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* lin-lwp.c, thread-db.c, defs.h, cris-tdep.c: Replace ``Linux''
with either ``GNU/Linux'' or ``Linux kernel''. Fix PR gdb/378.
This commit is contained in:
@@ -1,4 +1,4 @@
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/* Multi-threaded debugging support for Linux (LWP layer).
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/* Multi-threaded debugging support for GNU/Linux (LWP layer).
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Copyright 2000, 2001 Free Software Foundation, Inc.
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This file is part of GDB.
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@@ -35,38 +35,38 @@
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static int debug_lin_lwp;
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extern const char *strsignal (int sig);
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/* On Linux there are no real LWP's. The closest thing to LWP's are
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processes sharing the same VM space. A multi-threaded process is
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basically a group of such processes. However, such a grouping is
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almost entirely a user-space issue; the kernel doesn't enforce such
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a grouping at all (this might change in the future). In general,
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we'll rely on the threads library (i.e. the LinuxThreads library)
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to provide such a grouping.
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/* On GNU/Linux there are no real LWP's. The closest thing to LWP's
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are processes sharing the same VM space. A multi-threaded process
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is basically a group of such processes. However, such a grouping
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is almost entirely a user-space issue; the kernel doesn't enforce
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such a grouping at all (this might change in the future). In
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general, we'll rely on the threads library (i.e. the GNU/Linux
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Threads library) to provide such a grouping.
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It is perfectly well possible to write a multi-threaded application
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without the assistance of a threads library, by using the clone
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system call directly. This module should be able to give some
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rudimentary support for debugging such applications if developers
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specify the CLONE_PTRACE flag in the clone system call, and are
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using Linux 2.4 or above.
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using the Linux kernel 2.4 or above.
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Note that there are some peculiarities in Linux that affect this
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code:
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Note that there are some peculiarities in GNU/Linux that affect
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this code:
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- In general one should specify the __WCLONE flag to waitpid in
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order to make it report events for any of the cloned processes
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(and leave it out for the initial process). However, if a cloned
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process has exited the exit status is only reported if the
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__WCLONE flag is absent. Linux 2.4 has a __WALL flag, but we
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cannot use it since GDB must work on older systems too.
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__WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but
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we cannot use it since GDB must work on older systems too.
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- When a traced, cloned process exits and is waited for by the
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debugger, the kernel reassigns it to the original parent and
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keeps it around as a "zombie". Somehow, the LinuxThreads library
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doesn't notice this, which leads to the "zombie problem": When
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debugged a multi-threaded process that spawns a lot of threads
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will run out of processes, even if the threads exit, because the
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"zombies" stay around. */
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keeps it around as a "zombie". Somehow, the GNU/Linux Threads
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library doesn't notice this, which leads to the "zombie problem":
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When debugged a multi-threaded process that spawns a lot of
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threads will run out of processes, even if the threads exit,
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because the "zombies" stay around. */
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/* Structure describing a LWP. */
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struct lwp_info
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@@ -293,7 +293,7 @@ iterate_over_lwps (int (*callback) (struct lwp_info *, void *), void *data)
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}
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/* Implementation of the PREPARE_TO_PROCEED hook for the Linux LWP
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/* Implementation of the PREPARE_TO_PROCEED hook for the GNU/Linux LWP
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layer.
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Note that this implementation is potentially redundant now that
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@@ -1476,7 +1476,7 @@ _initialize_lin_lwp (void)
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add_show_from_set (add_set_cmd ("lin-lwp", no_class, var_zinteger,
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(char *) &debug_lin_lwp,
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"Set debugging of linux lwp module.\n\
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"Set debugging of GNU/Linux lwp module.\n\
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Enables printf debugging output.\n",
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&setdebuglist),
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&showdebuglist);
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@@ -1484,7 +1484,8 @@ Enables printf debugging output.\n",
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/* FIXME: kettenis/2000-08-26: The stuff on this page is specific to
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the LinuxThreads library and therefore doesn't really belong here. */
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the GNU/Linux Threads library and therefore doesn't really belong
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here. */
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/* Read variable NAME in the target and return its value if found.
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Otherwise return zero. It is assumed that the type of the variable
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@@ -1528,10 +1529,11 @@ lin_thread_get_thread_signals (sigset_t *set)
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sigaddset (set, restart);
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sigaddset (set, cancel);
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/* The LinuxThreads library makes terminating threads send a special
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"cancel" signal instead of SIGCHLD. Make sure we catch those (to
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prevent them from terminating GDB itself, which is likely to be
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their default action) and treat them the same way as SIGCHLD. */
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/* The GNU/Linux Threads library makes terminating threads send a
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special "cancel" signal instead of SIGCHLD. Make sure we catch
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those (to prevent them from terminating GDB itself, which is
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likely to be their default action) and treat them the same way as
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SIGCHLD. */
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action.sa_handler = sigchld_handler;
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sigemptyset (&action.sa_mask);
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