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d7bae0edce
When changing so that the client passes its stdout and stderr as well as stdin up to the server, I forgot one essential point - the tmux server could now be both the producer and consumer. This happens when tmux is run inside tmux, as well as when piping tmux commands together. So, using stdio(3) was a bad idea - if sufficient data was written, this could block in write(2). When that happened and the server was both producer and consumer, it deadlocks. Change to use libevent bufferevents for the client stdin, stdout and stderr instead. This is trivial enough for output but requires a callback mechanism to trigger when stdin is finished. This relies on the underlying polling mechanism for libevent to work with whatever devices to which the user could redirect stdin, stdout or stderr, hence the change to use poll(2) over kqueue(2) for tmux.
185 lines
4.4 KiB
C
185 lines
4.4 KiB
C
/* $Id: cmd-load-buffer.c,v 1.17 2010-08-09 21:44:25 tcunha Exp $ */
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/*
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* Copyright (c) 2009 Tiago Cunha <me@tiagocunha.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <errno.h>
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#include <stdio.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 "tmux.h"
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/*
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* Loads a session paste buffer from a file.
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*/
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int cmd_load_buffer_exec(struct cmd *, struct cmd_ctx *);
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void cmd_load_buffer_callback(struct client *, void *);
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const struct cmd_entry cmd_load_buffer_entry = {
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"load-buffer", "loadb",
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CMD_BUFFER_SESSION_USAGE " path",
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CMD_ARG1, "",
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cmd_buffer_init,
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cmd_buffer_parse,
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cmd_load_buffer_exec,
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cmd_buffer_free,
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cmd_buffer_print
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};
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struct cmd_load_buffer_cdata {
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struct session *session;
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int buffer;
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};
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int
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cmd_load_buffer_exec(struct cmd *self, struct cmd_ctx *ctx)
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{
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struct cmd_buffer_data *data = self->data;
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struct cmd_load_buffer_cdata *cdata;
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struct session *s;
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struct client *c = ctx->cmdclient;
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FILE *f;
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char *pdata, *new_pdata;
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size_t psize;
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u_int limit;
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int ch;
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if ((s = cmd_find_session(ctx, data->target)) == NULL)
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return (-1);
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if (strcmp(data->arg, "-") == 0) {
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if (c == NULL) {
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ctx->error(ctx, "%s: can't read from stdin", data->arg);
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return (-1);
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}
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if (c->flags & CLIENT_TERMINAL) {
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ctx->error(ctx, "%s: stdin is a tty", data->arg);
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return (-1);
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}
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if (c->stdin_fd == -1) {
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ctx->error(ctx, "%s: can't read from stdin", data->arg);
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return (-1);
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}
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cdata = xmalloc(sizeof *cdata);
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cdata->session = s;
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cdata->buffer = data->buffer;
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c->stdin_data = cdata;
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c->stdin_callback = cmd_load_buffer_callback;
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c->references++;
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bufferevent_enable(c->stdin_event, EV_READ);
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return (1);
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}
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if ((f = fopen(data->arg, "rb")) == NULL) {
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ctx->error(ctx, "%s: %s", data->arg, strerror(errno));
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return (-1);
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}
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pdata = NULL;
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psize = 0;
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while ((ch = getc(f)) != EOF) {
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/* Do not let the server die due to memory exhaustion. */
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if ((new_pdata = realloc(pdata, psize + 2)) == NULL) {
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ctx->error(ctx, "realloc error: %s", strerror(errno));
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goto error;
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}
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pdata = new_pdata;
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pdata[psize++] = ch;
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}
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if (ferror(f)) {
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ctx->error(ctx, "%s: read error", data->arg);
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goto error;
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}
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if (pdata != NULL)
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pdata[psize] = '\0';
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fclose(f);
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f = NULL;
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limit = options_get_number(&s->options, "buffer-limit");
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if (data->buffer == -1) {
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paste_add(&s->buffers, pdata, psize, limit);
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return (0);
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}
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if (paste_replace(&s->buffers, data->buffer, pdata, psize) != 0) {
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ctx->error(ctx, "no buffer %d", data->buffer);
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return (-1);
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}
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return (0);
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error:
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if (pdata != NULL)
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xfree(pdata);
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if (f != NULL)
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fclose(f);
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return (-1);
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}
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void
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cmd_load_buffer_callback(struct client *c, void *data)
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{
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struct cmd_load_buffer_cdata *cdata = data;
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struct session *s = cdata->session;
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char *pdata;
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size_t psize;
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u_int limit;
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int idx;
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/*
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* Event callback has already checked client is not dead and reduced
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* its reference count. But tell it to exit.
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*/
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c->flags |= CLIENT_EXIT;
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/* Does the target session still exist? */
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if (session_index(s, &idx) != 0)
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goto out;
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psize = EVBUFFER_LENGTH(c->stdin_event->input);
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if (psize == 0)
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goto out;
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pdata = malloc(psize + 1);
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if (pdata == NULL)
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goto out;
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bufferevent_read(c->stdin_event, pdata, psize);
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pdata[psize] = '\0';
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limit = options_get_number(&s->options, "buffer-limit");
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if (cdata->buffer == -1) {
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paste_add(&s->buffers, pdata, psize, limit);
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goto out;
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}
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if (paste_replace(&s->buffers, cdata->buffer, pdata, psize) != 0) {
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/* No context so can't use server_client_msg_error. */
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evbuffer_add_printf(
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c->stderr_event->output, "no buffer %d\n", cdata->buffer);
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bufferevent_enable(c->stderr_event, EV_WRITE);
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goto out;
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}
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out:
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xfree(cdata);
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}
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