068119a6c3
UVT is based heavily on the old cdev-sessions. It uses CUSE/FUSE to implement virtual terminals in user-space. This move into a library allows to use it in other projects, too. There is no reason to limit it to kmscon sessions. In fact, we will remove the cdev-sessions, soon and make kmscon a stand-alone terminal emulator without any session capability. Instead, the uvtd program will provide the VT emulation. This library is not finished, nor ready for use. However, feel free to contribute patches so we can eventually release a stable API. Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
/*
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* UVT - Userspace Virtual Terminals
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*
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* Copyright (c) 2011-2013 David Herrmann <dh.herrmann@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* UVT Contexts
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* A UVT context is used to provide basic infrastructure for all other UVT
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* objects. It allows easy integration of multiple UVT objects into a single
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* application.
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*/
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#include <eloop.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "shl_llog.h"
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#include "uvt.h"
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#include "uvt_internal.h"
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#define LLOG_SUBSYSTEM "uvt_ctx"
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int uvt_ctx_new(struct uvt_ctx **out, uvt_log_t log, void *log_data)
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{
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struct uvt_ctx *ctx;
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int ret;
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if (!out)
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return llog_dEINVAL(log, log_data);
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ctx = malloc(sizeof(*ctx));
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if (!ctx)
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return llog_dENOMEM(log, log_data);
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memset(ctx, 0, sizeof(*ctx));
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ctx->ref = 1;
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ctx->llog = log;
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ctx->llog_data = log_data;
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llog_debug(ctx, "new ctx %p", ctx);
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ret = ev_eloop_new(&ctx->eloop, ctx->llog, ctx->llog_data);
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if (ret)
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goto err_free;
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ctx->cuse_file = strdup("/dev/cuse");
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if (!ctx->cuse_file) {
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ret = llog_ENOMEM(ctx);
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goto err_eloop;
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}
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*out = ctx;
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return 0;
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err_eloop:
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ev_eloop_unref(ctx->eloop);
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err_free:
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free(ctx);
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return ret;
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}
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void uvt_ctx_ref(struct uvt_ctx *ctx)
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{
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if (!ctx || !ctx->ref)
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return;
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++ctx->ref;
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}
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void uvt_ctx_unref(struct uvt_ctx *ctx)
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{
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if (!ctx || !ctx->ref || --ctx->ref)
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return;
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llog_debug(ctx, "free ctx %p", ctx);
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free(ctx->cuse_file);
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ev_eloop_unref(ctx->eloop);
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free(ctx);
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}
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int uvt_ctx_get_fd(struct uvt_ctx *ctx)
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{
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if (!ctx)
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return -1;
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return ev_eloop_get_fd(ctx->eloop);
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}
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void uvt_ctx_dispatch(struct uvt_ctx *ctx)
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{
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if (!ctx)
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return;
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ev_eloop_dispatch(ctx->eloop, 0);
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}
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