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375 lines
8.3 KiB
C
375 lines
8.3 KiB
C
/*
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* Copyright (c) 2000-2002, 2004 Sendmail, Inc. and its suppliers.
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* All rights reserved.
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the sendmail distribution.
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*/
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#include <sm/gen.h>
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SM_RCSID("@(#)$Id: fopen.c,v 1.62 2005/06/14 23:07:20 ca Exp $")
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#include <errno.h>
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#include <setjmp.h>
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#include <sm/time.h>
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#include <sm/heap.h>
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#include <sm/signal.h>
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#include <sm/assert.h>
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#include <sm/io.h>
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#include <sm/clock.h>
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#include "local.h"
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static void openalrm __P((int));
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static void reopenalrm __P((int));
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extern int sm_io_fclose __P((SM_FILE_T *));
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static jmp_buf OpenTimeOut, ReopenTimeOut;
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/*
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** OPENALRM -- handler when timeout activated for sm_io_open()
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**
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** Returns flow of control to where setjmp(OpenTimeOut) was set.
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**
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** Parameters:
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** sig -- unused
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**
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** Returns:
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** does not return
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**
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** Side Effects:
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** returns flow of control to setjmp(OpenTimeOut).
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**
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** NOTE: THIS CAN BE CALLED FROM A SIGNAL HANDLER. DO NOT ADD
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** ANYTHING TO THIS ROUTINE UNLESS YOU KNOW WHAT YOU ARE
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** DOING.
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*/
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/* ARGSUSED0 */
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static void
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openalrm(sig)
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int sig;
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{
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longjmp(OpenTimeOut, 1);
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}
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/*
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** REOPENALRM -- handler when timeout activated for sm_io_reopen()
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**
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** Returns flow of control to where setjmp(ReopenTimeOut) was set.
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**
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** Parameters:
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** sig -- unused
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**
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** Returns:
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** does not return
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**
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** Side Effects:
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** returns flow of control to setjmp(ReopenTimeOut).
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**
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** NOTE: THIS CAN BE CALLED FROM A SIGNAL HANDLER. DO NOT ADD
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** ANYTHING TO THIS ROUTINE UNLESS YOU KNOW WHAT YOU ARE
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** DOING.
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*/
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/* ARGSUSED0 */
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static void
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reopenalrm(sig)
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int sig;
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{
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longjmp(ReopenTimeOut, 1);
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}
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/*
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** SM_IO_OPEN -- open a file of a specific type
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**
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** Parameters:
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** type -- type of file to open
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** timeout -- time to complete the open
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** info -- info describing what is to be opened (type dependant)
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** flags -- user selected flags
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** rpool -- pointer to rpool to be used for this open
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**
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** Returns:
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** Raises exception on heap exhaustion.
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** Aborts if type is invalid.
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** Returns NULL and sets errno
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** - when the type specific open fails
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** - when open vector errors
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** - when flags not set or invalid
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** Success returns a file pointer to the opened file type.
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*/
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SM_FILE_T *
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sm_io_open(type, timeout, info, flags, rpool)
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const SM_FILE_T *type;
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int SM_NONVOLATILE timeout; /* this is not the file type timeout */
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const void *info;
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int flags;
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const void *rpool;
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{
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register SM_FILE_T *fp;
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int ioflags;
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SM_EVENT *evt = NULL;
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ioflags = sm_flags(flags);
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if (ioflags == 0)
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{
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/* must give some indication/intent */
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errno = EINVAL;
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return NULL;
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}
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if (timeout == SM_TIME_DEFAULT)
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timeout = SM_TIME_FOREVER;
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if (timeout == SM_TIME_IMMEDIATE)
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{
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errno = EAGAIN;
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return NULL;
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}
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fp = sm_fp(type, ioflags, NULL);
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/* Okay, this is where we set the timeout. */
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if (timeout != SM_TIME_FOREVER)
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{
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if (setjmp(OpenTimeOut) != 0)
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{
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errno = EAGAIN;
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return NULL;
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}
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evt = sm_seteventm(timeout, openalrm, 0);
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}
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if ((*fp->f_open)(fp, info, flags, rpool) < 0)
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{
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fp->f_flags = 0; /* release */
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fp->sm_magic = NULL; /* release */
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return NULL;
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}
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/* We're back. So undo our timeout and handler */
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if (evt != NULL)
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sm_clrevent(evt);
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#if SM_RPOOL
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if (rpool != NULL)
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sm_rpool_attach_x(rpool, sm_io_fclose, fp);
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#endif /* SM_RPOOL */
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return fp;
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}
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/*
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** SM_IO_DUP -- duplicate a file pointer
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**
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** Parameters:
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** fp -- file pointer to duplicate
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**
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** Returns:
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** Success - the duplicated file pointer
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** Failure - NULL (was an invalid file pointer or too many open)
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**
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** Increments the duplicate counter (dup_cnt) for the open file pointer.
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** The counter counts the number of duplicates. When the duplicate
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** counter is 0 (zero) then the file pointer is the only one left
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** (no duplicates, it is the only one).
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*/
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SM_FILE_T *
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sm_io_dup(fp)
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SM_FILE_T *fp;
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{
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SM_REQUIRE_ISA(fp, SmFileMagic);
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if (fp->sm_magic != SmFileMagic)
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{
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errno = EBADF;
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return NULL;
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}
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if (fp->f_dup_cnt >= INT_MAX - 1)
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{
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/* Can't let f_dup_cnt wrap! */
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errno = EMFILE;
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return NULL;
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}
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fp->f_dup_cnt++;
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return fp;
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}
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/*
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** SM_IO_REOPEN -- open a new file using the old file pointer
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**
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** Parameters:
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** type -- file type to be opened
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** timeout -- time to complete the reopen
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** info -- infomation about what is to be "re-opened" (type dep.)
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** flags -- user flags to map to internal flags
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** rpool -- rpool file to be associated with
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** fp -- the file pointer to reuse
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**
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** Returns:
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** Raises an exception on heap exhaustion.
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** Aborts if type is invalid.
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** Failure: returns NULL
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** Success: returns "reopened" file pointer
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*/
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SM_FILE_T *
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sm_io_reopen(type, timeout, info, flags, rpool, fp)
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const SM_FILE_T *type;
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int SM_NONVOLATILE timeout;
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const void *info;
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int flags;
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const void *rpool;
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SM_FILE_T *fp;
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{
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int ioflags, ret;
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SM_FILE_T *fp2;
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SM_EVENT *evt = NULL;
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if ((ioflags = sm_flags(flags)) == 0)
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{
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(void) sm_io_close(fp, timeout);
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return NULL;
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}
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if (!Sm_IO_DidInit)
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sm_init();
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if (timeout == SM_TIME_DEFAULT)
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timeout = SM_TIME_FOREVER;
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if (timeout == SM_TIME_IMMEDIATE)
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{
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/*
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** Filling the buffer will take time and we are wanted to
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** return immediately. So...
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*/
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errno = EAGAIN;
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return NULL;
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}
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/* Okay, this is where we set the timeout. */
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if (timeout != SM_TIME_FOREVER)
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{
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if (setjmp(ReopenTimeOut) != 0)
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{
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errno = EAGAIN;
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return NULL;
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}
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evt = sm_seteventm(timeout, reopenalrm, 0);
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}
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/*
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** There are actually programs that depend on being able to "reopen"
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** descriptors that weren't originally open. Keep this from breaking.
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** Remember whether the stream was open to begin with, and which file
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** descriptor (if any) was associated with it. If it was attached to
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** a descriptor, defer closing it; reopen("/dev/stdin", "r", stdin)
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** should work. This is unnecessary if it was not a Unix file.
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*/
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if (fp != NULL)
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{
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if (fp->sm_magic != SmFileMagic)
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fp->f_flags = SMFEOF; /* hold on to it */
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else
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{
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/* flush the stream; ANSI doesn't require this. */
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(void) sm_io_flush(fp, SM_TIME_FOREVER);
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(void) sm_io_close(fp, SM_TIME_FOREVER);
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}
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}
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fp2 = sm_fp(type, ioflags, fp);
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ret = (*fp2->f_open)(fp2, info, flags, rpool);
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/* We're back. So undo our timeout and handler */
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if (evt != NULL)
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sm_clrevent(evt);
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if (ret < 0)
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{
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fp2->f_flags = 0; /* release */
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fp2->sm_magic = NULL; /* release */
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return NULL;
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}
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/*
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** We're not preserving this logic (below) for sm_io because it is now
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** abstracted at least one "layer" away. By closing and reopening
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** the 1st fd used should be the just released one (when Unix
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** behavior followed). Old comment::
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** If reopening something that was open before on a real file, try
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** to maintain the descriptor. Various C library routines (perror)
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** assume stderr is always fd STDERR_FILENO, even if being reopen'd.
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*/
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#if SM_RPOOL
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if (rpool != NULL)
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sm_rpool_attach_x(rpool, sm_io_close, fp2);
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#endif /* SM_RPOOL */
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return fp2;
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}
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/*
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** SM_IO_AUTOFLUSH -- link another file to this for auto-flushing
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**
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** When a read occurs on fp, fp2 will be flushed iff there is no
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** data waiting on fp.
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**
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** Parameters:
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** fp -- the file opened for reading.
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** fp2 -- the file opened for writing.
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**
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** Returns:
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** The old flush file pointer.
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*/
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SM_FILE_T *
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sm_io_autoflush(fp, fp2)
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SM_FILE_T *fp;
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SM_FILE_T *fp2;
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{
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SM_FILE_T *savefp;
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SM_REQUIRE_ISA(fp, SmFileMagic);
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if (fp2 != NULL)
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SM_REQUIRE_ISA(fp2, SmFileMagic);
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savefp = fp->f_flushfp;
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fp->f_flushfp = fp2;
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return savefp;
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}
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/*
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** SM_IO_AUTOMODE -- link another file to this for auto-moding
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**
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** When the mode (blocking or non-blocking) changes for fp1 then
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** update fp2's mode at the same time. This is to be used when
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** a system dup() has generated a second file descriptor for
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** another sm_io_open() by file descriptor. The modes have been
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** linked in the system and this formalizes it for sm_io internally.
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**
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** Parameters:
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** fp1 -- the first file
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** fp2 -- the second file
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**
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** Returns:
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** nothing
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*/
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void
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sm_io_automode(fp1, fp2)
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SM_FILE_T *fp1;
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SM_FILE_T *fp2;
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{
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SM_REQUIRE_ISA(fp1, SmFileMagic);
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SM_REQUIRE_ISA(fp2, SmFileMagic);
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fp1->f_modefp = fp2;
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fp2->f_modefp = fp1;
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}
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