11-13-2009
10 More Discussions You Might Find Interesting
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,
Arunkumar (4 Replies)
Discussion started by: arunkumar_mca
4 Replies
2. AIX
1) when user login to the server the session got colosed. How will resolve?
2) While firing the command ls -l we are not able to see the any files in the director. but over all view the file system using the command df -g it is showing 91% used. what will be the problem?
Thanks in advance. (1 Reply)
Discussion started by: pernasivam
1 Replies
3. UNIX for Dummies Questions & Answers
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)
Discussion started by: joker40
9 Replies
4. IP Networking
Hi,
This is rather a question from a "user" than from a sys admin, but I think this forum is apropriate for the question.
I have an adress with automatic email forwarding and for some senders (two hietherto), emails are bouncing. This has really created a lot of problems those two time so I... (0 Replies)
Discussion started by: carwe
0 Replies
5. UNIX for Dummies Questions & Answers
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)
Discussion started by: Humudituu
4 Replies
6. UNIX for Dummies Questions & Answers
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)
Discussion started by: Deepak Raj
3 Replies
7. Programming
I think both write at the end of the file ......
but is there a sharp difference between those 2 instruction .....
thank you
this is my 3rd question today forgive me :D (1 Reply)
Discussion started by: fwrlfo
1 Replies
8. AIX
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)
Discussion started by: m_raheelahmed
4 Replies
9. Programming
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;
}
always returns with "illegal seek"... (2 Replies)
Discussion started by: Sir_Tomasz
2 Replies
10. UNIX for Dummies Questions & Answers
I don't know if you guys get this problem sometimes at Terminal but I had been having this problem since yesterday :( Maybe I overdid the Terminal. Even the codes that used to work doesn't work anymore.
Here is what 's happening:
* I wanted to remove lines containing digits so I used this... (25 Replies)
Discussion started by: Nexeu
25 Replies
LSEEK(2) System Calls Manual LSEEK(2)
NAME
lseek, tell - move read/write pointer
SYNOPSIS
long lseek(fildes, offset, whence)
long offset;
long tell(fildes)
DESCRIPTION
The file descriptor refers to a file open for reading or writing. The read (resp. write) pointer for the file is set as follows:
If whence is 0, the pointer is set to offset bytes.
If whence is 1, the pointer is set to its current location plus offset.
If whence is 2, the pointer is set to the size of the file plus offset.
The returned value is the resulting pointer location.
The obsolete function tell(fildes) is identical to lseek(fildes, 0L, 1).
Seeking far beyond the end of a file, then writing, creates a gap or `hole', which occupies no physical space and reads as zeros.
SEE ALSO
open(2), creat(2), fseek(3)
DIAGNOSTICS
-1 is returned for an undefined file descriptor, seek on a pipe, or seek to a position before the beginning of file.
BUGS
Lseek is a no-op on character special files.
ASSEMBLER
(lseek = 19.)
(file descriptor in r0)
sys lseek; offset1; offset2; whence
Offset1 and offset2 are the high and low words of offset; r0 and r1 contain the pointer upon return.
LSEEK(2)