lib/tsocket: add some useful helper functions

metze

1 files changed, 177 insertions, 0 deletions

diff --git a/lib/tsocket/tsocket_helpers.c b/lib/tsocket/tsocket_helpers.c
new file mode 100644
index 0000000000..b2edf43d97
--- /dev/null
+++ b/lib/tsocket/tsocket_helpers.c
@@ -0,0 +1,177 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   Copyright (C) Stefan Metzmacher 2009
+
+     ** NOTE! The following LGPL license applies to the tevent
+     ** library. This does NOT imply that all of Samba is released
+     ** under the LGPL
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 3 of the License, or (at your option) any later version.
+
+   This library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "replace.h"
+#include "system/network.h"
+#include "system/filesys.h"
+#include "tsocket.h"
+#include "tsocket_internal.h"
+
+int tsocket_error_from_errno(int ret,
+			     int sys_errno,
+			     bool *retry)
+{
+	*retry = false;
+
+	if (ret >= 0) {
+		return 0;
+	}
+
+	if (ret != -1) {
+		return EIO;
+	}
+
+	if (sys_errno == 0) {
+		return EIO;
+	}
+
+	if (sys_errno == EINTR) {
+		*retry = true;
+		return sys_errno;
+	}
+
+	if (sys_errno == EINPROGRESS) {
+		*retry = true;
+		return sys_errno;
+	}
+
+	if (sys_errno == EAGAIN) {
+		*retry = true;
+		return sys_errno;
+	}
+
+#ifdef EWOULDBLOCK
+	if (sys_errno == EWOULDBLOCK) {
+		*retry = true;
+		return sys_errno;
+	}
+#endif
+
+	return sys_errno;
+}
+
+int tsocket_simple_int_recv(struct tevent_req *req, int *perrno)
+{
+	enum tevent_req_state state;
+	uint64_t error;
+
+	if (!tevent_req_is_error(req, &state, &error)) {
+		return 0;
+	}
+
+	switch (state) {
+	case TEVENT_REQ_NO_MEMORY:
+		*perrno = ENOMEM;
+		return -1;
+	case TEVENT_REQ_TIMED_OUT:
+		*perrno = ETIMEDOUT;
+		return -1;
+	case TEVENT_REQ_USER_ERROR:
+		*perrno = (int)error;
+		return -1;
+	default:
+		*perrno = EIO;
+		return -1;
+	}
+
+	*perrno = EIO;
+	return -1;
+}
+
+int tsocket_common_prepare_fd(int fd, bool high_fd)
+{
+	int i;
+	int sys_errno = 0;
+	int fds[3];
+	int num_fds = 0;
+
+	int result, flags;
+
+	if (fd == -1) {
+		return -1;
+	}
+
+	/* first make a fd >= 3 */
+	if (high_fd) {
+		while (fd < 3) {
+			fds[num_fds++] = fd;
+			fd = dup(fd);
+			if (fd == -1) {
+				sys_errno = errno;
+				break;
+			}
+		}
+		for (i=0; i<num_fds; i++) {
+			close(fds[i]);
+		}
+		if (fd == -1) {
+			errno = sys_errno;
+			return fd;
+		}
+	}
+
+	/* fd should be nonblocking. */
+
+#ifdef O_NONBLOCK
+#define FLAG_TO_SET O_NONBLOCK
+#else
+#ifdef SYSV
+#define FLAG_TO_SET O_NDELAY
+#else /* BSD */
+#define FLAG_TO_SET FNDELAY
+#endif
+#endif
+
+	if ((flags = fcntl(fd, F_GETFL)) == -1) {
+		goto fail;
+	}
+
+	flags |= FLAG_TO_SET;
+	if (fcntl(fd, F_SETFL, flags) == -1) {
+		goto fail;
+	}
+
+#undef FLAG_TO_SET
+
+	/* fd should be closed on exec() */
+#ifdef FD_CLOEXEC
+	result = flags = fcntl(fd, F_GETFD, 0);
+	if (flags >= 0) {
+		flags |= FD_CLOEXEC;
+		result = fcntl(fd, F_SETFD, flags);
+	}
+	if (result < 0) {
+		goto fail;
+	}
+#endif
+	return fd;
+
+ fail:
+	if (fd != -1) {
+		sys_errno = errno;
+		close(fd);
+		errno = sys_errno;
+	}
+	return -1;
+}
+