Piping enables me to read the console output of a process. I did a fair bit of piping, back when I ported CMake to the Amiga platform.
Now, I simply do not get: How does that give me access to the symbols of the execve process? AFAICS there is no way, that a random process like 'ls' is going to come up with a generalized form of submitting a symbol value (ie. "main = 0xbeefdeaf") to either the stdin, stdout or stderr. I guess, if I *could* interrerupt the child process and execute something like
Hi@all,
I try to compile c code on hpux 11.11 pa-risc 2 with gcc (32bit). I compile with the option -g, so that I get the symbol table, but it is not available. Does someone knows something on this?
thx (2 Replies)
Folks,
I have some program(Test.cpp) as follows,
#include<iostream>
class Abc
{
private:
int _theVar;
public :
int printVar();
};
int Abc :: printVar()
{
_theVar=10;
}
main()
{
Abc _t; (0 Replies)
Folks,
I have some program(Test.cpp) as follows,
#include<iostream>
class Abc
{
private:
int _theVar;
public :
int printVar();
};
int Abc :: printVar()
{
_theVar=10;
}
main()
{
Abc _t; (2 Replies)
Hi All,
I have two ksh script. 1st script calls the 2nd script and the second script calls an 'C' program.
I want 1st script to wait until the 'C' program completes.
I cant able to get the process id for the 'C' program (child process) to make the 1st script to wait for the second... (7 Replies)
Hi,
is there any command to see symbol table info.
will it show where its allocating memory for varibales golbals & locals and code.(i mean the segments).
i read there is a section called read only data segment and this is where initialized data such as strings stores.
i have wriiten the... (7 Replies)
Hey all, I need to launch a script from within 2 other scripts that can run independently of the two parent scripts... Im having a hard time doing this, if anyone knows how please let me know.
More detail.
ScriptA (bash), ScriptB (ksh), ScriptC (bash)
ScriptA, launches ScriptB
ScirptB,... (7 Replies)
!/bin/sh
pid=$(ps -Aj | grep MSTRSvr | grep -v grep | awk '{print $1}')
sid=$(ps -Aj | grep MSTRSvr | grep -v grep | awk '{print $3}')
ps -s "$sid"
I am not able to get the desired output it says process list error
if i use watch ps -s "$sid" it considers only the first session id (5 Replies)
Hello, everyone.
Here's a program:
pid_t pid = fork();
if (0 == pid) // child process
{
execvp ...;
}
I send a signal (such as SIGINT) to the parent process, the child process receive the signal as well as the parent process.
However I don't want to child process to receive the... (7 Replies)
Hi everyone
i am very new to linux , working on bash shell.
I am trying to solve the given problem
1. Create a process and then create children using fork
2. Check the Status of the application for successful running.
3. Kill all the process(threads) except parent and first child... (2 Replies)
Discussion started by: vizz_k
2 Replies
LEARN ABOUT FREEBSD
fork
FORK(2) BSD System Calls Manual FORK(2)NAME
fork -- create a new process
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h>
pid_t
fork(void);
DESCRIPTION
The fork() system call causes creation of a new process. The new process (child process) is an exact copy of the calling process (parent
process) except for the following:
o The child process has a unique process ID.
o The child process has a different parent process ID (i.e., the process ID of the parent process).
o The child process has its own copy of the parent's descriptors. These descriptors reference the same underlying objects, so that,
for instance, file pointers in file objects are shared between the child and the parent, so that an lseek(2) on a descriptor in the
child process can affect a subsequent read(2) or write(2) by the parent. This descriptor copying is also used by the shell to
establish standard input and output for newly created processes as well as to set up pipes.
o The child process' resource utilizations are set to 0; see setrlimit(2).
o All interval timers are cleared; see setitimer(2).
o The child process has only one thread, corresponding to the calling thread in the parent process. If the process has more than one
thread, locks and other resources held by the other threads are not released and therefore only async-signal-safe functions (see
sigaction(2)) are guaranteed to work in the child process until a call to execve(2) or a similar function.
RETURN VALUES
Upon successful completion, fork() returns a value of 0 to the child process and returns the process ID of the child process to the parent
process. Otherwise, a value of -1 is returned to the parent process, no child process is created, and the global variable errno is set to
indicate the error.
ERRORS
The fork() system call will fail and no child process will be created if:
[EAGAIN] The system-imposed limit on the total number of processes under execution would be exceeded. The limit is given by the
sysctl(3) MIB variable KERN_MAXPROC. (The limit is actually ten less than this except for the super user).
[EAGAIN] The user is not the super user, and the system-imposed limit on the total number of processes under execution by a single
user would be exceeded. The limit is given by the sysctl(3) MIB variable KERN_MAXPROCPERUID.
[EAGAIN] The user is not the super user, and the soft resource limit corresponding to the resource argument RLIMIT_NPROC would be
exceeded (see getrlimit(2)).
[ENOMEM] There is insufficient swap space for the new process.
SEE ALSO execve(2), rfork(2), setitimer(2), setrlimit(2), sigaction(2), vfork(2), wait(2)HISTORY
The fork() function appeared in Version 6 AT&T UNIX.
BSD May 31, 2013 BSD
04-23-2019
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