~kevin8t8/mutt

ref: mutt-1-13-1-rel mutt/filter.c -rw-r--r-- 4.0 KiB View raw
60dd8986Kevin McCarthy automatic post-release commit for mutt-1.13.1 6 months ago
                                                                                
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
/*
 * Copyright (C) 1996-2000 Michael R. Elkins.
 *
 *     This program is free software; you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation; either version 2 of the License, or
 *     (at your option) any later version.
 *
 *     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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#if HAVE_CONFIG_H
# include "config.h"
#endif

#include "mutt.h"
#include "mutt_curses.h"
#ifdef USE_IMAP
# include "imap.h"
#endif

#include <unistd.h>
#include <stdlib.h>
#include <sys/wait.h>

/* Invokes a command on a pipe and optionally connects its stdin and stdout
 * to the specified handles.
 */
pid_t
mutt_create_filter_fd (const char *cmd, FILE **in, FILE **out, FILE **err,
		       int fdin, int fdout, int fderr)
{
  int pin[2], pout[2], perr[2], thepid;
  char columns[11];

  if (in)
  {
    *in = 0;
    if (pipe (pin) == -1)
      return (-1);
  }

  if (out)
  {
    *out = 0;
    if (pipe (pout) == -1)
    {
      if (in)
      {
	close (pin[0]);
	close (pin[1]);
      }
      return (-1);
    }
  }

  if (err)
  {
    *err = 0;
    if (pipe (perr) == -1)
    {
      if (in)
      {
	close (pin[0]);
	close (pin[1]);
      }
      if (out)
      {
	close (pout[0]);
	close (pout[1]);
      }
      return (-1);
    }
  }

  mutt_block_signals_system ();

  if ((thepid = fork ()) == 0)
  {
    mutt_unblock_signals_system (0);

    if (in)
    {
      close (pin[1]);
      dup2 (pin[0], 0);
      close (pin[0]);
    }
    else if (fdin != -1)
    {
      dup2 (fdin, 0);
      close (fdin);
    }

    if (out)
    {
      close (pout[0]);
      dup2 (pout[1], 1);
      close (pout[1]);
    }
    else if (fdout != -1)
    {
      dup2 (fdout, 1);
      close (fdout);
    }

    if (err)
    {
      close (perr[0]);
      dup2 (perr[1], 2);
      close (perr[1]);
    }
    else if (fderr != -1)
    {
      dup2 (fderr, 2);
      close (fderr);
    }

    if (MuttIndexWindow && (MuttIndexWindow->cols > 0))
    {
      snprintf (columns, sizeof (columns), "%d", MuttIndexWindow->cols);
      mutt_envlist_set ("COLUMNS", columns, 1);
    }

    execle (EXECSHELL, "sh", "-c", cmd, NULL, mutt_envlist ());
    _exit (127);
  }
  else if (thepid == -1)
  {
    mutt_unblock_signals_system (1);

    if (in)
    {
      close (pin[0]);
      close (pin[1]);
    }

    if (out)
    {
      close (pout[0]);
      close (pout[1]);
    }

    if (err)
    {
      close (perr[0]);
      close (perr[1]);
    }

    return (-1);
  }

  if (out)
  {
    close (pout[1]);
    *out = fdopen (pout[0], "r");
  }

  if (in)
  {
    close (pin[0]);
    *in = fdopen (pin[1], "w");
  }

  if (err)
  {
    close (perr[1]);
    *err = fdopen (perr[0], "r");
  }

  return (thepid);
}

pid_t mutt_create_filter (const char *s, FILE **in, FILE **out, FILE **err)
{
  return (mutt_create_filter_fd (s, in, out, err, -1, -1, -1));
}

int mutt_wait_filter (pid_t pid)
{
  int rc;

  waitpid (pid, &rc, 0);
  mutt_unblock_signals_system (1);
  rc = WIFEXITED (rc) ? WEXITSTATUS (rc) : -1;

  return rc;
}

/*
 * This is used for filters that are actually interactive commands
 * with input piped in: e.g. in mutt_view_attachment(), a mailcap
 * entry without copiousoutput _and_ without a %s.
 *
 * For those cases, we treat it like a blocking system command, and
 * poll IMAP to keep connections open.
 */
int mutt_wait_interactive_filter (pid_t pid)
{
  int rc;

#ifndef USE_IMAP
  waitpid (pid, &rc, 0);
#else
  rc = imap_wait_keepalive (pid);
#endif
  mutt_unblock_signals_system (1);
  rc = WIFEXITED (rc) ? WEXITSTATUS (rc) : -1;

  return rc;
}