www.pudn.com > bootmenu.zip > S_ESIX.C

/* This file contains system-specific functions for ESIX. 
 * The program pfdisk.c calls these routines. 
 * Note that ESIX can't use the generic Sys.V/386 version of 
 * this file because it uses ioctl calls to access the 
 * primary boot sector.  Other systems provide a device which 
 * maps onto the whole disk (starting with the boot sector). 
 */ 
#include  
#include  
#include  
#include  
 
#define extern 
#include "sysdep.h" 
#undef extern 
 
int usage(prog)	/* print a usage message */ 
char	*prog;	/* program name */ 
{ 
  fprintf(stderr,"Usage: %s dev\n\t%s\n", prog, 
	  "where 'dev' is the device name, i.e. /dev/rdsk/0s0"); 
} 
 
void getGeometry(dev, c, h, s) 
char	*dev;		/* device name */ 
unsigned *c,*h,*s;	/* cyls, heads, sectors */ 
{ 
  int devfd, retval; 
  struct disk_parms dp; 
   
  devfd = open(dev, O_RDONLY, 0); 
  if (devfd < 0) { 
    fprintf(stderr,"%s: can't open for reading\n", dev); 
    return; 
  } 
  retval = ioctl(devfd, V_GETPARMS, &dp); 
  close(devfd); 
  if (retval < 0) { 
    fprintf(stderr,"%s: can't get disk parameters\n", dev); 
    return; 
  } 
  if (dp.dp_type != DPT_WINI) { 
    fprintf(stderr,"%s: not a Winchester Disk\n", dev); 
    return; 
  } 
  *c = dp.dp_cyls; 
  *h = dp.dp_heads; 
  *s = dp.dp_sectors; 
} 
 
int getFile(name, buf, len)	/* read file into buffer */ 
char	*name, *buf; 
int	len; 
{	/* (open, read, close) */ 
  int devfd, retval; 
   
  devfd = open(name, O_RDONLY, 0); 
  if (devfd < 0) { 
    fprintf(stderr,"%s: can't open for reading\n", name); 
    return(devfd); 
  } 
  retval = read(devfd, buf, len); 
  if (retval < 0) 
    fprintf(stderr,"%s: read failed\n", name); 
  close(devfd); 
  return(retval); 
} 
 
int putFile(name, buf, len)	/* write buffer to file */ 
char	*name, *buf; 
int	len; 
{	/* (open, write, close) */ 
  int devfd, retval; 
   
  devfd = open(name, O_WRONLY|O_CREAT, 0666); 
  if (devfd < 0) { 
    fprintf(stderr,"%s: can't open for writing\n", name); 
    return(devfd); 
  } 
  retval = write(devfd, buf, len); 
  if (retval < 0) 
    fprintf(stderr,"%s: write failed\n", name); 
  close(devfd); 
  return(retval); 
} 
 
int getBBlk(name, buf)	/* read Boot Block into buffer */ 
char	*name, *buf; 
{	/* (open, read, close) */ 
  int devfd, retval; 
  struct absio abs; 
   
  devfd = open(name, O_RDONLY, 0); 
  if (devfd < 0) { 
    fprintf(stderr,"%s: can't open for reading\n", name); 
    return(devfd); 
  } 
  abs.abs_sec = 0;	/* the primary boot sector */ 
  abs.abs_buf = buf; 
  retval = ioctl(devfd, V_RDABS, &abs); 
  if (retval < 0) 
    fprintf(stderr,"%s: read failed\n", name); 
  close(devfd); 
  return(retval); 
} 
 
int putBBlk(name, buf)	/* write buffer to Boot Block */ 
char	*name, *buf; 
{	/* (open, write, close) */ 
  int devfd, retval; 
  struct absio abs; 
   
  devfd = open(name, O_WRONLY, 0); 
  if (devfd < 0) { 
    fprintf(stderr,"%s: can't open for writing\n", name); 
    return(devfd); 
  } 
  abs.abs_sec = 0;	/* the primary boot sector */ 
  abs.abs_buf = buf; 
  retval = ioctl(devfd, V_WRABS, &abs); 
  if (retval < 0) 
    fprintf(stderr,"%s: write failed\n", name); 
  close(devfd); 
  return(retval); 
}