Dear Friends,
I write a c program to list the directories recursively. For this I write a function called my_readdir to read the content of directory. For this I use read system call it returns -1, then I use readdir system call it gives comment terminated error or segmentation... (1 Reply)
hi,
where can I find the detail information about the syscall in binary instructions of linux/mips.
for example, in linux/mips:
li v0, 4140
syscall
it's a syacall of "lseek" , but how can I find that which registers will be used in this syscall , and the meaning of the arguments in the... (2 Replies)
recently my project needs me to lseek a position over 4G size....
i found in linux or unix the parameters are all ulong 32 bits...the limit dooms the movement of a position over 4G
I was told that i should lseek64 to meet my need... but i have no idea where i can get the function neither by "man... (8 Replies)
I know there is lseek() function that will allow to write or read from certain position in the file. Is there similar function that will let do same but for array rather then file? (9 Replies)
Hi everybody,
i've been googling for ages now and gotten kinda desperate... The question, however, might be rather trivial for the experts: What is it exactly, i.e. physically, the POSIX function (for a file) "lseek" does? Does it trigger some kind of synchronization on disk? Is it just for the... (4 Replies)
I tried to use lseek system call to determine the number of bytes in a file. To do so, I used open system call with O_APPEND flag to open a file. As lseek returns the current offset so I called lseek for opened file with offset as zero and whence as SEEK_CUR. So I guess it must return the number of... (3 Replies)
Hi,
We are facing issues while backing up our 1205 GB filesystem on LTO5 Tape. During backup the "backup: The lseek call failed." messages were generated, I want to know why these messages were generating
AIX version is: 6100-08-00-0000
backup: The date of this level 0 backup is Mon Mar 11... (4 Replies)
Hi all...
I am trying to create a shell project purely for this Macbook Pro.
I do NOT want to use SOX as the sampling _source_ but Quicktime
instead, the idea being that NO third party installs will be needed.
The code below works fine except the commented out Applescript line
does not do... (2 Replies)
Discussion started by: wisecracker
2 Replies
LEARN ABOUT OPENDARWIN
lseek
LSEEK(2) BSD System Calls Manual LSEEK(2)NAME
lseek -- reposition read/write file offset
SYNOPSIS
#include <unistd.h>
off_t
lseek(int fildes, off_t offset, int whence);
DESCRIPTION
The lseek() function repositions the offset of the file descriptor fildes to the argument offset according to the directive whence. The argu-
ment fildes must be an open file descriptor. Lseek() repositions the file pointer fildes as follows:
If whence is SEEK_SET, the offset is set to offset bytes.
If whence is SEEK_CUR, the offset is set to its current location plus offset bytes.
If whence is 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 existing end-of-file of the file. If data is later written at
this point, subsequent reads of the data in the gap return bytes of zeros (until data is actually written into the gap).
Some devices are incapable of seeking. The value of the pointer associated with such a device is undefined.
RETURN VALUES
Upon successful completion, lseek() returns the resulting offset location as measured in bytes from the beginning of the file. Otherwise, a
value of -1 is returned and errno is set to indicate the error.
ERRORS
Lseek() will fail and the file pointer will remain unchanged if:
[EBADF] Fildes is not an open file descriptor.
[ESPIPE] Fildes is associated with a pipe, socket, or FIFO.
[EINVAL] Whence is not a proper value.
SEE ALSO dup(2), open(2)BUGS
This document's use of whence is incorrect English, but is maintained for historical reasons.
STANDARDS
The lseek() function conforms to IEEE Std 1003.1-1988 (``POSIX.1'').
4th Berkeley Distribution April 19, 1994 4th Berkeley Distribution