Hello
I need to do this:
1 opening a file for writing/appending
2 to lock the file as for writing (i mean: the program
that lock can keep writing, all others programs can't )
3 wtite and close/unlock
Even better would be changing the order of steps 1 and 2 (that
is,first locking than writing, but it seems to me that in order to block
i need the id of the file...)
Untill now i have tried to do smthing like :
import fcntl
f=open("prova.txt", 'w')
fcntl.flock(f.fileno(),fcntl.LOCK_EX)
f.write("aaa")
#meanwhile i open prova.txt with an editor in another window
#and write in "bbb" (without getting any error/warning)and then follow
#in the python shell with
f.close()
But then opening the file i can see "bbb" instead of "aaa"
I'm wandering, am i completely lost(misled?)Am i waiting for fcntl to do
what it doesn't?
I have tried too with:
f1=os.open('prova.txt',os.O_EXCL|os.O_APPEND)
os.write(f1,"qlcosa")
that should solve the problem of the order of the step, but i not even
can write from the python shell with that.
python 2.2
linux
kernel 2.4
glibc-2.3.2-95.6
Thanks in advance for any help.
sorry for my bad english
Grazie
Marcello
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