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Semantics of sem_getvalue() in POSIX


Semantics of sem_getvalue() in POSIX

By : Angela Marcela Gutie
Date : October 19 2020, 06:10 PM
help you fix your problem The question is inherently racy, and the sem_getvalue function, even if it returns a useful indication of the number of waiters, cannot provide any guarantee that the count is still correct when it returns and you use the resulting value. This sounds like an XY problem, so you should probably explain better what you imagine being able to achieve by having such a count.
code :


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TCP and POSIX sockets accept() semantics

TCP and POSIX sockets accept() semantics


By : yorkedork
Date : March 29 2020, 07:55 AM
With these it helps The call to accept() blocks until it has a connection. Unless and until the 3-way handshake completes there is no connection, so accept() should not return. For non-blocking sockets it won't block, but neither will it give you info about partially completed handshakes.
More TCP and POSIX sockets listen() and accept() semantics

More TCP and POSIX sockets listen() and accept() semantics


By : Dominik
Date : March 29 2020, 07:55 AM
hop of those help? Well, what you're describing here is a typical syn-flood attack ( http://en.wikipedia.org/wiki/SYN_flood ) when executed more than once.
When looking for example at: http://lkml.indiana.edu/hypermail/linux/kernel/0307.0/1258.html there are two seperate queues, one syn queue and one established queue. Apparently it the first connection will remain in the syn queue (since it's in the SYN_RCVD state), the second connection will be in the established queue where the accept() will get it from. A netstat should still show the first in the SYN_RCVD state.
S_IRUSR semantics in POSIX

S_IRUSR semantics in POSIX


By : Chris De La O
Date : March 29 2020, 07:55 AM
may help you . The leading S_ is just to identify what structure/function the constant goes with.
From , the constants S_IRUSR, S_IWUSR, etc are possible values for the st_mode member for struct stat (used in stat() and friends). All the members of struct stat start with the prefix st_, and there are several stat-related macros that also start with S_. The convention is merely there to make matching structure names, member names, and constants easier.
sem_getvalue() dysfunctionality in Mac OS X - C++

sem_getvalue() dysfunctionality in Mac OS X - C++


By : Adam
Date : March 29 2020, 07:55 AM
With these it helps I think you are asking, "how can I work around the absence of sem_getvalue() on OS X?"
I can think of three approaches:
What shell implements POSIX semantics for the variable PS1?

What shell implements POSIX semantics for the variable PS1?


By : user2572274
Date : March 29 2020, 07:55 AM
it fixes the issue bash implements this if you set the POSIXLY_CORRECT environment variable or invoke bash with the --posix option:
code :
PS1='!$ ' POSIXLY_CORRECT=1 bash
2$ echo foo
foo
3$ !2
echo foo
foo
3$ 
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