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linux-waitpid.c
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1 /* Wrapper implementation for waitpid for GNU/Linux (LWP layer).
2
3 Copyright (C) 2001-2018 Free Software Foundation, Inc.
4
5 This file is part of GDB.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19
20 #include "common-defs.h"
21
22 #ifdef GDBSERVER
23 /* FIXME: server.h is required for the definition of debug_threads
24 which is used in the gdbserver-specific debug printing in
25 linux_debug. This code should be made available to GDB also,
26 but the lack of a suitable flag to enable it prevents this. */
27 #include "server.h"
28 #endif
29
30 #include "linux-nat.h"
31 #include "linux-waitpid.h"
32 #include "gdb_wait.h"
33
34 /* Print debugging output based on the format string FORMAT and
35 its parameters. */
36
37 static inline void ATTRIBUTE_PRINTF (1,2)
38 linux_debug (const char *format, ...)
39 {
40 #ifdef GDBSERVER
41 if (debug_threads)
42 {
43 va_list args;
44 va_start (args, format);
45 vfprintf (stderr, format, args);
46 va_end (args);
47 }
48 #endif
49 }
50
51 /* Convert wait status STATUS to a string. Used for printing debug
52 messages only. */
53
54 char *
55 status_to_str (int status)
56 {
57 static char buf[64];
58
59 if (WIFSTOPPED (status))
60 {
61 if (WSTOPSIG (status) == SYSCALL_SIGTRAP)
62 snprintf (buf, sizeof (buf), "%s (stopped at syscall)",
63 strsignal (SIGTRAP));
64 else
65 snprintf (buf, sizeof (buf), "%s (stopped)",
66 strsignal (WSTOPSIG (status)));
67 }
68 else if (WIFSIGNALED (status))
69 snprintf (buf, sizeof (buf), "%s (terminated)",
70 strsignal (WTERMSIG (status)));
71 else
72 snprintf (buf, sizeof (buf), "%d (exited)", WEXITSTATUS (status));
73
74 return buf;
75 }
76
77 /* See linux-waitpid.h. */
78
79 int
80 my_waitpid (int pid, int *status, int flags)
81 {
82 int ret, out_errno;
83
84 linux_debug ("my_waitpid (%d, 0x%x)\n", pid, flags);
85
86 do
87 {
88 ret = waitpid (pid, status, flags);
89 }
90 while (ret == -1 && errno == EINTR);
91 out_errno = errno;
92
93 linux_debug ("my_waitpid (%d, 0x%x): status(%x), %d\n",
94 pid, flags, (ret > 0 && status != NULL) ? *status : -1, ret);
95
96 errno = out_errno;
97 return ret;
98 }
debug_threads
int debug_threads
Definition: debug.c:24
SYSCALL_SIGTRAP
#define SYSCALL_SIGTRAP
Definition: linux-nat.h:36
WSTOPSIG
#define WSTOPSIG
Definition: gdb_wait.h:75
linux-waitpid.h
WTERMSIG
#define WTERMSIG(w)
Definition: gdb_wait.h:71
server.h
common-defs.h
WEXITSTATUS
#define WEXITSTATUS(w)
Definition: gdb_wait.h:67
status_to_str
char * status_to_str(int status)
Definition: linux-waitpid.c:55
errno
#define errno
Definition: wincecompat.h:24
WIFSTOPPED
#define WIFSTOPPED(w)
Definition: gdb_wait.h:62
my_waitpid
int my_waitpid(int pid, int *status, int flags)
Definition: linux-waitpid.c:80
gdb_wait.h
WIFSIGNALED
#define WIFSIGNALED(w)
Definition: gdb_wait.h:48
ATTRIBUTE_PRINTF
static void ATTRIBUTE_PRINTF(1, 2)
Definition: linux-waitpid.c:37
linux-nat.h