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
|
/*
* \/\/\
*
* Copyright (C) 2012-2018 Vito Caputo - <vcaputo@pengaru.com>
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
/* launching of external processes / X clients */
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/resource.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include "launch.h"
#include "vwm.h"
#include "window.h"
#include "xwindow.h"
#define LAUNCHED_RELATIVE_PRIORITY 10 /* the wm priority plus this is used as the priority of launched processes */
/* return an interpolated copy of arg */
static char * arg_interpolate(const vwm_t *vwm, const char *arg)
{
FILE *memfp;
char *xarg = NULL;
size_t xarglen;
int fmt = 0;
assert(vwm);
assert(arg);
/* this came from vmon.c, it'd be nice if they could share */
memfp = open_memstream(&xarg, &xarglen);
if (!memfp) {
VWM_PERROR("unable to create memstream");
return NULL;
}
for (size_t i = 0; arg[i]; i++) {
char c = arg[i];
if (!fmt) {
if (c == '%')
fmt = 1;
else
fputc(c, memfp);
continue;
}
switch (c) {
case 'W': { /* focused X window id in hex, root window if nothing focused */
vwm_window_t *vwin;
Window winid;
vwin = vwm_win_get_focused(vwm);
if (vwin)
winid = vwin->xwindow->id;
else
winid = VWM_XROOT(vwm);
fprintf(memfp, "%#x", (unsigned)winid);
break;
}
case '%': /* literal % */
fputc(c, memfp);
break;
default:
VWM_ERROR("Unrecognized specifier \'%c\'", c);
goto _err;
}
fmt = 0;
}
fclose(memfp);
return xarg;
_err:
fclose(memfp);
free(xarg);
return NULL;
}
static char ** args_interpolate(vwm_t *vwm, char **argv)
{
char **args;
int n_args;
assert(vwm);
assert(argv);
for (n_args = 0; argv[n_args]; n_args++);
args = calloc(n_args + 1, sizeof(*args));
if (!args)
return NULL;
for (int i = 0; i < n_args; i++) {
args[i] = arg_interpolate(vwm, argv[i]);
if (!args[i]) {
for (int j = 0; j < n_args; j++)
free(args[j]);
free(args);
return NULL;
}
}
return args;
}
static void args_free(char **args)
{
assert(args);
for (int i = 0; args[i]; i++)
free(args[i]);
free(args);
}
/* launch a child command specified in argv, mode decides if we wait for the child to exit before returning. */
void vwm_launch(vwm_t *vwm, char **argv, vwm_launch_mode_t mode)
{
char **args;
args = args_interpolate(vwm, argv);
if (!args)
return;
/* XXX: in BG mode I double fork and let init inherit the orphan so I don't have to collect the return status */
if (mode == VWM_LAUNCH_MODE_FG || !fork()) {
if (!fork()) {
/* child */
setpriority(PRIO_PROCESS, getpid(), vwm->priority + LAUNCHED_RELATIVE_PRIORITY);
execvp(args[0], args);
}
if (mode == VWM_LAUNCH_MODE_BG)
exit(0);
}
wait(NULL); /* TODO: could wait for the specific pid, particularly in FG mode ... */
args_free(args);
}
|
