04cdc3d5cef56ee02f1572a46002f948e20af2c3
1 /* Wrapper implementation for waitpid for GNU/Linux (LWP layer).
3 Copyright (C) 2001-2014 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
20 #include "common-defs.h"
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. */
30 #include "linux-nat.h"
31 #include "linux-waitpid.h"
34 /* Print debugging output based on the format string FORMAT and
38 linux_debug (const char *format
, ...)
44 va_start (args
, format
);
45 vfprintf (stderr
, format
, args
);
51 /* Convert wait status STATUS to a string. Used for printing debug
55 status_to_str (int status
)
59 if (WIFSTOPPED (status
))
61 if (WSTOPSIG (status
) == SYSCALL_SIGTRAP
)
62 snprintf (buf
, sizeof (buf
), "%s (stopped at syscall)",
65 snprintf (buf
, sizeof (buf
), "%s (stopped)",
66 strsignal (WSTOPSIG (status
)));
68 else if (WIFSIGNALED (status
))
69 snprintf (buf
, sizeof (buf
), "%s (terminated)",
70 strsignal (WTERMSIG (status
)));
72 snprintf (buf
, sizeof (buf
), "%d (exited)", WEXITSTATUS (status
));
77 /* Wrapper function for waitpid which handles EINTR, and emulates
78 __WALL for systems where that is not available. */
81 my_waitpid (int pid
, int *status
, int flags
)
85 linux_debug ("my_waitpid (%d, 0x%x)\n", pid
, flags
);
89 sigset_t block_mask
, org_mask
, wake_mask
;
92 wnohang
= (flags
& WNOHANG
) != 0;
93 flags
&= ~(__WALL
| __WCLONE
);
99 /* Block all signals while here. This avoids knowing about
100 LinuxThread's signals. */
101 sigfillset (&block_mask
);
102 sigprocmask (SIG_BLOCK
, &block_mask
, &org_mask
);
104 /* ... except during the sigsuspend below. */
105 sigemptyset (&wake_mask
);
110 /* Since all signals are blocked, there's no need to check
112 ret
= waitpid (pid
, status
, flags
);
115 if (ret
== -1 && out_errno
!= ECHILD
)
120 if (flags
& __WCLONE
)
122 /* We've tried both flavors now. If WNOHANG is set,
123 there's nothing else to do, just bail out. */
127 linux_debug ("blocking\n");
129 /* Block waiting for signals. */
130 sigsuspend (&wake_mask
);
136 sigprocmask (SIG_SETMASK
, &org_mask
, NULL
);
141 ret
= waitpid (pid
, status
, flags
);
142 while (ret
== -1 && errno
== EINTR
);
146 linux_debug ("my_waitpid (%d, 0x%x): status(%x), %d\n",
147 pid
, flags
, status
? *status
: -1, ret
);
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