35 # include <sys/linux-syscalls.h>
41 /* If this is ever expanded to non-Linux platforms, verify what calls are
53 #  define dirfd(dirp) ((dirp)->dd_fd)
70 #define POSIX_CALL(call)   do { if ((call) == -1) goto error; } while (0)
72 static struct PyModuleDef _posixsubprocessmodule;
74 /* Convert ASCII to a positive int, no libc call. no overflow. -1 on error. */
75 static int
80         num = num * 10 + (*name - '0');  in _pos_int_from_ascii()
84         return -1;  /* Non digit found, not a number. */  in _pos_int_from_ascii()
90 /* When /dev/fd isn't mounted it is often a static directory populated
96 static int
106         return 0;  /* / == /dev == /dev/fd means it is static. #fail */  in _is_fdescfs_mounted_on_dev_fd()
113 static int
117     long prev_fd = -1;  in _sanity_check_python_fd_sequence()
136 static int
141     Py_ssize_t search_max = PyTuple_GET_SIZE(fd_sequence) - 1;  in _is_fd_in_sorted_fd_sequence()
152             search_max = middle - 1;  in _is_fd_in_sorted_fd_sequence()
157 static int
175             return -1;  in make_inheritable()
184 static long
196      * safe.  TODO - Someone should audit OpenBSD to make sure. */  in safe_get_max_fd()
202     if (local_max_fd == -1)  in safe_get_max_fd()
217 static void
230         _Py_closerange(start_fd, keep_fd - 1);  in _close_fds_by_brute_force()
251    char           d_name[256];  /* Filename (null-terminated) */
269 static void
275     if (fd_dir_fd == -1) {  in _close_open_fds_safe()
290             for (offset = 0; offset < bytes; offset += entry->d_reclen) {  in _close_open_fds_safe()
293                 if ((fd = _pos_int_from_ascii(entry->d_name)) < 0)  in _close_open_fds_safe()
321  *   http://womble.decadent.org.uk/readdir_r-advisory.html
323 static void
353         int fd_used_by_opendir = start_fd - 1;  in _close_open_fds_maybe_unsafe()
358             if ((fd = _pos_int_from_ascii(dir_entry->d_name)) < 0)  in _close_open_fds_maybe_unsafe()
384 static void
404         if (sigaction(sig, NULL, &sa) == -1) {  in reset_signal_handlers()
427  * All of the code in this function must only use async-signal-safe functions,
437  * async-signal-safe functions vfork-unsafe. In particular, on Linux,
439  * they have to interact with the library-level thread list and send
440  * library-internal signals to implement per-process credentials semantics
444  * See bpo-35823 for further discussion and references.
447  * behavior since resource limits were per-thread attributes before
451  * If vfork-unsafe functionality is desired after vfork(), consider using
454 _Py_NO_INLINE static void
483     if (p2cwrite != -1)  in child_exec()
485     if (c2pread != -1)  in child_exec()
487     if (errread != -1)  in child_exec()
510        would be a no-op (issue #10806). */  in child_exec()
515     else if (p2cread != -1)  in child_exec()
522     else if (c2pwrite != -1)  in child_exec()
529     else if (errwrite != -1)  in child_exec()
533      * _close_open_fds takes care when it is not already non-inheritable. */  in child_exec()
576         /* This is where the user has asked us to deadlock their program. */  in child_exec()
588         /* Py_DECREF(result); - We're about to exec so why bother? */  in child_exec()
593         /* TODO HP-UX could use pstat_getproc() if anyone cares about it. */  in child_exec()
627             *--cur = Py_hexdigits[saved_errno % 16];  in child_exec()
630         _Py_write_noraise(errpipe_write, cur, hex_errno + sizeof(hex_errno) - cur);  in child_exec()
650  * child_exec() should not be inlined to avoid spurious -Wclobber warnings from
651  * GCC (see bpo-35823).
653 _Py_NO_INLINE static pid_t
701          * This call may not be async-signal-safe but neither is calling  in do_fork_exec()
702          * back into Python.  The user asked us to use hope as a strategy  in do_fork_exec()
719 static PyObject *
738     pid_t pid = -1;  in subprocess_fork_exec()
775     if (config->_isolated_interpreter) {  in subprocess_fork_exec()
928     /* NOTE: When old_sigmask is non-NULL, do_fork_exec() may use vfork(). */  in subprocess_fork_exec()
941          * might send such a signal to be vfork-unsafe and do not call it in  in subprocess_fork_exec()
962     if (pid == -1) {  in subprocess_fork_exec()
973          * such as QEMU user-mode emulation, the parent won't be blocked,  in subprocess_fork_exec()
1013     return pid == -1 ? NULL : PyLong_FromPid(pid);  in subprocess_fork_exec()
1050 static PyMethodDef module_methods[] = {
1055 static PyModuleDef_Slot _posixsubprocess_slots[] = {
1059 static struct PyModuleDef _posixsubprocessmodule = {