When the new flag is used, close_range will set the close-on-exec bit for the file descriptors instead of close()-ing them. It is useful for e.g. container runtimes that want to minimize the number of syscalls used after a seccomp profile is installed but want to keep some fds open until the container process is executed. v1->v2: * move close_range(..., CLOSE_RANGE_CLOEXEC) implementation to a separate function. * use bitmap_set() to set the close-on-exec bits in the bitmap. * add test with rlimit(RLIMIT_NOFILE) in place. * use "cur_max" that is already used by close_range(..., 0). Giuseppe Scrivano (2): fs, close_range: add flag CLOSE_RANGE_CLOEXEC selftests: add tests for CLOSE_RANGE_CLOEXEC fs/file.c | 44 ++++++++--- include/uapi/linux/close_range.h | 3 + .../testing/selftests/core/close_range_test.c | 74 +++++++++++++++++++ 3 files changed, 111 insertions(+), 10 deletions(-) -- 2.26.2
