5e733918c0
interrupted. * fhandler.cc: Move pipe methods to pipe.cc. * fhandler.h (fhandler_pipe): Add new methods. * fork.cc (sync_with_parent): Make error messages more informative. * pipe.cc (fhandler_pipe::fhandler_pipe): Move here from fhandler.cc. (fhandler_pipe::lseek): Ditto. (fhandler_pipe::set_close_on_exec): New method. (fhandler_pipe::read): Ditto. (fhandler_pipe::close): Ditto. (fhandler_pipe::dup): Ditto. (make_pipe): Create the guard mutex on the read side of the pipe. * select.cc (peek_pipe): Use guard_mutex to discover if we have the right to read on this pipe. (fhandler_pipe::readh_for_read): Pass the read pipe guard mutex to peek_pipe. * syscalls.cc (_read): Always detect signal catchers, for now. * debug.cc (makethread): Eliminate hack to make thread inheritable. * sigproc.cc (subproc_init): Don't use hack to make thread inheritable.
153 lines
3.5 KiB
C++
153 lines
3.5 KiB
C++
/* pipe.cc: pipe for Cygwin.
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Copyright 1996, 1998, 1999, 2000, 2001 Red Hat, Inc.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include "winsup.h"
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#include <unistd.h>
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#include <sys/fcntl.h>
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#include <errno.h>
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#include "cygerrno.h"
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#include "security.h"
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#include "fhandler.h"
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#include "dtable.h"
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#include "cygheap.h"
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#include "thread.h"
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fhandler_pipe::fhandler_pipe (const char *name, DWORD devtype) :
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fhandler_base (devtype, name), guard (0)
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{
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set_cb (sizeof *this);
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}
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off_t
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fhandler_pipe::lseek (off_t offset, int whence)
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{
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debug_printf ("(%d, %d)", offset, whence);
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set_errno (ESPIPE);
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return -1;
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}
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void
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fhandler_pipe::set_close_on_exec (int val)
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{
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this->fhandler_base::set_close_on_exec (val);
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set_inheritance (guard, val);
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}
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int
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fhandler_pipe::read (void *in_ptr, size_t in_len)
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{
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int res = this->fhandler_base::read (in_ptr, in_len);
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ReleaseMutex (guard);
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return res;
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}
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int fhandler_pipe::close ()
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{
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int res = this->fhandler_base::close ();
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if (guard)
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CloseHandle (guard);
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return res;
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}
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int
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fhandler_pipe::dup (fhandler_base *child)
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{
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int res = this->fhandler_base::dup (child);
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if (res)
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return res;
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fhandler_pipe *ftp = (fhandler_pipe *) child;
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if (guard == NULL)
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ftp->guard = NULL;
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else if (!DuplicateHandle (hMainProc, guard, hMainProc, &ftp->guard, 0, 1,
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DUPLICATE_SAME_ACCESS))
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return -1;
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return 0;
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}
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static int
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make_pipe (int fildes[2], unsigned int psize, int mode)
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{
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SetResourceLock (LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "make_pipe");
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HANDLE r, w;
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int fdr = -1, fdw = -1;
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SECURITY_ATTRIBUTES *sa = (mode & O_NOINHERIT) ? &sec_none_nih : &sec_none;
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int res = -1;
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if ((fdr = cygheap->fdtab.find_unused_handle ()) < 0)
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set_errno (ENMFILE);
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else if ((fdw = cygheap->fdtab.find_unused_handle (fdr + 1)) < 0)
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set_errno (ENMFILE);
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else if (!CreatePipe (&r, &w, sa, psize))
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__seterrno ();
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else
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{
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fhandler_pipe *fhr = (fhandler_pipe *) cygheap->fdtab.build_fhandler (fdr, FH_PIPER, "/dev/piper");
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fhandler_pipe *fhw = (fhandler_pipe *) cygheap->fdtab.build_fhandler (fdw, FH_PIPEW, "/dev/pipew");
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int binmode = mode & O_TEXT ? 0 : 1;
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fhr->init (r, GENERIC_READ, binmode);
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fhw->init (w, GENERIC_WRITE, binmode);
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if (mode & O_NOINHERIT)
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{
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fhr->set_close_on_exec_flag (1);
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fhw->set_close_on_exec_flag (1);
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}
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fildes[0] = fdr;
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fildes[1] = fdw;
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res = 0;
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fhr->create_guard (sa);
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}
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syscall_printf ("%d = make_pipe ([%d, %d], %d, %p)", res, fdr, fdw, psize, mode);
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ReleaseResourceLock(LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "make_pipe");
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return res;
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}
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extern "C" int
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pipe (int filedes[2])
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{
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extern DWORD binmode;
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return make_pipe (filedes, 16384, (!binmode || binmode == O_BINARY) ? O_BINARY : O_TEXT);
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}
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extern "C" int
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_pipe (int filedes[2], unsigned int psize, int mode)
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{
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int res = make_pipe (filedes, psize, mode);
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/* This type of pipe is not interruptible so set the appropriate flag. */
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if (!res)
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cygheap->fdtab[filedes[0]]->set_r_no_interrupt (1);
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return res;
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}
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int
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dup (int fd)
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{
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int res;
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SetResourceLock (LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "dup");
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res = dup2 (fd, cygheap->fdtab.find_unused_handle ());
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ReleaseResourceLock(LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "dup");
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return res;
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}
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int
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dup2 (int oldfd, int newfd)
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{
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return cygheap->fdtab.dup2 (oldfd, newfd);
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}
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