I can't compile these codes with g++.
my system is linux (kernel is 2.4.0 ).
When I try to compile this program with g++ -o semw semw.cpp
It always tells me that sem_open sem_close,sem_post do not exist.But I have checked semaphore.h,I can not find any problems.
Anyone can compile these codes in system linux ,and tell me the result ?May be it is the bug of linux ? added code tags for readability --oombera
Hi, folks.
Sorry for bothering, but maybe someone could help me please.
The problem is the following:
there is some script that copies files from local file system to AFS. The copying is performed with dd command.
The script copies data into some AFS volumes.
The problem appeared with one... (0 Replies)
I am on HP-UX delta B.11.11
I am using sem_open() and compiling/linking the library by specifying -lrt.
Then, I am creating library like below:
ar cr $libdir/liboscfe.a `cat fe.libs.$$ com.libs.$$`
ranlib $libdir/liboscfe.a
Now, I am compiling another utility sch2db which requires this... (1 Reply)
Hi
Please help me with the following problem with my script.
The following block of code is not repeating in the while loop and exiting after searching for first message.
input_file
==========
host001-01
host001-02
2008-07-23 13:02:04,651 ConnectionFactory - Setting session state... (2 Replies)
Hi
I am right now facing a strange hardware problem. System get booted with the following error:
Fatal Error Reset
CPU 0000.0000.0000.0003 AFSR 0100.0000.0000.0000 SCE
AFAR 0000.07c6.0000.1000
SC Alert: Host System has Reset
It happen 4 or 5 times and get the same error every time.I... (8 Replies)
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)
Hi,
i've a redhat linux 9 upadated by redhat from 7 version to 9 version. A couple of days ago i was a problem with my mail, in other words i'm not able to get any email nor to send any email. I've a proxy configuration and i tried to set iptables in order to verify the port. The 110,255 and 995... (1 Reply)
At work I am trying to get this one Linux machine (let's call it ctesgm07) to behave like another Linux machine that we have (let's call it test007).
test007 returns the following version info:
cat /etc/debian_version: lenny/sid
uname -a: Linux test007 2.6.27-7-generic #1 SMP Tue Nov 4... (0 Replies)
Dear ALL.
I installed AIX OS on customer sites.
but Only one site is too slow when I connected telnet, ftp..
Ping is too fast. but telnet and FTP is not connected..
of course i check the configuration file on aix but it's normal.
Do any Idea??
thanks in advance.
- Jun - (3 Replies)
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)
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
LEARN ABOUT LINUX
sem_open
SEM_OPEN(3) Linux Programmer's Manual SEM_OPEN(3)NAME
sem_open - initialize and open a named semaphore
SYNOPSIS
#include <fcntl.h> /* For O_* constants */
#include <sys/stat.h> /* For mode constants */
#include <semaphore.h>
sem_t *sem_open(const char *name, int oflag);
sem_t *sem_open(const char *name, int oflag,
mode_t mode, unsigned int value);
Link with -lrt or -pthread.
DESCRIPTION
sem_open() creates a new POSIX semaphore or opens an existing semaphore. The semaphore is identified by name. For details of the con-
struction of name, see sem_overview(7).
The oflag argument specifies flags that control the operation of the call. (Definitions of the flags values can be obtained by including
<fcntl.h>.) If O_CREAT is specified in oflag, then the semaphore is created if it does not already exist. The owner (user ID) of the sem-
aphore is set to the effective user ID of the calling process. The group ownership (group ID) is set to the effective group ID of the
calling process. If both O_CREAT and O_EXCL are specified in oflag, then an error is returned if a semaphore with the given name already
exists.
If O_CREAT is specified in oflag, then two additional arguments must be supplied. The mode argument specifies the permissions to be placed
on the new semaphore, as for open(2). (Symbolic definitions for the permissions bits can be obtained by including <sys/stat.h>.) The per-
missions settings are masked against the process umask. Both read and write permission should be granted to each class of user that will
access the semaphore. The value argument specifies the initial value for the new semaphore. If O_CREAT is specified, and a semaphore with
the given name already exists, then mode and value are ignored.
RETURN VALUE
On success, sem_open() returns the address of the new semaphore; this address is used when calling other semaphore-related functions. On
error, sem_open() returns SEM_FAILED, with errno set to indicate the error.
ERRORS
EACCES The semaphore exists, but the caller does not have permission to open it.
EEXIST Both O_CREAT and O_EXCL were specified in oflag, but a semaphore with this name already exists.
EINVAL value was greater than SEM_VALUE_MAX.
EINVAL name consists of just "/", followed by no other characters.
EMFILE The process already has the maximum number of files and open.
ENAMETOOLONG
name was too long.
ENFILE The system limit on the total number of open files has been reached.
ENOENT The O_CREAT flag was not specified in oflag and no semaphore with this name exists; or, O_CREAT was specified, but name wasn't well
formed.
ENOMEM Insufficient memory.
CONFORMING TO
POSIX.1-2001.
SEE ALSO sem_close(3), sem_getvalue(3), sem_post(3), sem_unlink(3), sem_wait(3), sem_overview(7)COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2009-02-20 SEM_OPEN(3)