diff options
Diffstat (limited to 'lib/windows-spawn.h')
| -rw-r--r-- | lib/windows-spawn.h | 62 |
1 files changed, 45 insertions, 17 deletions
diff --git a/lib/windows-spawn.h b/lib/windows-spawn.h index 0be407bf9..42c5af771 100644 --- a/lib/windows-spawn.h +++ b/lib/windows-spawn.h @@ -1,5 +1,5 @@ /* Auxiliary functions for the creation of subprocesses. Native Windows API. - Copyright (C) 2001, 2003-2022 Free Software Foundation, Inc. + Copyright (C) 2001, 2003-2023 Free Software Foundation, Inc. Written by Bruno Haible <bruno@clisp.org>, 2003. This file is free software: you can redistribute it and/or modify @@ -18,7 +18,6 @@ #ifndef _WINDOWS_SPAWN_H #define _WINDOWS_SPAWN_H -#include <stdbool.h> #include <stdint.h> #include <stdlib.h> @@ -85,10 +84,43 @@ extern char * compose_envblock (const char * const *envp) _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC_FREE; -/* This struct keeps track of which handles to pass to a subprocess, and with - which flags. All of the handles here are inheritable. +/* An inheritable handle with some additional information. */ +struct IHANDLE +{ + /* Either INVALID_HANDLE_VALUE or an inheritable handle. */ + HANDLE handle; + /* Only relevant if handle != INVALID_HANDLE_VALUE. + It is a bit mask consisting of: + - 32 for O_APPEND. + - KEEP_OPEN_IN_CHILD if the handle is scheduled to be preserved in the + child process. + - KEEP_OPEN_IN_PARENT if the handle is shared with (and needs to be kept + open in) the parent process. + - DELAYED_DUP2_OLDFD if there is a delayed dup2 (oldfd, newfd) and + this IHANDLE is at position oldfd. + - DELAYED_DUP2_NEWFD if there is a delayed dup2 (oldfd, newfd) and + this IHANDLE is at position newfd. + Note that DELAYED_DUP2_OLDFD and DELAYED_DUP2_NEWFD cannot be set in the + same IHANDLE. */ + unsigned short flags; + #define KEEP_OPEN_IN_CHILD 0x100 + #define KEEP_OPEN_IN_PARENT 0x200 + #define DELAYED_DUP2_OLDFD 0x400 + #define DELAYED_DUP2_NEWFD 0x800 + /* Only relevant if handle != INVALID_HANDLE_VALUE and flags contains + either DELAYED_DUP2_OLDFD or DELAYED_DUP2_NEWFD. + It is the other fd of the delayed dup2 (oldfd, newfd), i.e. + - for DELAYED_DUP2_OLDFD, the newfd, + - for DELAYED_DUP2_NEWFD, the oldfd. */ + int linked_fd; +}; + +/* This struct keeps track of which handles to potentially pass to a subprocess, + and with which flags. All of the handles here are inheritable. Regarding handle inheritance, see - <https://docs.microsoft.com/en-us/windows/win32/sysinfo/handle-inheritance> */ + <https://docs.microsoft.com/en-us/windows/win32/sysinfo/handle-inheritance>. + Whether a handle is actually scheduled for being preserved in the child + process is determined by the KEEP_OPEN_IN_CHILD bit in the flags. */ struct inheritable_handles { /* The number of occupied entries in the two arrays below. @@ -96,20 +128,16 @@ struct inheritable_handles size_t count; /* The number of allocated entries in the two arrays below. */ size_t allocated; - /* handles[0..count-1] are the occupied entries. - handles[fd] is either INVALID_HANDLE_VALUE or an inheritable handle. */ - HANDLE *handles; - /* flags[0..count-1] are the occupied entries. - flags[fd] is only relevant if handles[fd] != INVALID_HANDLE_VALUE. - It is a bit mask consisting of: - - 32 for O_APPEND. - */ - unsigned char *flags; + /* ih[0..count-1] are the occupied entries. */ + struct IHANDLE *ih; }; -/* Initializes a set of inheritable handles, filling in all inheritable handles - assigned to file descriptors. - If DUPLICATE is true, the handles stored in the set are duplicates. +/* Initializes a set of inheritable handles, filling in all or part of the + file descriptors of the current process. + If DUPLICATE is true, the handles stored are those of all file descriptors, + and we use DuplicateHandle to make sure that they are all inheritable. + If DUPLICATE is false, the handles stored are only the inheritables ones; + this is a shortcut for spawnpvech(). Returns 0 upon success. In case of failure, -1 is returned, with errno set. */ extern int init_inheritable_handles (struct inheritable_handles *inh_handles, |