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/>. */
27 #include "linux-nat.h"
28 #include "linux-waitpid.h"
31 /* Print debugging output based on the format string FORMAT and
35 linux_debug (const char *format
, ...)
41 va_start (args
, format
);
42 vfprintf (stderr
, format
, args
);
46 /* GDB-specific debugging output. */
50 /* Convert wait status STATUS to a string. Used for printing debug
54 status_to_str (int status
)
58 if (WIFSTOPPED (status
))
60 if (WSTOPSIG (status
) == SYSCALL_SIGTRAP
)
61 snprintf (buf
, sizeof (buf
), "%s (stopped at syscall)",
64 snprintf (buf
, sizeof (buf
), "%s (stopped)",
65 strsignal (WSTOPSIG (status
)));
67 else if (WIFSIGNALED (status
))
68 snprintf (buf
, sizeof (buf
), "%s (terminated)",
69 strsignal (WTERMSIG (status
)));
71 snprintf (buf
, sizeof (buf
), "%d (exited)", WEXITSTATUS (status
));
76 /* Wrapper function for waitpid which handles EINTR, and emulates
77 __WALL for systems where that is not available. */
80 my_waitpid (int pid
, int *status
, int flags
)
84 linux_debug ("my_waitpid (%d, 0x%x)\n", pid
, flags
);
88 sigset_t block_mask
, org_mask
, wake_mask
;
91 wnohang
= (flags
& WNOHANG
) != 0;
92 flags
&= ~(__WALL
| __WCLONE
);
98 /* Block all signals while here. This avoids knowing about
99 LinuxThread's signals. */
100 sigfillset (&block_mask
);
101 sigprocmask (SIG_BLOCK
, &block_mask
, &org_mask
);
103 /* ... except during the sigsuspend below. */
104 sigemptyset (&wake_mask
);
109 /* Since all signals are blocked, there's no need to check
111 ret
= waitpid (pid
, status
, flags
);
114 if (ret
== -1 && out_errno
!= ECHILD
)
119 if (flags
& __WCLONE
)
121 /* We've tried both flavors now. If WNOHANG is set,
122 there's nothing else to do, just bail out. */
126 linux_debug ("blocking\n");
128 /* Block waiting for signals. */
129 sigsuspend (&wake_mask
);
135 sigprocmask (SIG_SETMASK
, &org_mask
, NULL
);
140 ret
= waitpid (pid
, status
, flags
);
141 while (ret
== -1 && errno
== EINTR
);
145 linux_debug ("my_waitpid (%d, 0x%x): status(%x), %d\n",
146 pid
, flags
, status
? *status
: -1, ret
);
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