faca6fbaa8
./src/H5Osdim.c -> H5Osdspace.c ./src/Makefile.in Changed the names of these files to better reflect what they actually do. ./src/H5.c ./src/H5AC.c ./src/H5B.c ./src/H5C.c ./src/H5D.c ./src/H5E.c ./src/H5Eprivate.h ./src/H5Epublic.h ./src/H5F.c ./src/H5Fcore.c ./src/H5Ffamily.c ./src/H5Fistore.c ./src/H5Flow.c ./src/H5Fsec2.c ./src/H5Fsplit.c ./src/H5Fstdio.c ./src/H5G.c ./src/H5Gent.c ./src/H5Gnode.c ./src/H5Gshad.c ./src/H5Gstab.c ./src/H5H.c ./src/H5M.c ./src/H5MF.c ./src/H5O.c ./src/H5Osdtyp.c (./src/H5Odtype.c) ./src/H5P.c ./src/H5T.c ./src/H5detect.c ./src/H5private.h Added an argument to the HRETURN_ERROR(), HGOTO_ERROR(), and HERROR() macros which is a string error message. This allows us to give extra information which can't be represented by the major and minor error numbers. This information was previously in comments just before or after the macro call. The string isn't currently used, but I'm planning to change the test files so they print an error trace when something fails. This should make debugging a little faster since it's often obvious what's wrong if we could just see the error stack without even having to start a debugger.
290 lines
7.5 KiB
C
290 lines
7.5 KiB
C
/*
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* Copyright (C) 1997 NCSA
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* All rights reserved.
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*
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* Programmer: Robb Matzke <matzke@llnl.gov>
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* Wednesday, October 22, 1997
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*
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* Purpose: This is the Posix section-2 I/O subclass of H5Flow.
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*
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* Notes: This driver keeps track of its own file position in order to
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* minimize the number of calls to lseek(). We assume that
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* opening a file sets the current file position to the beginning
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* and that read() and write() modify the file position as
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* expected when they return successfully (unsuccessful return
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* leaves the file position undefined).
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*/
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#include <H5private.h>
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#include <H5Eprivate.h>
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#include <H5Fprivate.h>
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#include <H5MMprivate.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#define PABLO_MASK H5F_sec2
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static hbool_t interface_initialize_g = FALSE;
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#define INTERFACE_INIT NULL
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static H5F_low_t *H5F_sec2_open (const char *name, uintn flags, H5F_search_t*);
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static herr_t H5F_sec2_close (H5F_low_t *lf);
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static herr_t H5F_sec2_read (H5F_low_t *lf, const haddr_t *addr, size_t size,
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uint8 *buf);
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static herr_t H5F_sec2_write (H5F_low_t *lf, const haddr_t *addr, size_t size,
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const uint8 *buf);
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const H5F_low_class_t H5F_LOW_SEC2[1] = {{
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NULL, /* access method */
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H5F_sec2_open, /* open method */
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H5F_sec2_close, /* close method */
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H5F_sec2_read, /* read method */
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H5F_sec2_write, /* write method */
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NULL, /* flush method */
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NULL, /* extend method */
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}};
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/*-------------------------------------------------------------------------
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* Function: H5F_sec2_open
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*
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* Purpose: Opens a file with name NAME. The FLAGS are a bit field with
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* the possible values defined in H5F_low_open().
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*
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* Errors:
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* IO CANTOPENFILE Open failed.
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*
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* Return: Success: Low-level file pointer
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*
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* Failure: NULL
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*
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* Programmer: Robb Matzke
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* Wednesday, October 22, 1997
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*
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* Modifications:
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*
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*-------------------------------------------------------------------------
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*/
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static H5F_low_t *
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H5F_sec2_open (const char *name, uintn flags, H5F_search_t *key/*out*/)
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{
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uintn oflags;
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H5F_low_t *lf = NULL;
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int fd;
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struct stat sb;
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FUNC_ENTER (H5F_sec2_open, NULL);
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oflags = (flags & H5F_ACC_WRITE) ? O_RDWR : O_RDONLY;
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oflags |= (flags & H5F_ACC_CREAT) ? O_CREAT : 0;
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oflags |= (flags & H5F_ACC_EXCL) ? O_EXCL : 0;
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oflags |= (flags & H5F_ACC_TRUNC) ? O_TRUNC : 0;
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if ((fd=open (name, oflags, 0666))<0) {
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HRETURN_ERROR (H5E_IO, H5E_CANTOPENFILE, NULL, "open failed");
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}
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lf = H5MM_xcalloc (1, sizeof(H5F_low_t));
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lf->u.sec2.fd = fd;
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lf->u.sec2.op = H5F_OP_SEEK;
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lf->u.sec2.cur = 0;
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fstat (fd, &sb);
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lf->eof.offset = sb.st_size;
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if (key) {
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key->dev = sb.st_dev;
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key->ino = sb.st_ino;
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}
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FUNC_LEAVE (lf);
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}
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/*-------------------------------------------------------------------------
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* Function: H5F_sec2_close
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*
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* Purpose: Closes a file.
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*
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* Errors:
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* IO CLOSEERROR Close failed.
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*
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* Return: Success: SUCCEED
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*
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* Failure: FAIL
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*
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* Programmer: Robb Matzke
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* Wednesday, October 22, 1997
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*
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* Modifications:
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*
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*-------------------------------------------------------------------------
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*/
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static herr_t
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H5F_sec2_close (H5F_low_t *lf)
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{
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FUNC_ENTER (H5F_sec2_close, FAIL);
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if (close (lf->u.sec2.fd)<0) {
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HRETURN_ERROR (H5E_IO, H5E_CLOSEERROR, FAIL, "close failed");
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}
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lf->u.sec2.fd = -1;
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FUNC_LEAVE (SUCCEED);
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}
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/*-------------------------------------------------------------------------
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* Function: H5F_sec2_read
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*
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* Purpose: Reads SIZE bytes beginning at address ADDR in file LF and
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* places them in buffer BUF. Reading past the logical or
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* physical end of file returns zeros instead of failing.
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*
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* Errors:
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* IO READERROR Read failed.
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* IO SEEKERROR Lseek failed.
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*
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* Return: Success: SUCCEED
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*
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* Failure: FAIL
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*
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* Programmer: Robb Matzke
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* Wednesday, October 22, 1997
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*
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* Modifications:
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*
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*-------------------------------------------------------------------------
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*/
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static herr_t
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H5F_sec2_read (H5F_low_t *lf, const haddr_t *addr, size_t size, uint8 *buf)
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{
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ssize_t n;
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off_t offset;
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FUNC_ENTER (H5F_sec2_read, FAIL);
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/* Check for overflow */
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offset = addr->offset;
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assert ("address overflowed" && offset==addr->offset);
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assert ("overflow" && offset+size>=offset);
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/* Check easy cases */
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if (0==size) HRETURN (SUCCEED);
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if (offset>=lf->eof.offset) {
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HDmemset (buf, 0, size);
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HRETURN (SUCCEED);
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}
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/*
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* Optimize seeking. If that optimization is disabled then always call
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* lseek().
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*/
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if (!H5F_OPT_SEEK ||
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lf->u.sec2.op==H5F_OP_UNKNOWN ||
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lf->u.sec2.cur!=offset) {
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if (lseek (lf->u.sec2.fd, offset, SEEK_SET)<0) {
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HRETURN_ERROR (H5E_IO, H5E_SEEKERROR, FAIL, "lseek failed");
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}
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lf->u.sec2.cur = offset;
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}
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/*
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* Read zeros past the logical end of file (physical is handled below)
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*/
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if ((size_t)offset+size>lf->eof.offset) {
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size_t nbytes = (size_t)offset+size - lf->eof.offset;
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HDmemset (buf+size-nbytes, 0, nbytes);
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size -= nbytes;
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}
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/*
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* Read the data. If a read error occurs then set the last file operation
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* to UNKNOWN because the file position isn't guaranteed by Posix.
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*/
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if ((n=read (lf->u.sec2.fd, buf, size))<0) {
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lf->u.sec2.op = H5F_OP_UNKNOWN;
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HRETURN_ERROR (H5E_IO, H5E_READERROR, FAIL, "read failed");
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} else if (n<size) {
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HDmemset (buf+n, 0, size-n);
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}
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/*
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* Update the file position with the number of bytes actually read. This
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* might be different than the number requested.
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*/
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lf->u.sec2.op = H5F_OP_READ;
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lf->u.sec2.cur = offset + n;
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assert ("address overflowed" && lf->u.sec2.cur>=offset);
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FUNC_LEAVE (SUCCEED);
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}
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/*-------------------------------------------------------------------------
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* Function: H5F_sec2_write
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*
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* Purpose: Writes SIZE bytes from the beginning of BUF into file LF at
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* file address ADDR.
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*
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* Errors:
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* IO SEEKERROR Lseek failed.
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* IO WRITEERROR Write failed.
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*
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* Return: Success: SUCCEED
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*
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* Failure: FAIL
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*
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* Programmer: Robb Matzke
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* Wednesday, October 22, 1997
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*
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* Modifications:
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*
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*-------------------------------------------------------------------------
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*/
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static herr_t
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H5F_sec2_write (H5F_low_t *lf, const haddr_t *addr, size_t size,
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const uint8 *buf)
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{
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off_t offset;
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FUNC_ENTER (H5F_sec2_write, FAIL);
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/* Check for overflow */
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offset = addr->offset;
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assert ("address overflowed" && offset==addr->offset);
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assert ("overflow" && offset+size>=offset);
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/*
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* Optimize seeking. If that optimization is disabled then always call
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* lseek().
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*/
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if (!H5F_OPT_SEEK ||
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lf->u.sec2.op==H5F_OP_UNKNOWN ||
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lf->u.sec2.cur!=offset) {
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if (lseek (lf->u.sec2.fd, offset, SEEK_SET)<0) {
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HRETURN_ERROR (H5E_IO, H5E_SEEKERROR, FAIL, "lseek failed");
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}
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lf->u.sec2.cur = offset;
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}
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/*
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* Write the data to the file. If the write failed then set the
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* operation back to UNKNOWN since Posix doesn't gurantee its value.
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*/
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if (size != write (lf->u.sec2.fd, buf, size)) {
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lf->u.sec2.op = H5F_OP_UNKNOWN;
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HRETURN_ERROR (H5E_IO, H5E_WRITEERROR, FAIL, "write failed");
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}
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/*
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* Update the file position.
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*/
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lf->u.sec2.op = H5F_OP_WRITE;
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lf->u.sec2.cur = offset + size;
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assert ("address overflowed" && lf->u.sec2.cur>=offset);
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FUNC_LEAVE (SUCCEED);
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}
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