/* Open a file with the specified flags (wrapper to open() function).
The file descriptor is created non-inheritable. */
int
_Py_open(const char *pathname, int flags)
{
int fd;
#ifdef MS_WINDOWS
fd = open(pathname, flags | O_NOINHERIT);
if (fd < 0)
return fd;
#else
int *atomic_flag_works;
#ifdef O_CLOEXEC
atomic_flag_works = &_Py_open_cloexec_works;
flags |= O_CLOEXEC;
#else
atomic_flag_works = NULL;
#endif
fd = open(pathname, flags);
if (fd < 0)
return fd;
if (set_inheritable(fd, 0, 0, atomic_flag_works) < 0) {
close(fd);
return -1;
}
#endif /* !MS_WINDOWS */
return fd;
}
/* Make the file descriptor non-inheritable.
Return 0 on success, set errno and return -1 on error. */
static int
make_non_inheritable(int fd)
{
return set_inheritable(fd, 0, 0, NULL);
}
/* Set the inheritable flag of the specified file descriptor.
On success: return 0, on error: raise an exception if raise is nonzero
and return -1.
If atomic_flag_works is not NULL:
* if *atomic_flag_works==-1, check if the inheritable is set on the file
descriptor: if yes, set *atomic_flag_works to 1, otherwise set to 0 and
set the inheritable flag
* if *atomic_flag_works==1: do nothing
* if *atomic_flag_works==0: set inheritable flag to False
Set atomic_flag_works to NULL if no atomic flag was used to create the
file descriptor.
atomic_flag_works can only be used to make a file descriptor
non-inheritable: atomic_flag_works must be NULL if inheritable=1. */
int
_Py_set_inheritable(int fd, int inheritable, int *atomic_flag_works)
{
return set_inheritable(fd, inheritable, 1, atomic_flag_works);
}
/* Same as _Py_set_inheritable() but on error, set errno and
don't raise an exception.
This function is async-signal-safe. */
int
_Py_set_inheritable_async_safe(int fd, int inheritable, int *atomic_flag_works)
{
return set_inheritable(fd, inheritable, 0, atomic_flag_works);
}
