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
|
/* Linux wait4 syscall implementation.
Copyright (C) 2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <sys/wait.h>
#include <sys/resource.h>
#include <sysdep-cancel.h>
__pid_t
__wait4 (__pid_t pid, int *stat_loc, int options, struct rusage *usage)
{
#if __NR_wait4
return SYSCALL_CANCEL (wait4, pid, stat_loc, options, usage);
#else
idtype_t idtype = P_PID;
if (pid < -1)
{
idtype = P_PGID;
pid *= -1;
}
else if (pid == -1)
{
idtype = P_ALL;
}
else if (pid == 0)
{
/* Linux Kernels 5.4 support pid 0 with P_PGID to specify wait on
* the current PID's group. Earlier kernels will return -EINVAL.
*/
idtype = P_PGID;
}
options |= WEXITED;
siginfo_t infop;
if (SYSCALL_CANCEL (waitid, idtype, pid, &infop, options, usage) < 0)
return -1;
if (stat_loc)
{
*stat_loc = 0;
switch (infop.si_code)
{
case CLD_EXITED:
*stat_loc = W_EXITCODE (infop.si_status, 0);
break;
case CLD_DUMPED:
*stat_loc = WCOREDUMP (infop.si_signo);
/* Fallthrough */
case CLD_KILLED:
*stat_loc |= infop.si_status;
break;
case CLD_TRAPPED:
case CLD_STOPPED:
*stat_loc = W_STOPCODE (infop.si_status);
break;
case CLD_CONTINUED:
*stat_loc = 0xffff;
break;
default:
*stat_loc = 0;
break;
}
}
return infop.si_pid;
#endif
}
weak_alias (__wait4, wait4)
|
