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Pedro Alves 49940788ab Always switch fork child to the main UI
The following scenario:

 - gdb started in normal CLI mode.

 - separate MI channel created with new-ui

 - inferior output redirected with the "set inferior-tty" command.

 - use -exec-run in the MI channel to run the inferior

is presently mishandled.

When we create the inferior, in fork-child.c, right after vfork, we'll
close all the file descriptors in the vfork child, and then dup the
tty to file descriptors 0/1/2, create a session, etc.  Note that when
we close all descriptors, we close the file descriptors behind
gdb_stdin/gdb_stdout/gdb_stderr of all secondary UIs...  So if
anything goes wrong in the child and it calls warning/error, it'll end
up writting to the current UI's stdout/stderr streams, which are
backed by file descriptors that have since been closed.  Because this
happens in a vfork region, the corresponding stdin/stdout/stderr in
the parent/gdb end up corrupted.

The fix is to switch to the main UI right after the vfork, so that
gdb_stdin/gdb_stdout/gdb_stderr are correctly mapped to
stdin/stdout/stderr (and thus to file descriptors 0/1/2), so this code
works as it has always worked.

(Technically, we're doing a lot of stuff we shouldn't be doing after a
vfork, while we should only be calling async-signal-safe functions.)

gdb/ChangeLog:
2016-06-21  Pedro Alves  <palves@redhat.com>

	* fork-child.c (fork_inferior): Switch the child to the main UI
	right after vfork.  Save/restore the current UI in the parent.
	Flush outputs of the main UI instead of the current UI.

gdb/testsuite/ChangeLog:
2016-06-21  Pedro Alves  <palves@redhat.com>

	* gdb.mi/mi-exec-run.exp: New file.
2016-06-21 01:11:57 +01:00
bfd Automatic date update in version.in 2016-06-21 00:00:18 +00:00
binutils
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elfcpp Add support for MIPS .rld_map section. 2016-06-20 12:16:26 -07:00
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gas MIPS/GAS/testsuite: Uniquely identify MIPS64r6 tests 2016-06-20 23:43:24 +01:00
gdb Always switch fork child to the main UI 2016-06-21 01:11:57 +01:00
gold gold/x86: Handle output without PLT 2016-06-20 12:28:32 -07:00
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ld Use the IR symbol table for the IR input object 2016-06-20 05:10:46 -07:00
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		   README for GNU development tools

This directory contains various GNU compilers, assemblers, linkers, 
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