From b9401b8f6c29c2fc13eb22617df11f4ece91d688 Mon Sep 17 00:00:00 2001 From: Marcus Brinkmann Date: Fri, 18 Nov 2005 11:18:01 +0000 Subject: [PATCH] 2005-11-18 Marcus Brinkmann * w32-glib-io.c: Rewrote the file handle code. We don't create system fds for every handle (doesn't work for inherited handles), but we create pseudo fds in a private namespace that designate a handle and potentially a giochannel. --- gpgme/ChangeLog | 7 ++ gpgme/w32-glib-io.c | 218 ++++++++++++++++++++++++++++++-------------- 2 files changed, 155 insertions(+), 70 deletions(-) diff --git a/gpgme/ChangeLog b/gpgme/ChangeLog index 4414c82..6f751f3 100644 --- a/gpgme/ChangeLog +++ b/gpgme/ChangeLog @@ -1,3 +1,10 @@ +2005-11-18 Marcus Brinkmann + + * w32-glib-io.c: Rewrote the file handle code. We don't create + system fds for every handle (doesn't work for inherited handles), + but we create pseudo fds in a private namespace that designate a + handle and potentially a giochannel. + 2005-11-17 Marcus Brinkmann * w32-glib-io.c: New file. diff --git a/gpgme/w32-glib-io.c b/gpgme/w32-glib-io.c index 0867b04..8e7abea 100644 --- a/gpgme/w32-glib-io.c +++ b/gpgme/w32-glib-io.c @@ -43,29 +43,114 @@ #include -static GIOChannel *giochannel_table[256]; +/* This file is an ugly hack to get GPGME working with glib on Windows + targets. On Windows, you can not select() on file descriptors. + The only way to check if there is something to read is to read + something. This means that GPGME can not let glib check for data + without letting glib also handle the data on Windows targets. + + The ugly consequence is that we need to work on GIOChannels in + GPGME, creating a glib dependency. Also, we need to export an + interface for the application to get at GPGME's GIOChannel. There + is no good way to abstract all this with callbacks, because the + whole thing is also interconnected with the creation of pipes and + child processes. + + The following rules apply only to this I/O backend: + + * All "file descriptors" that GPGME gives to the application are + not system file descriptors, but some internal number maintained by + GPGME. I call them "Something like a file descriptor" (SLAFD). + It's an ugly name for an ugly thing. + + * The application can use this "file descriptor" for exactly one + thing: To call gpgme_get_giochannel on it. This returns the + GIOChannel that the application can actually use. The channel can + then be integrated in the event loop. + + * ALL operations must use the user defined event loop. GPGME can + not anymore provide its own event loop. This is mostly a sanity + requirement: Although we have in theory all information we need to + make the GPGME W32 code for select still work, it would be a big + complication and require changes throughout GPGME. + + Eventually, we probably have to bite the bullet and make some + really nice callback interfaces to let the user control all this at + a per-context level. */ + + +/* Something like a file descriptor. We can not use "real" file + descriptors, because for some reason we can't create them from + osfhandles to be inherited. Argh! */ +static struct +{ + /* This is non-null if the entry is used. */ + HANDLE osfhandle; + + /* This is non-null if there is a GIOChannel for this handle. Only + for our end of the pipe. */ + GIOChannel *channel; +} slafd_table[256]; + +#define MAX_SLAFD ((int) DIM (slafd_table)) + +static int +create_slafd (HANDLE handle, int create_channel) +{ + int slafd; + + for (slafd = 0; slafd < MAX_SLAFD; slafd++) + if (slafd_table[slafd].osfhandle == NULL) + break; + + if (slafd == MAX_SLAFD) + return -1; + + if (create_channel) + { + /* FIXME: Do we need to specify the direction, too? */ + // int fd = _open_osfhandle ((long) handle, 0); + // DEBUG2("opened handle %p to %i\n", handle, fd); + slafd_table[slafd].channel = g_io_channel_unix_new ((int)handle); + if (!slafd_table[slafd].channel) + { + errno = EIO; /* XXX */ + return -1; + } + } + else + slafd_table[slafd].channel = NULL; + + slafd_table[slafd].osfhandle = handle; + return slafd; +} -static HANDLE handle_table[256]; -#define fd_to_handle(x) handle_table[x] static GIOChannel * -find_channel (int fd, int create) +find_channel (int fd) { - if (fd < 0 || fd > (int) DIM (giochannel_table)) + if (fd < 0 || fd >= MAX_SLAFD) return NULL; - if (giochannel_table[fd] == NULL && create) - giochannel_table[fd] = g_io_channel_unix_new (fd); + return slafd_table[fd].channel; +} + + +static HANDLE +find_handle (int fd) +{ + if (fd < 0 || fd >= MAX_SLAFD) + return NULL; - return giochannel_table[fd]; + return slafd_table[fd].osfhandle; } -/* Look up the giochannel for file descriptor FD. */ +/* Look up the giochannel for "file descriptor" FD. */ GIOChannel * gpgme_get_giochannel (int fd) { - return find_channel (fd, 0); + return find_channel (fd); } @@ -79,7 +164,7 @@ static struct { void (*handler) (int,void*); void *value; -} notify_table[256]; +} notify_table[MAX_SLAFD]; int _gpgme_io_read (int fd, void *buffer, size_t count) @@ -91,20 +176,31 @@ _gpgme_io_read (int fd, void *buffer, size_t count) DEBUG2 ("fd %d: about to read %d bytes\n", fd, (int) count); - chan = find_channel (fd, 0); + chan = find_channel (fd); if (!chan) { DEBUG1 ("fd %d: no channel registered\n", fd); errno = EINVAL; return -1; } + DEBUG2 ("fd %d: channel %p\n", fd, chan); + + { + GError *err = NULL; + status = g_io_channel_read_chars (chan, (gchar *) buffer, + count, &nread, &err); + if (err) + { + DEBUG3 ("fd %d: status %i, err %s\n", fd, status, err->message); + g_error_free (err); + } + } - status = g_io_channel_read_chars (chan, (gchar *) buffer, - count, &nread, NULL); if (status == G_IO_STATUS_EOF) nread = 0; else if (status != G_IO_STATUS_NORMAL) { + DEBUG2 ("fd %d: status %d\n", fd, status); nread = -1; saved_errno = EIO; } @@ -129,7 +225,7 @@ _gpgme_io_write (int fd, const void *buffer, size_t count) DEBUG2 ("fd %d: about to write %d bytes\n", fd, (int) count); _gpgme_debug (2, "fd %d: write `%.*s'\n", fd, (int) count, buffer); - chan = find_channel (fd, 0); + chan = find_channel (fd); if (!chan) { DEBUG1 ("fd %d: no channel registered\n", fd); @@ -159,6 +255,8 @@ _gpgme_io_pipe ( int filedes[2], int inherit_idx ) memset (&sec_attr, 0, sizeof sec_attr ); sec_attr.nLength = sizeof sec_attr; sec_attr.bInheritHandle = FALSE; + + DEBUG1("INHERIT: %i\n", inherit_idx); #define PIPEBUF_SIZE 4096 if (!CreatePipe ( &r, &w, &sec_attr, PIPEBUF_SIZE)) @@ -190,54 +288,25 @@ _gpgme_io_pipe ( int filedes[2], int inherit_idx ) CloseHandle (w); w = h; } - filedes[0] = _open_osfhandle ((long) r, 0 ); + filedes[0] = create_slafd (r, inherit_idx == 1); if (filedes[0] == -1) { - DEBUG1 ("_open_osfhandle failed: ec=%d\n", errno); + DEBUG1 ("create_slafd failed: ec=%d\n", errno); CloseHandle (r); CloseHandle (w); return -1; } - filedes[1] = _open_osfhandle ((long) w, 0 ); + + filedes[1] = create_slafd (w, inherit_idx == 0); + if (filedes[1] == -1) { - DEBUG1 ("_open_osfhandle failed: ec=%d\n", errno); + DEBUG1 ("create_slafd failed: ec=%d\n", errno); _gpgme_io_close (filedes[0]); CloseHandle (r); CloseHandle (w); return -1; } - /* The fd that is not inherited will be used locally. Create a - channel for it. */ - if (inherit_idx == 0) - { - if (!find_channel (filedes[1], 1)) - { - DEBUG1 ("channel creation failed for %d\n", filedes[1]); - _gpgme_io_close (filedes[0]); - _gpgme_io_close (filedes[1]); - CloseHandle (r); - CloseHandle (w); - return -1; - } - } - else - { - if (!find_channel (filedes[0], 1)) - { - DEBUG1 ("channel creation failed for %d\n", filedes[1]); - _gpgme_io_close (filedes[0]); - _gpgme_io_close (filedes[1]); - CloseHandle (r); - CloseHandle (w); - return -1; - } - } - - /* Remember the handles for later. */ - handle_table[filedes[0]] = r; - handle_table[filedes[1]] = w; - DEBUG5 ("CreatePipe %p %p %d %d inherit=%d\n", r, w, filedes[0], filedes[1], inherit_idx ); return 0; @@ -249,31 +318,38 @@ _gpgme_io_close (int fd) { GIOChannel *chan; - if (fd == -1) - return -1; + if (fd < 0 || fd >= MAX_SLAFD) + { + errno = EBADF; + return -1; + } /* First call the notify handler. */ DEBUG1 ("closing fd %d", fd); - if (fd >= 0 && fd < (int) DIM (notify_table)) + if (notify_table[fd].handler) { - if (notify_table[fd].handler) - { - notify_table[fd].handler (fd, notify_table[fd].value); - notify_table[fd].handler = NULL; - notify_table[fd].value = NULL; - } + notify_table[fd].handler (fd, notify_table[fd].value); + notify_table[fd].handler = NULL; + notify_table[fd].value = NULL; } + /* Then do the close. */ - chan = find_channel (fd, 0); + chan = slafd_table[fd].channel; if (chan) { g_io_channel_shutdown (chan, 1, NULL); g_io_channel_unref (chan); - giochannel_table[fd] = NULL; - return 0; } - else - return close (fd); + + if (!CloseHandle (slafd_table[fd].osfhandle)) + { + DEBUG2 ("CloseHandle for fd %d failed: ec=%d\n", + fd, (int)GetLastError ()); + } + + slafd_table[fd].osfhandle = NULL; + + return 0; } @@ -297,7 +373,7 @@ _gpgme_io_set_nonblocking (int fd) GIOChannel *chan; GIOStatus status; - chan = find_channel (fd, 0); + chan = find_channel (fd); if (!chan) { errno = EIO; @@ -395,16 +471,18 @@ _gpgme_io_spawn ( const char *path, char **argv, for (i=0; fd_child_list[i].fd != -1; i++ ) { if (fd_child_list[i].dup_to == 0 ) { - si.hStdInput = fd_to_handle (fd_child_list[i].fd); - DEBUG1 ("using %d for stdin", fd_child_list[i].fd ); + si.hStdInput = find_handle (fd_child_list[i].fd); + DEBUG2 ("using %d (%p) for stdin", fd_child_list[i].fd, + find_handle (fd_child_list[i].fd)); duped_stdin=1; } else if (fd_child_list[i].dup_to == 1 ) { - si.hStdOutput = fd_to_handle (fd_child_list[i].fd); - DEBUG1 ("using %d for stdout", fd_child_list[i].fd ); + si.hStdOutput = find_handle (fd_child_list[i].fd); + DEBUG2 ("using %d (%p) for stdout", fd_child_list[i].fd, + find_handle (fd_child_list[i].fd)); } else if (fd_child_list[i].dup_to == 2 ) { - si.hStdError = fd_to_handle (fd_child_list[i].fd); + si.hStdError = find_handle (fd_child_list[i].fd); DEBUG1 ("using %d for stderr", fd_child_list[i].fd ); duped_stderr = 1; } -- 2.26.2