Recent versions of macOS have a feature called System Integrity
Protection. Among other things, This feature prevents ptrace from
tracing certain programs --- for example, the programs in /bin, which
includes typical shells.
This means that startup-with-shell does not work properly. This is PR
cli/23364. Currently there is a workaround in gdb to disable
startup-with-shell when this feature might be in use.
This patch changes gdb to be a bit more precise about when
startup-with-shell will not work, by checking whether the shell
executable is restricted.
If the shell is restricted, then this patch will also cause gdb to
cache a copy of the shell in the gdb cache directory, and then reset
the SHELL environment variable to point to this copy. This lets
startup-with-shell work again.
Tested on High Sierra by trying to start a program using redirection,
and by running startup-with-shell.exp.
* darwin-nat.c (copied_shell): New global.
(may_have_sip): Rename from should_disable_startup_with_shell.
(copy_shell_to_cache, maybe_cache_shell): New functions.
(darwin_nat_target::create_inferior): Update. Use
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