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Effect of Call to lseek( )
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Count the offset from the start of the file Count the offset from the current position Count the offset from the end of the file
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I/O Functions
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The following macros are defined in <ioh> They can be used for a value of origin in order of 0 through 2 SEEK_SET SEEK_CUR SEEK_END The lseek( ) function returns offset on success Therefore, lseek( ) will be returning a long integer Upon failure, a 1L is returned and errno is set to one of these values;
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THE C++ BUILDER FUNCTION LIBRARY
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Example
The example shown here allows you to examine a file one sector at a time using the UNIX-like I/O system You will want to change the buffer size to match the sector size of your system
#include #include #include #include #include <stdioh> <fcntlh> <sys\stath> <ioh> <stdlibh> 128
#define BUF_SIZE
/* read buffers using lseek() */ int main(int argc, char *argv[]) { char buf[BUF_SIZE+1], s[10]; int fd, sector; buf[BUF_SIZE+1] = '\0'; /* null terminate buffer for printf */ if((fd=open(argv[1], O_RDONLY | O_BINARY))==-1) { /* open for write */ printf("Cannot open file\n"); exit(0); } do { printf("Buffer: "); gets(s);
Borland C++ Builder: The Complete Reference
sector = atoi(s); /* get the sector to read */ if(lseek(fd, (long)sector*BUF_SIZE,0)==-1L) printf("Seek Error\n"); if(read(fd, buf, BUF_SIZE)==0) { printf("Read Error\n"); } else { printf("%s\n", buf); } } while(sector > 0); close(fd); return 0; }
Related Functions
read( ), write( ), open( ), close( )
int open(const char *filename, int access, unsigned mode) int _rtl_open(const char *filename, int access)
Description
The prototypes for open( ) and _rtl_open( ) are found in <ioh> The open( ) function is part of the UNIX-like I/O system and is not defined by the ANSI/ISO C/C++ standard Unlike the C/C++ I/O system, the UNIX-like system does not use file pointers of type FILE, but rather file descriptors of type int The open( ) function opens a file with the name filename and sets its access mode as specified by access You can think of access as being constructed of a base mode of operation plus modifiers The following base modes are allowed
Base
O_RDONLY O_WRONLY O_RDWR
Meaning
Open for read only Open for write only Open for read/write
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I/O Functions
After selecting one of these values, you may OR it with one or more of the following access modifiers:
Access modifiers
O_NDELAY O_APPEND O_CREAT O_TRUNC O_EXCL O_BINARY O_TEXT
Meaning
Not used; included for UNIX compatibility Causes the file pointer to be set to the end of the file before to each write operation If the file does not exist, creates it with its attribute set to the value of mode If the file exists, truncates it to length 0 but retains its file attributes When used with O_CREAT, will not create output file if a file by that name already exists Opens a binary file Opens a text file
THE C++ BUILDER FUNCTION LIBRARY
The mode argument is required only if the O_CREAT modifier is used In this case, mode may be one of three values:
Mode
S_IWRITE S_IREAD S_IWRITE | S_IREAD
Meaning
Write access Read access Read/write access
A successful call to open( ) returns a positive integer that is the file descriptor associated with the file A return value of 1 means that the file cannot be opened, and errno is set to one of these values: ENOENT EMFILE EACCES EINVACC File does not exist Too many open files Access denied Access code is invalid
Borland C++ Builder: The Complete Reference
The function _rtl_open( ) accepts a larger number of modifiers for the access parameter These additional values are
Access Modifier
O_NOINHERIT SH_COMPAT SH_DENYRW SH_DENYWR SH_DENYRD SH_DENYNO
Meaning
File not passed to child programs Other open operations that use SH_COMPAT are allowed Only the current file descriptor has access to the file Only read access to the file allowed Only write access to the file allowed Allow other sharing options except SH_COMPAT
Example
You will usually see the call to open( ) like this:
if((fd=open(filename, mode)) == -1) printf("Cannot open file\n"); exit(1); } {
Related Functions
close( ), read( ), write( )
void perror(const char *str)
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