Subprocess.popen() should write to log without waiting for process to complete
Here is my test code
I am trying with bufsize=0 or 1 to get near to real-time output in the logs. What I have to do? process.communicate() has to go right?
how to know the information of the waiting process
how to calculate the time of the process that it has taken to execute
i want to make a program that Should be able to keep a log of the processes expired(The log should contain the starting time, expiry time, time slices used, total execution... (2 Replies)
hi,
how to work with a background process without a controlling terminal to make use of popen or system call ?
when ever i use popen or system function call in foreground process, there is no problem with respect to that .. but when the same program is run as a background process without a... (7 Replies)
Hello Experts!!
My CPU is waiting a lot (around 33%) on I/O. I would like to find out what process(s) are waiting on the i/o. Below is my real time output of vmstat and sar.
Thanks for you help !!!!
Regards
Citrus
OS: AIX - 5L
: /u2/oracle >oslevel
5.3.0.0
: /u2/oracle... (9 Replies)
Hi,
I am calling a program that greps and returns 72536 bytes of data on STDOUT, say about 7000 lines of data on STDOUT.
I use pipe from the program am calling the above program. Naturally, I execute the above program (through execl() ) throught the child process and try to read the... (4 Replies)
Received the Timed out message consistently when I tried to jumpstart an M5000 with:
boot jsnet:speed=1000,duplex=full - install
Made the error go away by adding link-clock parameter:
boot jsnet:speed=1000,duplex=full,link-clock=master - install
"link-clock=master" disables... (1 Reply)
If we have 3 process to write to same log file at the same time like below. will it cause the data outdated because the multiple process writing same time? It this a safe way to keep the log for multiple process?
p1 >> test.log &;
p2 >> test.log &;
p3 >> test.log &
Thanks, (5 Replies)
I'm not sure if this is the right place to post this issue...but here goes...
I am converting a set of windows jobs from Control-M to AutoSys r11.3. The same command line is being executed in both systems. The Control-M job runs to compltion in about 1.5 hours, waiting for the entire batch... (3 Replies)
Hi,
I need to initiate a process script which will start and do some processing and then shuts down. Then i need to other verifications. But the the process takes around 25 to 3o minutes.
One thing i can monitor the nohup.out file for this process where i can wait for shutting down statement to... (3 Replies)
Discussion started by: Prashanth19
3 Replies
LEARN ABOUT BSD
pclose
POPEN(3) Library Functions Manual POPEN(3)NAME
popen, pclose - initiate I/O to/from a process
SYNOPSIS
#include <stdio.h>
FILE *popen(command, type)
char *command, *type;
pclose(stream)
FILE *stream;
DESCRIPTION
The arguments to popen are pointers to null-terminated strings containing respectively a shell command line and an I/O mode, either "r" for
reading or "w" for writing. It creates a pipe between the calling process and the command to be executed. The value returned is a stream
pointer that can be used (as appropriate) to write to the standard input of the command or read from its standard output.
A stream opened by popen should be closed by pclose, which waits for the associated process to terminate and returns the exit status of the
command.
Because open files are shared, a type "r" command may be used as an input filter, and a type "w" as an output filter.
SEE ALSO pipe(2), fopen(3S), fclose(3S), system(3), wait(2), sh(1)DIAGNOSTICS
Popen returns a null pointer if files or processes cannot be created, or the shell cannot be accessed.
Pclose returns -1 if stream is not associated with a `popened' command.
BUGS
Buffered reading before opening an input filter may leave the standard input of that filter mispositioned. Similar problems with an output
filter may be forestalled by careful buffer flushing, for instance, with fflush, see fclose(3S).
Popen always calls sh, never calls csh.
7th Edition May 15, 1985 POPEN(3)