POSIX standards specify what has to be in a struct, the standards do not restrict additional struct members.
From POSIX on struct fl:
Code:
The structure flock describes a file lock. It shall include the following members:
short l_type Type of lock; F_RDLCK, F_WRLCK, F_UNLCK.
short l_whence Flag for starting offset.
off_t l_start Relative offset in bytes.
off_t l_len Size; if 0 then until EOF.
pid_t l_pid Process ID of the process holding the lock; returned with F_GETLK.
The mode_t, off_t, and pid_t types shall be defined as described in <sys/types.h>.
hi, I need to know how to lock a file. I used the following code, but after executing the program the file 'write.txt' remined empty, and I have no idea why.Maybe I'm not using the corresponding syntax for blocking a file. But I deleted then the blocking part and the problem persisted.
see to... (2 Replies)
I'm in the same boat as Barbus - same exercis (https://www.unix.com/shell-programming-scripting/43609-processes-users.html)
The following script works on a solaris server I have access to. It doesn't however, work on the companies Linux machine. Any idea what's up? I have very little shell... (0 Replies)
I have very simple client - server setup, where client connects, exchanges some messages with the server and then closes socket and exits. Everythink works OK, except when I am trying to change socket to be non-blocking AND the shell happens to be plain old Bourne. It runs no problem under ksh or... (3 Replies)
Hello,
I found this command works on Linux:
$ echo `uptime` | awk -F "load average: " '{ print $2 }'
1.60, 1.53, 1.46
but got error on Solaris:
$ echo `uptime` | awk -F "load average: " '{ print $2 }'
awk: syntax error near line 1
awk: bailing out near line 1
$ which awk... (2 Replies)
Hello
I have a Perl script that works on non-darwin Mac OS X environments and I think I have narrowed down the issue to a file locking problem.
In other linux environments, the flock struct is defined differently. I have adjusted this via the reference for Mac OS X fcntl(2) man page. The... (4 Replies)
Hi, I have a question.
I define a function using sed command:
replace()
{
searchterm=$1
replaceterm=$2
sed -e "s/$searchterm/$replaceterm/ig" $3 > $WORK'tempfile.tmp'
mv $WORK'tempfile.tmp' $3
}
Then I call
replace 'test = 0' 'test = 1' $myfileThis code works well in... (1 Reply)
Hi, I have a question.
I define a function using sed command:
replace()
{
searchterm=$1
replaceterm=$2
sed -e "s/$searchterm/$replaceterm/ig" $3 > $WORK'tempfile.tmp'
mv $WORK'tempfile.tmp' $3
}
Then I call
replace 'test = 0' 'test = 1' $myfile
This code... (1 Reply)
Good evening, friends
I'm learning with a book: Programming Linux by Kurt Wall (Prentice Hall)
The code below could run in two windows (./lockit /tmp/foo in both for example). There is not problem with the read block (first byte) but when one, apply the write block while in the other is... (1 Reply)
Hello,
I have a ksh script that uses code below. For some reason it works under linux but fails in unix. Any idea why?
if ]; then ...
Thanks (9 Replies)
Hello folks,
I pretend acquire this hardware:
1-Motherboard Asus Skt1151 - H110M-A/M.2 (https://www.asus.com/pt/Motherboards...cifications/);
2-Intel i5 6400 2.7Ghz QuadCore Skt1151;
or
2-Intel i5 6500 3.2Ghz QuadCore Skt1151;
3-Dimm 8GB DDR4 Kingston CL15 2133Mhz;
Obvious I pretend... (1 Reply)
Discussion started by: enodev
1 Replies
LEARN ABOUT LINUX
uuid_compare
UUID_COMPARE(3) Libuuid API UUID_COMPARE(3)NAME
uuid_compare - compare whether two UUIDs are the same
SYNOPSIS
#include <uuid/uuid.h>
int uuid_compare(uuid_t uu1, uuid_t uu2)
DESCRIPTION
The uuid_compare function compares the two supplied uuid variables uu1 and uu2 to each other.
RETURN VALUE
Returns an integer less than, equal to, or greater than zero if uu1 is found, respectively, to be lexigraphically less than, equal, or
greater than uu2.
AUTHOR
Theodore Y. Ts'o
AVAILABILITY
libuuid is part of the util-linux package since version 2.15.1 and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
SEE ALSO uuid(3), uuid_clear(3), uuid_copy(3), uuid_generate(3), uuid_is_null(3), uuid_parse(3), uuid_unparse(3)util-linux May 2009 UUID_COMPARE(3)