100 lines
2.4 KiB
C++
100 lines
2.4 KiB
C++
/* pipe.cc: pipe for Cygwin.
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Copyright 1996, 1998, 1999, 2000 Cygnus Solutions.
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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 "fhandler.h"
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#include "dtable.h"
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#include "thread.h"
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#include "security.h"
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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, fdw;
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SECURITY_ATTRIBUTES *sa = (mode & O_NOINHERIT) ? &sec_none_nih : &sec_none;
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if ((fdr = fdtab.find_unused_handle ()) < 0)
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set_errno (ENMFILE);
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else if ((fdw = 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_base *fhr = fdtab.build_fhandler (fdr, FH_PIPER, "/dev/piper");
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fhandler_base *fhw = 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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debug_printf ("0 = pipe (%p) (%d:%p, %d:%p)", fildes,
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fdr, fhr->get_handle (), fdw, fhw->get_handle ());
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ReleaseResourceLock(LOCK_FD_LIST,WRITE_LOCK|READ_LOCK," make_pipe");
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return 0;
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}
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syscall_printf ("-1 = pipe (%p)", fildes);
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ReleaseResourceLock(LOCK_FD_LIST,WRITE_LOCK|READ_LOCK," make_pipe");
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return -1;
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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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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, 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 fdtab.dup2 (oldfd, newfd);
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}
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