I've got a c++ program that works fine on Linux, compiles on Solaris fine with g++, but will not write to a fstream correctly in a class object.
And I've run into numerous other bugs in the disk management.
Jon (4 Replies)
I have a question about how to get the exit code of the first command when it appears in a pipe-lined command.
For example, I have the following script:
grep abc dddd | tee -a log
if ]
then
echo "ERROR!"
fi
In the above script, ] is supposed to test the exit code of "grep abc... (3 Replies)
I have a file called "library" with the following content
libnxrdbmgr.a
libnxrdbmgr.so
libnxtk.a
libnxtk.so
libora0d_nsc_osi.so
I am trying to locate if these libraries are on my machine or not. find command runs for about few seconds and hangs after this.
Can someone please help me and... (3 Replies)
Hello,
I could not find the exactly same post here.. so I will explain what I did to get the last month using date command.
I used
date +%Y-%m -d "-1 months"
to get the last month. However, the returned value of above command on 2009/10/31 was 2009 10 and not 2009 09.. and the... (9 Replies)
Hi,
I am running the following command, and it tries to delete some dn from ldap, however, it takes lot of time before it finally request LDAP server to delete it.
I am trying to find why it is taking lot of time. Could you anyone help me in this regard. I have copies the pstack output, and... (3 Replies)
Hi there can anyone help me
here is my code
echo "Type in a positive number"
read X
I=2
while
do
if
then
echo "It is not prime"
break
else
if
then
echo "It is prime"
break
else
I=$(( $I + 1))
fi
fi (4 Replies)
Hi,
I have Solaris-10 OS on T5220. Both local disks were mirrored under SVM. Somehow when one disk gone bad (c0t1d0), other disk (c0t0d0) also got lot of bad block. We have readable data only on c0t0d0, but as soon as server comes after, it hangs when I run few commands because of read errors,... (1 Reply)
I am trying to compile the datastage jobs using the Execute Command stage in datastage 11 or any Routines if possible. My datastage is on Unix machine.
So, How can I Compile a datastage job in UNIX from command line or any Routines.
Please help me in doing so.
Thank you. (1 Reply)
Hello guys,
I have an issue when trying to do an egrep -v on a file, let me show you.
I want to filter the last column as to where it filters out the columns with asterisks and zeros ( * and 0 ) it is working properly up to a certain point where I have a value of '10000' which is also getting... (3 Replies)
Discussion started by: evergreen
3 Replies
LEARN ABOUT SUSE
pipe2
PIPE(2) Linux Programmer's Manual PIPE(2)NAME
pipe, pipe2 - create pipe
SYNOPSIS
#include <unistd.h>
int pipe(int pipefd[2]);
#define _GNU_SOURCE
#include <unistd.h>
int pipe2(int pipefd[2], int flags);
DESCRIPTION
pipe() creates a pipe, a unidirectional data channel that can be used for interprocess communication. The array pipefd is used to return
two file descriptors referring to the ends of the pipe. pipefd[0] refers to the read end of the pipe. pipefd[1] refers to the write end
of the pipe. Data written to the write end of the pipe is buffered by the kernel until it is read from the read end of the pipe. For fur-
ther details, see pipe(7).
If flags is 0, then pipe2() is the same as pipe(). The following values can be bitwise ORed in flags to obtain different behavior:
O_NONBLOCK Set the O_NONBLOCK file status flag on the two new open file descriptions. Using this flag saves extra calls to fcntl(2) to
achieve the same result.
O_CLOEXEC Set the close-on-exec (FD_CLOEXEC) flag on the two new file descriptors. See the description of the same flag in open(2) for
reasons why this may be useful.
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
ERRORS
EFAULT pipefd is not valid.
EINVAL (pipe2()) Invalid value in flags.
EMFILE Too many file descriptors are in use by the process.
ENFILE The system limit on the total number of open files has been reached.
VERSIONS
pipe2() was added to Linux in version 2.6.27; glibc support is available starting with version 2.9.
CONFORMING TO
pipe(): POSIX.1-2001.
pipe2() is Linux-specific.
EXAMPLE
The following program creates a pipe, and then fork(2)s to create a child process; the child inherits a duplicate set of file descriptors
that refer to the same pipe. After the fork(2), each process closes the descriptors that it doesn't need for the pipe (see pipe(7)). The
parent then writes the string contained in the program's command-line argument to the pipe, and the child reads this string a byte at a
time from the pipe and echoes it on standard output.
#include <sys/wait.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
int
main(int argc, char *argv[])
{
int pipefd[2];
pid_t cpid;
char buf;
if (argc != 2) {
fprintf(stderr, "Usage: %s <string>
", argv[0]);
exit(EXIT_FAILURE);
}
if (pipe(pipefd) == -1) {
perror("pipe");
exit(EXIT_FAILURE);
}
cpid = fork();
if (cpid == -1) {
perror("fork");
exit(EXIT_FAILURE);
}
if (cpid == 0) { /* Child reads from pipe */
close(pipefd[1]); /* Close unused write end */
while (read(pipefd[0], &buf, 1) > 0)
write(STDOUT_FILENO, &buf, 1);
write(STDOUT_FILENO, "
", 1);
close(pipefd[0]);
_exit(EXIT_SUCCESS);
} else { /* Parent writes argv[1] to pipe */
close(pipefd[0]); /* Close unused read end */
write(pipefd[1], argv[1], strlen(argv[1]));
close(pipefd[1]); /* Reader will see EOF */
wait(NULL); /* Wait for child */
exit(EXIT_SUCCESS);
}
}
SEE ALSO fork(2), read(2), socketpair(2), write(2), popen(3), pipe(7)COLOPHON
This page is part of release 3.25 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 2009-09-15 PIPE(2)