cmd-if-shell.c

   1 /* $Id: cmd-if-shell.c,v 1.8 2009-11-14 17:56:39 tcunha Exp $ */
   2
   3 /*
   4  * Copyright (c) 2009 Tiago Cunha <me@tiagocunha.org>
   5  * Copyright (c) 2009 Nicholas Marriott <nicm@openbsd.org>
   6  *
   7  * Permission to use, copy, modify, and distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  15  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
  16  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
  17  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 #include <sys/types.h>
  21 #include <sys/wait.h>
  22
  23 #include <string.h>
  24
  25 #include "tmux.h"
  26
  27 /*
  28  * Executes a tmux command if a shell command returns true.
  29  */
  30
  31 int     cmd_if_shell_exec(struct cmd *, struct cmd_ctx *);
  32
  33 void    cmd_if_shell_callback(struct job *);
  34 void    cmd_if_shell_free(void *);
  35
  36 const struct cmd_entry cmd_if_shell_entry = {
  37         "if-shell", "if",
  38         "shell-command command",
  39         CMD_ARG2, "",
  40         cmd_target_init,
  41         cmd_target_parse,
  42         cmd_if_shell_exec,
  43         cmd_target_free,
  44         cmd_target_print
  45 };
  46
  47 struct cmd_if_shell_data {
  48         char            *cmd;
  49         struct cmd_ctx   ctx;
  50 };
  51
  52 int
  53 cmd_if_shell_exec(struct cmd *self, struct cmd_ctx *ctx)
  54 {
  55         struct cmd_target_data          *data = self->data;
  56         struct cmd_if_shell_data        *cdata;
  57         struct job                      *job;
  58
  59         cdata = xmalloc(sizeof *cdata);
  60         cdata->cmd = xstrdup(data->arg2);
  61         memcpy(&cdata->ctx, ctx, sizeof cdata->ctx);
  62
  63         if (ctx->cmdclient != NULL)
  64                 ctx->cmdclient->references++;
  65         if (ctx->curclient != NULL)
  66                 ctx->curclient->references++;
  67
  68         job = job_add(NULL, 0, NULL,
  69             data->arg, cmd_if_shell_callback, cmd_if_shell_free, cdata);
  70         job_run(job);
  71
  72         return (1);     /* don't let client exit */
  73 }
  74
  75 void
  76 cmd_if_shell_callback(struct job *job)
  77 {
  78         struct cmd_if_shell_data        *cdata = job->data;
  79         struct cmd_ctx                  *ctx = &cdata->ctx;
  80         struct cmd_list                 *cmdlist;
  81         char                            *cause;
  82
  83         if (!WIFEXITED(job->status) || WEXITSTATUS(job->status) != 0)
  84                 return;
  85
  86         if (cmd_string_parse(cdata->cmd, &cmdlist, &cause) != 0) {
  87                 if (cause != NULL) {
  88                         ctx->error(ctx, "%s", cause);
  89                         xfree(cause);
  90                 }
  91                 return;
  92         }
  93
  94         if (cmd_list_exec(cmdlist, ctx) < 0) {
  95                 cmd_list_free(cmdlist);
  96                 return;
  97         }
  98
  99         cmd_list_free(cmdlist);
 100 }
 101
 102 void
 103 cmd_if_shell_free(void *data)
 104 {
 105         struct cmd_if_shell_data        *cdata = data;
 106         struct cmd_ctx                  *ctx = &cdata->ctx;
 107
 108         if (ctx->cmdclient != NULL) {
 109                 ctx->cmdclient->references--;
 110                 server_write_client(ctx->cmdclient, MSG_EXIT, NULL, 0);
 111         }
 112         if (ctx->curclient != NULL)
 113                 ctx->curclient->references--;
 114
 115         xfree(cdata->cmd);
 116         xfree(cdata);
 117 }