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-rw-r--r--camel/camel-lock-client.c332
1 files changed, 0 insertions, 332 deletions
diff --git a/camel/camel-lock-client.c b/camel/camel-lock-client.c
deleted file mode 100644
index fbbed82192..0000000000
--- a/camel/camel-lock-client.c
+++ /dev/null
@@ -1,332 +0,0 @@
-/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
- *
- * Copyright (C) 2001 Ximian Inc.
- *
- * Authors: Michael Zucchi <notzed@ximian.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- * USA
- */
-
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
-#include <stdio.h>
-#include <stdlib.h>
-
-#include <errno.h>
-#include <string.h>
-
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/wait.h>
-
-#include <unistd.h>
-#include <fcntl.h>
-
-#ifdef ENABLE_THREADS
-#include <pthread.h>
-#endif
-
-#include "camel-exception.h"
-#include "camel-lock-helper.h"
-#include "camel-lock-client.h"
-
-#define d(x)
-
-/* dunno where this fucking thing is got from */
-/* see also camel-lock.c */
-#define _(x) (x)
-
-#ifdef ENABLE_THREADS
-static pthread_mutex_t lock_lock = PTHREAD_MUTEX_INITIALIZER;
-#define LOCK() pthread_mutex_lock(&lock_lock)
-#define UNLOCK() pthread_mutex_unlock(&lock_lock)
-#else
-#define LOCK()
-#define UNLOCK()
-#endif
-
-static int lock_sequence;
-static int lock_helper_pid = -1;
-static int lock_stdin_pipe[2], lock_stdout_pipe[2];
-
-static int read_n(int fd, void *buffer, int inlen)
-{
- char *p = buffer;
- int len, left = inlen;
-
- do {
- len = read(fd, p, left);
- if (len == -1) {
- if (errno != EINTR)
- return -1;
- } else {
- left -= len;
- p += len;
- }
- } while (left > 0 && len != 0);
-
- return inlen - left;
-}
-
-static int write_n(int fd, void *buffer, int inlen)
-{
- char *p = buffer;
- int len, left = inlen;
-
- do {
- len = write(fd, p, left);
- if (len == -1) {
- if (errno != EINTR)
- return -1;
- } else {
- left -= len;
- p += len;
- }
- } while (left > 0);
-
- return inlen;
-}
-
-static int camel_lock_helper_init(CamelException *ex)
-{
- int i;
-
- if (pipe(lock_stdin_pipe) == -1
- || pipe(lock_stdout_pipe) == -1) {
- camel_exception_setv(ex, CAMEL_EXCEPTION_SYSTEM,
- _("Cannot build locking helper pipe: %s"),
- strerror(errno));
- return -1;
- }
-
- lock_helper_pid = fork();
- switch(lock_helper_pid) {
- case -1:
- close(lock_stdin_pipe[0]);
- close(lock_stdin_pipe[1]);
- close(lock_stdout_pipe[0]);
- close(lock_stdout_pipe[1]);
- camel_exception_setv(ex, CAMEL_EXCEPTION_SYSTEM,
- _("Cannot fork locking helper: %s"),
- strerror(errno));
- return -1;
- case 0:
- close(STDIN_FILENO);
- dup(lock_stdin_pipe[0]);
- close(STDOUT_FILENO);
- dup(lock_stdout_pipe[1]);
- close(lock_stdin_pipe[0]);
- close(lock_stdin_pipe[1]);
- close(lock_stdout_pipe[0]);
- close(lock_stdout_pipe[1]);
- for (i=3;i<255;i++)
- close(i);
- execl(CAMEL_SBINDIR "/camel-lock-helper", "camel-lock-helper", NULL);
- d(fprintf(stderr, "shit, couldn't exec lock helper!\n"));
- /* it'll pick this up when it tries to use us */
- exit(255);
- default:
- close(lock_stdin_pipe[0]);
- close(lock_stdout_pipe[1]);
-
- /* so the child knows when we vanish */
- fcntl(lock_stdin_pipe[1], F_SETFD, FD_CLOEXEC);
- fcntl(lock_stdout_pipe[0], F_SETFD, FD_CLOEXEC);
- }
-
- return 0;
-}
-
-int camel_lock_helper_lock(const char *path, CamelException *ex)
-{
- struct _CamelLockHelperMsg *msg;
- int len = strlen(path);
- int res = -1;
- int retry = 3;
-
- LOCK();
-
- if (lock_helper_pid == -1) {
- if (camel_lock_helper_init(ex) == -1) {
- UNLOCK();
- return -1;
- }
- }
-
- msg = alloca(len + sizeof(*msg));
-again:
- msg->magic = CAMEL_LOCK_HELPER_MAGIC;
- msg->seq = lock_sequence;
- msg->id = CAMEL_LOCK_HELPER_LOCK;
- msg->data = len;
- memcpy(msg+1, path, len);
-
- write_n(lock_stdin_pipe[1], msg, len+sizeof(*msg));
-
- do {
- /* should also have a timeout here? cancellation? */
- len = read_n(lock_stdout_pipe[0], msg, sizeof(*msg));
- if (len == 0) {
- /* child quit, do we try ressurect it? */
- res = CAMEL_LOCK_HELPER_STATUS_PROTOCOL;
- /* if the child exited, this should get it, waidpid returns 0 if the child hasn't */
- if (waitpid(lock_helper_pid, NULL, WNOHANG) > 0) {
- lock_helper_pid = -1;
- close(lock_stdout_pipe[0]);
- close(lock_stdin_pipe[1]);
- lock_stdout_pipe[0] = -1;
- lock_stdin_pipe[1] = -1;
- }
- goto fail;
- }
-
- if (msg->magic != CAMEL_LOCK_HELPER_RETURN_MAGIC
- || msg->seq > lock_sequence) {
- res = CAMEL_LOCK_HELPER_STATUS_PROTOCOL;
- d(printf("lock child protocol error\n"));
- camel_exception_setv(ex, CAMEL_EXCEPTION_SYSTEM,
- _("Could not lock '%s': protocol error with lock-helper"), path);
- goto fail;
- }
- } while (msg->seq < lock_sequence);
-
- if (msg->seq == lock_sequence) {
- switch(msg->id) {
- case CAMEL_LOCK_HELPER_STATUS_OK:
- d(printf("lock child locked ok, id is %d\n", msg->data));
- res = msg->data;
- break;
- default:
- camel_exception_setv(ex, CAMEL_EXCEPTION_SYSTEM,
- _("Could not lock '%s'"), path);
- d(printf("locking failed ! status = %d\n", msg->id));
- break;
- }
- } else if (retry > 0) {
- d(printf("sequence failure, lost message? retry?\n"));
- retry--;
- goto again;
- } else {
- camel_exception_setv(ex, CAMEL_EXCEPTION_SYSTEM,
- _("Could not lock '%s': protocol error with lock-helper"), path);
- }
-
-fail:
- lock_sequence++;
-
- UNLOCK();
-
- return res;
-}
-
-int camel_lock_helper_unlock(int lockid)
-{
- struct _CamelLockHelperMsg *msg;
- int res = -1;
- int retry = 3;
- int len;
-
- d(printf("unlocking lock id %d\n", lockid));
-
- LOCK();
-
- /* impossible to unlock if we haven't locked yet */
- if (lock_helper_pid == -1) {
- UNLOCK();
- return -1;
- }
-
- msg = alloca(sizeof(*msg));
-again:
- msg->magic = CAMEL_LOCK_HELPER_MAGIC;
- msg->seq = lock_sequence;
- msg->id = CAMEL_LOCK_HELPER_UNLOCK;
- msg->data = lockid;
-
- write_n(lock_stdin_pipe[1], msg, sizeof(*msg));
-
- do {
- /* should also have a timeout here? cancellation? */
- len = read_n(lock_stdout_pipe[0], msg, sizeof(*msg));
- if (len == 0) {
- /* child quit, do we try ressurect it? */
- res = CAMEL_LOCK_HELPER_STATUS_PROTOCOL;
- if (waitpid(lock_helper_pid, NULL, WNOHANG) > 0) {
- lock_helper_pid = -1;
- close(lock_stdout_pipe[0]);
- close(lock_stdin_pipe[1]);
- lock_stdout_pipe[0] = -1;
- lock_stdin_pipe[1] = -1;
- }
- goto fail;
- }
-
- if (msg->magic != CAMEL_LOCK_HELPER_RETURN_MAGIC
- || msg->seq > lock_sequence) {
- goto fail;
- }
- } while (msg->seq < lock_sequence);
-
- if (msg->seq == lock_sequence) {
- switch(msg->id) {
- case CAMEL_LOCK_HELPER_STATUS_OK:
- d(printf("lock child unlocked ok\n"));
- res = 0;
- break;
- default:
- d(printf("locking failed ! \n"));
- break;
- }
- } else if (retry > 0) {
- d(printf("sequence failure, lost message? retry?\n"));
- lock_sequence++;
- retry--;
- goto again;
- }
-
-fail:
- lock_sequence++;
-
- UNLOCK();
-
- return res;
-}
-
-#if 0
-int main(int argc, char **argv)
-{
- int id1, id2;
-
- d(printf("locking started\n"));
- camel_lock_helper_init();
-
- id1 = camel_lock_helper_lock("1 path 1");
- if (id1 != -1) {
- d(printf("lock ok, unlock\n"));
- camel_lock_helper_unlock(id1);
- }
-
- id1 = camel_lock_helper_lock("2 path 1");
- id2 = camel_lock_helper_lock("2 path 2");
- camel_lock_helper_unlock(id2);
- camel_lock_helper_unlock(id1);
-
- id1 = camel_lock_helper_lock("3 path 1");
- id2 = camel_lock_helper_lock("3 path 2");
- camel_lock_helper_unlock(id1);
-}
-#endif
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