11-13-2009
Hairy Problem! lseek over 4G
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1. Programming
sir,
i used lssek as this
lseek(fp,-10,2);
i am not getting any output i dont now why can you explan sir..
Thanks in advance,
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The following code:
int fd;
if (fd = open("mem", O_RDONLY) == -1)
return 1;
if (lseek(fd, 0, SEEK_SET) == -1) {
char *buf = malloc(512);
buf = strerror(errno);
printf("%s\n", buf);
return 1;
}
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LSEEK(2) Linux Programmer's Manual LSEEK(2)
NAME
lseek - reposition read/write file offset
SYNOPSIS
#include <sys/types.h>
#include <unistd.h>
off_t lseek(int fd, off_t offset, int whence);
DESCRIPTION
The lseek() function repositions the offset of the open file associated with the file descriptor fd to the argument offset according to the
directive whence as follows:
SEEK_SET
The offset is set to offset bytes.
SEEK_CUR
The offset is set to its current location plus offset bytes.
SEEK_END
The offset is set to the size of the file plus offset bytes.
The lseek() function allows the file offset to be set beyond the end of the file (but this does not change the size of the file). If data
is later written at this point, subsequent reads of the data in the gap (a "hole") return null bytes ('