109 lines
2.0 KiB
C++
109 lines
2.0 KiB
C++
/* fcntl.cc: fcntl syscall
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Copyright 1996, 1997, 1998 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 <fcntl.h>
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#include <stdarg.h>
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#include <errno.h>
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#include <unistd.h>
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#include "dtable.h"
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#include "cygerrno.h"
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extern "C"
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int
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_fcntl (int fd, int cmd,...)
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{
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va_list args;
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int arg = 0;
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int res;
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SetResourceLock(LOCK_FD_LIST,WRITE_LOCK|READ_LOCK, "_fcntl");
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if (fdtab.not_open (fd))
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{
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set_errno (EBADF);
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res = -1;
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goto done;
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}
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switch (cmd)
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{
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case F_DUPFD:
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va_start (args, cmd);
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arg = va_arg (args,int);
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va_end (args);
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res = dup2 (fd, fdtab.find_unused_handle (arg));
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goto done;
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case F_GETFD:
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res = fdtab[fd]->get_close_on_exec () ? FD_CLOEXEC : 0;
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goto done;
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case F_SETFD:
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va_start (args, cmd);
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arg = va_arg (args, int);
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va_end (args);
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fdtab[fd]->set_close_on_exec (arg);
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res = 0;
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goto done;
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case F_GETFL:
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{
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res = fdtab[fd]->get_flags ();
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goto done;
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}
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case F_SETFL:
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{
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int temp = 0;
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va_start (args, cmd);
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arg = va_arg (args, int);
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va_end (args);
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if (arg & O_RDONLY)
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temp |= GENERIC_READ;
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if (arg & O_WRONLY)
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temp |= GENERIC_WRITE;
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syscall_printf ("fcntl (%d, F_SETFL, %d)", arg);
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fdtab[fd]->set_access (temp);
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fdtab[fd]->set_flags (arg);
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res = 0;
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goto done;
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}
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case F_GETLK:
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case F_SETLK:
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case F_SETLKW:
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{
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struct flock *fl;
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va_start (args, cmd);
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fl = va_arg (args,struct flock *);
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va_end (args);
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res = fdtab[fd]->lock (cmd, fl);
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goto done;
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}
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default:
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set_errno (EINVAL);
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res = -1;
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goto done;
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}
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set_errno (ENOSYS);
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res = -1;
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done:
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ReleaseResourceLock(LOCK_FD_LIST,WRITE_LOCK|READ_LOCK,"_fcntl");
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syscall_printf ("%d = fcntl (%d, %d, %d)", res, fd, cmd, arg);
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return res;
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}
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