[PATCH] posix: fix system when a child cannot be created [BZ #32450]

[PATCH] posix: fix system when a child cannot be created [BZ #32450]

POSIX states that "if a child process cannot be created, or if the
termination status for the command language interpreter cannot be
obtained, system() shall return -1 and set errno to indicate the error."

In the glibc implementation it could happen when posix_spawn fails,
which happens when the underlying fork, vfork, or clone call fails. They
could fail with EAGAIN and ENOMEM.

Resolves: BZ #32450
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
Gbp-Pq: Topic any
Gbp-Pq: Name git-posix-fix-system-when-a-child-cannot-be-created-BZ-3.patch