Pablo Galindo Salgado <[email protected]> added the comment:
The documentation says:
The child process is created using vfork(2) instead of fork(2) when
either of the following is true:
* the spawn-flags element of the attributes object pointed to by
attrp contains the GNU-specific flag POSIX_SPAWN_USEVFORK; or
* file_actions is NULL and the spawn-flags element of the attributes
object pointed to by attrp does not contain
POSIX_SPAWN_SETSIGMASK, POSIX_SPAWN_SETSIGDEF,
POSIX_SPAWN_SETSCHEDPARAM, POSIX_SPAWN_SETSCHEDULER,
POSIX_SPAWN_SETPGROUP, or POSIX_SPAWN_RESETIDS.
So using the flag is necessary if you want to force the use of vfork when
passing any of the flags specified in the second point.
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<https://bugs.python.org/issue34663>
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