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From: Corinna Vinschen <corinna@sourceware.org> To: cygwin-cvs@sourceware.org Subject: [newlib-cygwin/main] Cygwin: open_shared: don't reuse shared_locations parameter as output Date: Tue, 17 Jan 2023 19:15:06 +0000 (GMT) [thread overview] Message-ID: <20230117191506.5DBAB3858410@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=93508e5bb841138911ed3dee3c92cc18be43d9ca commit 93508e5bb841138911ed3dee3c92cc18be43d9ca Author: Corinna Vinschen <corinna@vinschen.de> AuthorDate: Mon Jan 16 22:25:42 2023 +0100 Commit: Corinna Vinschen <corinna@vinschen.de> CommitDate: Tue Jan 17 16:32:14 2023 +0100 Cygwin: open_shared: don't reuse shared_locations parameter as output For ages, open_shared uses the shared_locations parameter as output to indicate if the mapping for a shared region has been created or just opened. Split this into two parameters. Use the shared_locations parameter as input only, return the creation state of the mapping in a bool reference parameter. Signed-off-by: Corinna Vinschen <corinna@vinschen.de> Diff: --- winsup/cygwin/fhandler/console.cc | 7 +++--- winsup/cygwin/local_includes/shared_info.h | 8 +++--- winsup/cygwin/mm/shared.cc | 39 ++++++++++++++++-------------- winsup/cygwin/pinfo.cc | 6 ++--- 4 files changed, 31 insertions(+), 29 deletions(-) diff --git a/winsup/cygwin/fhandler/console.cc b/winsup/cygwin/fhandler/console.cc index ee392fda25dc..68ab43d81ea1 100644 --- a/winsup/cygwin/fhandler/console.cc +++ b/winsup/cygwin/fhandler/console.cc @@ -211,15 +211,14 @@ beep () } fhandler_console::console_state * -fhandler_console::open_shared_console (HWND hw, HANDLE& h, bool& create) +fhandler_console::open_shared_console (HWND hw, HANDLE& h, bool& created) { wchar_t namebuf[(sizeof "XXXXXXXXXXXXXXXXXX-consNNNNNNNNNN")]; __small_swprintf (namebuf, L"%S-cons%p", &cygheap->installation_key, hw); - shared_locations m = create ? SH_SHARED_CONSOLE : SH_JUSTOPEN; + shared_locations m = created ? SH_SHARED_CONSOLE : SH_JUSTOPEN; console_state *res = (console_state *) - open_shared (namebuf, 0, h, sizeof (console_state), &m); - create = m != SH_JUSTOPEN; + open_shared (namebuf, 0, h, sizeof (console_state), m, created); return res; } diff --git a/winsup/cygwin/local_includes/shared_info.h b/winsup/cygwin/local_includes/shared_info.h index 6c53ec0b8b0f..cbe55a27887b 100644 --- a/winsup/cygwin/local_includes/shared_info.h +++ b/winsup/cygwin/local_includes/shared_info.h @@ -89,9 +89,9 @@ HANDLE get_session_parent_dir (); char *shared_name (char *, const char *, int); WCHAR *shared_name (WCHAR *, const WCHAR *, int); void *open_shared (const WCHAR *, int, HANDLE&, DWORD, - shared_locations, PSECURITY_ATTRIBUTES = &sec_all, - DWORD = FILE_MAP_READ | FILE_MAP_WRITE); + shared_locations, PSECURITY_ATTRIBUTES = &sec_all, + DWORD = FILE_MAP_READ | FILE_MAP_WRITE); void *open_shared (const WCHAR *, int, HANDLE&, DWORD, - shared_locations *, PSECURITY_ATTRIBUTES = &sec_all, - DWORD = FILE_MAP_READ | FILE_MAP_WRITE); + shared_locations, bool &, PSECURITY_ATTRIBUTES = &sec_all, + DWORD = FILE_MAP_READ | FILE_MAP_WRITE); extern void user_shared_create (bool reinit); diff --git a/winsup/cygwin/mm/shared.cc b/winsup/cygwin/mm/shared.cc index 893b20d289b4..351d314af01b 100644 --- a/winsup/cygwin/mm/shared.cc +++ b/winsup/cygwin/mm/shared.cc @@ -127,54 +127,57 @@ void * open_shared (const WCHAR *name, int n, HANDLE& shared_h, DWORD size, shared_locations m, PSECURITY_ATTRIBUTES psa, DWORD access) { - return open_shared (name, n, shared_h, size, &m, psa, access); + bool created_dummy; + return open_shared (name, n, shared_h, size, m, created_dummy, psa, access); } void * open_shared (const WCHAR *name, int n, HANDLE& shared_h, DWORD size, - shared_locations *m, PSECURITY_ATTRIBUTES psa, DWORD access) + shared_locations m, bool &created, PSECURITY_ATTRIBUTES psa, + DWORD access) { + WCHAR map_buf[MAX_PATH]; + WCHAR *mapname = NULL; void *shared; - void *addr; - if (*m == SH_JUSTCREATE || *m == SH_JUSTOPEN) + + if (m == SH_JUSTCREATE || m == SH_JUSTOPEN) addr = NULL; else - addr = (void *) region_address[*m]; + addr = (void *) region_address[m]; - WCHAR map_buf[MAX_PATH]; - WCHAR *mapname = NULL; - - if (shared_h) - *m = SH_JUSTOPEN; - else + created = false; + if (!shared_h) { if (name) mapname = shared_name (map_buf, name, n); - if (*m == SH_JUSTOPEN) - shared_h = OpenFileMappingW (access, FALSE, mapname); + if (m == SH_JUSTOPEN) + shared_h = OpenFileMappingW (FILE_MAP_READ | FILE_MAP_WRITE, FALSE, + mapname); else { + created = true; shared_h = CreateFileMappingW (INVALID_HANDLE_VALUE, psa, PAGE_READWRITE, 0, size, mapname); if (GetLastError () == ERROR_ALREADY_EXISTS) - *m = SH_JUSTOPEN; + created = false; } if (shared_h) /* ok! */; - else if (*m != SH_JUSTOPEN) + else if (m != SH_JUSTOPEN) api_fatal ("CreateFileMapping %W, %E. Terminating.", mapname); else return NULL; } - shared = (shared_info *) MapViewOfFileEx (shared_h, access, 0, 0, 0, addr); + shared = MapViewOfFileEx (shared_h, FILE_MAP_READ | FILE_MAP_WRITE, + 0, 0, 0, addr); if (!shared) api_fatal ("MapViewOfFileEx '%W'(%p), %E. Terminating.", mapname, shared_h); - debug_printf ("name %W, n %d, shared %p (wanted %p), h %p, *m %d", - mapname, n, shared, addr, shared_h, *m); + debug_printf ("name %W, n %d, shared %p (wanted %p), h %p, m %d", + mapname, n, shared, addr, shared_h, m); return shared; } diff --git a/winsup/cygwin/pinfo.cc b/winsup/cygwin/pinfo.cc index fc618b9b8dd1..c05cf2662cd7 100644 --- a/winsup/cygwin/pinfo.cc +++ b/winsup/cygwin/pinfo.cc @@ -387,8 +387,10 @@ pinfo::init (pid_t n, DWORD flag, HANDLE h0) for (int i = 0; i < 20; i++) { + bool created; + procinfo = (_pinfo *) open_shared (L"cygpid", n, h0, sizeof (_pinfo), - &shloc, sec_attribs, access); + shloc, created, sec_attribs, access); if (!h0) { if (createit) @@ -409,8 +411,6 @@ pinfo::init (pid_t n, DWORD flag, HANDLE h0) continue; } - bool created = shloc != SH_JUSTOPEN; - /* Just fetching info for ps or /proc, don't do anything rash. */ if (!created && !(flag & PID_NEW) && !procinfo->ppid && (flag & PID_PROCINFO))
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