedef int sslPID;
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#endif
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#include "seccomon.h"
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SEC_BEGIN_PROTOS
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extern SECStatus sslMutex_Init(sslMutex *sem, int shared);
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extern SECStatus sslMutex_Destroy(sslMutex *sem);
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extern SECStatus sslMutex_Unlock(sslMutex *sem);
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extern SECStatus sslMutex_Lock(sslMutex *sem);
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SEC_END_PROTOS
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#endif
|
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