[PATCH v4 5/9] nto_process_target::create_inferior: Pass args as char **

Michael Weghorn
2020-05-13T09:48:21Z

According to [1], the fifth parameter
to the 'spawnp' function is 'char * const argv[]',
so just pass the args contained in the vector as
an array right away, rather than converting that
to a C string first and passing that one.

With commit 2090129c36c7e582943b7d300968d19b46160d84
("Share fork_inferior et al with gdbserver",
2016-12-22) the type had changed from 'char **'
to 'char *', but I can't see an apparent reason for
that, and 'nto_procfs_target::create_inferior'
(in gdb/nto-procfs.c) also passes a 'char **' to
'spawnp' instead.

I do not know much about that target and cannot actually
test this, however.
The main motivation to look at this was identifying
and replacing the remaining uses of the 'stringify_argv'
function which does not properly do escaping.

[1] http://www.qnx.com/developers/docs/7.0.0/#com.qnx.doc.neutrino.lib_ref/topic/s/spawnp.html

gdbserver/ChangeLog:

2020-05-13 Michael Weghorn <m.weghorn@posteo.de>

* nto-low.cc (nto_process_target::create_inferior): Pass
argv to spawnp function as char **.
---
gdbserver/nto-low.cc | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/gdbserver/nto-low.cc b/gdbserver/nto-low.cc
index 642fe9ffd2..a88ad02f64 100644
--- a/gdbserver/nto-low.cc
+++ b/gdbserver/nto-low.cc
@@ -357,7 +357,6 @@ nto_process_target::create_inferior (const char *program,
struct inheritance inherit;
pid_t pid;
sigset_t set;
- std::string str_program_args = stringify_argv (program_args);

TRACE ("%s %s\n", __func__, program);
/* Clear any pending SIGUSR1's but keep the behavior the same. */
@@ -371,7 +370,7 @@ nto_process_target::create_inferior (const char *program,
inherit.flags |= SPAWN_SETGROUP | SPAWN_HOLD;
inherit.pgroup = SPAWN_NEWPGROUP;
pid = spawnp (program, 0, NULL, &inherit,
- (char *) str_program_args.c_str (), 0);
+ program_args.data (), 0);
sigprocmask (SIG_BLOCK, &set, NULL);

if (pid == -1)
--
2.26.2