I have an application on Informix 4GL, and I am invoking the shell script from the program, but I need to know if the shell script work fine or not, in order to continue the process.
I know that we can use $? to get the final status but this is on unix command. How can I return a value from the... (3 Replies)
Hi,
Iam calling a C program from a Unix shell script. The (C) program reads encrypted username/password from a text file , decrypts and returns the decrypted string.
Is there any way i can return the decrypted string to Unix shell program.
My shell script uses the output of the program to... (11 Replies)
Hi,
I trying to find the solution for writing the programming in unix by shell programming for sorting thr string in alphabetical order.
I getting diffculty in that ,, so i want to find out the solution for that
Please do needful
Thanks
Bhagyesh (1 Reply)
Can anybody pls look into this script and tell me where I went wrong. After running this script, it is showing like "Trying to overlay current working directory ABORT!!!"
:-(
ARGCNT=$#
if
then
echo "Two parameters are needed for this shell "
echo "Please try again with... (1 Reply)
Hi Folks,
The subject is my question:
Can we pass an array of strings from a Perl Program to a Shell Script?
Please provide some sample code.
Thanks
---------- Post updated at 11:52 PM ---------- Previous update was at 11:43 PM ----------
I got it.
Its here:... (0 Replies)
Found myself stuck on this seemingly trivial issue. I have this script which call other shell files to do their deeds. The shell files in turn call some other programs as well. My problem is that in two of these shell files, the control doesnt return to next command in script unless the Enter key... (2 Replies)
Hi All,
well , i am facing this problem.. i have tried a few sample codes but there isn't any solution . could anyone please give a sample code as of how to do this...
Please see the below details...and read the details carefully.
I have written some code, logic is
1)from... (4 Replies)
Hi All,
My program flow is as below
Windows batch -- > Cygwin batch --> zsh script
There are multiple Cygwin batch scripts that are called from Windows batch file . But when i am executing the first cygwin batch script the control goes to the zsh file and executes and stoping from... (1 Reply)
Hello All,
I have a UNIX script which will prepare anonymous oracle pl/sql block in a temporary file in run time and passes this file to sqlplus as given below.
cat > $v_Input_File 2>>$v_Log << EOF
BEGIN
EXECUTE IMMEDIATE 'ALTER SESSION FORCE PARALLEL DML PARALLEL 16';
EXECUTE... (1 Reply)
Hello All,
I have exactly same issue @vikas_trl had in following link:
https://www.unix.com/shell-programming-and-scripting/259854-control-not-returning-sqlplus-calling-unix-shell-script.html
I wonder if he or somebody else could find the issue's cause or the solution.
Any help would... (4 Replies)
Discussion started by: RicardoQ
4 Replies
LEARN ABOUT NETBSD
xc_broadcast
XCALL(9) BSD Kernel Developer's Manual XCALL(9)NAME
xcall, xc_broadcast, xc_unicast, xc_wait -- cross-call interface
SYNOPSIS
#include <sys/xcall.h>
typedef void (*xcfunc_t)(void *, void *);
uint64_t
xc_broadcast(u_int flags, xcfunc_t func, void *arg1, void *arg2);
uint64_t
xc_unicast(u_int flags, xcfunc_t func, void *arg1, void *arg2, struct cpu_info *ci);
void
xc_wait(uint64_t where);
DESCRIPTION
The machine-independent xcall interface allows any CPU in the system to request that an arbitrary function be executed on any other CPU.
Sometimes it is necessary to modify hardware state that is tied directly to individual CPUs (such as a CPU's local timer), and these updates
can not be done remotely by another CPU. The LWP requesting the update may be unable to guarantee that it will be running on the CPU where
the update must occur, when the update occurs.
Additionally, it is sometimes necessary to modify per-CPU software state from a remote CPU. Where these update operations are so rare or the
access to the per-CPU data so frequent that the cost of using locking or atomic operations to provide coherency is prohibitive, another way
must be found.
Cross calls help to solve these types of problem. However, since this facility is heavyweight, it is expected that it will not be used
often.
xcall provides a mechanism for making ``low priority'' cross calls. The function to be executed runs on the remote CPU within a thread con-
text, and not from a software interrupt, so it can ensure that it is not interrupting other code running on the CPU, and so has exclusive
access to the CPU. Keep in mind that unless disabled, it may cause a kernel preemption.
xcall also provides a mechanism for making ``high priority'' cross calls. The function to be executed runs on the remote CPU within a
IPL_SOFTCLOCK software interrupt context, possibly interrupting other lower-priority code running on the CPU.
NOTES
Functions being called should be relatively lightweight. They may block on locks, but carefully and minimally, to not interfere with other
cross calls in the system.
FUNCTIONS
xc_broadcast(flags, func, arg1, arg2)
Call (*func)(arg1, arg2) on all CPUs in the system. Return a uint64_t ``ticket'' to xc_wait() on for the cross-call to complete.
flags should be XC_HIGHPRI for a "high priority" call, and 0 for a "low priority" call. xc_broadcast() should not be called from
interrupt context.
xc_unicast(flags, func, arg1, arg2, ci)
Like xc_broadcast(), but call (*func)() on only the CPU indicated by ci. xc_unicast() also returns a ``ticket''.
xc_wait(where)
Wait on the ``ticket'' returned by a prior xc_broadcast() or xc_unicast() for the corresponding cross-call to complete. xc_wait()
should be called from a thread context.
CODE REFERENCES
The xcall interface is implemented within the file sys/kern/subr_xcall.c.
SEE ALSO kpreempt(9), percpu(9)HISTORY
The xcall interface first appeared in NetBSD 5.0.
AUTHORS
Andrew Doran <ad@NetBSD.org>
BSD October 24, 2011 BSD