A process can only wait for its children. You can't wait for some random pid. You can loop until the process is no longer running. But then you will not be able to get the exit code. Maybe the process in question could be run by a wrapper which waits for it, obtains the exit code, and write it to a file or something.
That's right.
But what, from my point of view, is a little bit confusing is the "set $F4=$!". I mean, why "set $F4"? I would use simply "F4=$!"...
Continuing with what Perderabo said, perhaps this could help you
Tested in bash.
Dear linuxers,
I have a usb mess storage device.
My OS is rh as3 update2.
Each time I use the command
mount -t vfat /dev/sda1 /mnt/usb
I got the error "the device is not a valid block device".
I found from google that I should install the module sd_mod
I use the command
insmod sd_mod... (2 Replies)
Hi all,
Please look into the following code :
int main()
{
char command;
int pid, ppid;
ppid = getpid(); /* Get the parent pid */
pid = fork(); /* Fork */
if ( pid ==0 )
{
sprintf( command, " gdb a.out %d ", ppid );
printf( "Command line is %s\n", command );
system( command... (3 Replies)
Dear Expert ,
We have L7 , when we power on we see on lcd messages "drive Post E" , According sun Doc SunSolve , there problem picker or Driver , I try move slot to slot successfully, On Lcd panel i can not see load drive (look like any inside tape in drive , but when i am select eject menu,... (0 Replies)
Hi gurus
I don't understand the below messages as what is going on with my storage
Plz kindly suggest what could be the problem
Script started on Tue 12 May 2009 09:22:13 AM GMT
OMP-root-/salil> uptime
9:22am up 19:44, 2 users, load average: 0.10, 0.08, 0.08
OMP-root-/salil> uname -a... (4 Replies)
Hi,
When I try to create a virtual disk in IVM ( integrated Virtual Machine VIO ) I get this message
Problems occurred while processing the data. A summary of all problems for this page are listed below. Additional details for each problem may be located next to the field causing the... (0 Replies)
Hello Everyone,
I am new to shell scripting and also i am very new to AIX machine
I have a question.
I have shell script which contains the follwing
"ps -e |grep $1
echo $2"
i run this schell script by doing this ./startSehllscript 3444 passed with two parameters .
Accroiding my... (4 Replies)
People i have solaris 9 in a sparc platform i`m tryng to conect a stora edge a5100.When i do a format i don't see the disk, later i do a touch /reconfigure reboot and nothing cant anybody help me?
thank you (4 Replies)
Discussion started by: enkei17
4 Replies
LEARN ABOUT PLAN9
wait
WAIT(2) System Calls Manual WAIT(2)NAME
wait - wait for a process to exit
SYNOPSIS
#include <u.h>
#include <libc.h>
int wait(Waitmsg *w)
DESCRIPTION
Wait causes a process to wait for any child process (see fork(2)) to exit. It returns the pid of a child that has exited and fills in w
with more information about the child. W points to a Waitmsg, which has this structure:
typedef
struct Waitmsg
{
char pid[12]; /* of loved one */
char time[3*12]; /* of loved one & descendants */
char msg[ERRLEN];
} Waitmsg;
Pid is the child's process id. The time array contains the time the child and its descendants spent in user code, the time spent in system
calls, and the child's elapsed real time, all in units of milliseconds. All integers in a Waitmsg are formatted as right-justified textual
numbers in 11-byte fields followed by a blank. Msg contains the message that the child specified in exits(2). For a normal exit, msg[0]
is zero, otherwise msg is prefixed by the process name, a blank, the process id, and a colon.
If there are no more children to wait for, wait returns immediately, with return value -1.
SOURCE
/sys/src/libc/9syscall
SEE ALSO fork(2), exits(2), the wait file in proc(3)DIAGNOSTICS
Sets errstr.
WAIT(2)