Lseek implementation Post: 302554901

10 More Discussions You Might Find Interesting

1. Programming

lseek in c

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

2. Shell Programming and Scripting

Need help on AWK implementation

Hi, I am accepting a string from user. compare this output with the awk output as below... echo "\n\n\tDay : \c" read day awk '{ if($day == $2) { if ($mon == $1) { print "Yes" }}}' syslog.txt I am getting the follwoing error awk: Field $() is not correct. The input line...

3. Programming

Hairy Problem! lseek over 4G

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...

4. Programming

Malloc implementation in C

Hey Guys I am trying to implement the malloc function for my OS class and I am having a little trouble with it. I would be really grateful if I could get some hints on this problem. So I am using a doubly-linked list as my data structure and I have to allocate memory for it (duh...). The...

5. UNIX for Advanced & Expert Users

Malloc Implementation in C

Hey Guys Some of my friends have got together and we are trying to write a basic kernel similar to Linux. I am trying to implement the malloc function in C and I am using a doubly linked list as the primary data structure. I need to allocate memory for this link list (duh...) and I don't feel...

6. UNIX for Dummies Questions & Answers

lseek() equivalent

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?

7. UNIX for Dummies Questions & Answers

Understanding lseek

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...

8. Programming

what is the main difference between difference between using nonatomic lseek and O_APPEND

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

9. AIX

Backup: The lseek call failed

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...

10. Programming

Problem with lseek call.

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"...

LEARN ABOUT SUNOS

sd-readahead

SD-READAHEAD(7) 						   sd-readahead 						   SD-READAHEAD(7)

NAME

       sd-readahead - Reference implementation of APIs for controlling boot-time read-ahead

SYNOPSIS

       #include "sd-readahead.h"

DESCRIPTION

       sd-readahead.c and sd-readahead.h provide a reference implementation for APIs for controlling boot-time read-ahead, as implemented by the
       read-ahead subsystem of the systemd(1) init system.

       See sd_readahead(3) for more information about the function implemented.

NOTES

       This interface is provided by the reference implementation of APIs for controlling boot-time read-ahead and distributed with the systemd
       package. The algorithms it implements are simple, and can easily be reimplemented in daemons if it is important to support this interface
       without using the reference implementation. See the respective function man pages for details.

       In addition, for details about the algorithms check the liberally licensed reference implementation sources:
       http://cgit.freedesktop.org/systemd/systemd/plain/src/readahead/sd-readahead.c resp.
       http://cgit.freedesktop.org/systemd/systemd/plain/src/systemd/sd-readahead.h

       These APIs are implemented in the reference implementation's drop-in sd-readahead.c and sd-readahead.h files. It is recommended that
       applications consuming these APIs copy the implementation into their source tree, either verbatim or in excerpts. These interfaces are
       currently not available in a dynamic library.

       The functions provided by this interface become NOPs when -DDISABLE_SYSTEMD is set during compilation. In addition, if sd-readhead.c is
       compiled on non-Linux systems it becomes NOPs.

SEE ALSO

       systemd(1), sd_readahead(3), sd-daemon(7)

AUTHOR

       Lennart Poettering <lennart@poettering.net>
	   Developer

systemd 							    03/16/2012							   SD-READAHEAD(7)

10 More Discussions You Might Find Interesting

1. Programming

lseek in c

Discussion started by: arunkumar_mca

2. Shell Programming and Scripting

Need help on AWK implementation

Discussion started by: EmbedUX

3. Programming

Hairy Problem! lseek over 4G

Discussion started by: macroideal

4. Programming

Malloc implementation in C

Discussion started by: Gambit_b