On 2021-02-12 11:56, Brian Inglis wrote:
On 2021-02-12 02:12, Corinna Vinschen via Cygwin wrote:
On Feb 12 00:26, Brian Inglis wrote:
On 2021-02-11 19:06, Ken Brown via Cygwin wrote:
On 2/11/2021 10:23 AM, Patrick Chkoreff wrote:
I'm trying to use setrlimit to impose limits on various resources such
as CPU time and memory. The call to setrlimit always fails. I've
distilled this into the following example test.c:
if (setrlimit(RLIMIT_CPU,&rlim) < 0)
setrlimit: Invalid argument
Cygwin's setrlimit only supports a few resources, as you can see in the source:
https://cygwin.com/git/?p=newlib-cygwin.git;a=blob;f=winsup/cygwin/resource.cc;h=97777e9d223466b7635b990d6c9e0bfb9e2e9a46;hb=HEAD#l201
In that case could I suggest:
/usr/share/doc/cygwin-doc/html/cygwin-api/compatibility.html#std-susv4
https://cygwin.com/cygwin-api/compatibility.html#std-susv4
in https://cygwin.com/git/?p=newlib-cygwin.git;a=blob;f=winsup/doc/posix.xml
get/setrlimit entries should be annotated with:
https://cygwin.com/acronyms/#PGA
I'll see what I can do. Does anyone know if <ulink> is supported within
<screen>? I seem to remember struggles updating proc(5) in specialnames.xml.
It appears that code using other than the common POSIX resources need existence
checks.
I am unsure if it is worth adding definitions for any others.
It may be possible to implement RSS, NPROC, LOCKS, NICE, but
https://cygwin.com/acronyms/#SHTDI
Comparing Cygwin and Linux ([uapi/]asm-generic/}:
#define RLIMIT_CPU 0 /* CPU time in seconds */
#define RLIMIT_FSIZE 1 /* Maximum filesize */
#define RLIMIT_DATA 2 /* max data size */
#define RLIMIT_STACK 3 /* max stack size */
#define RLIMIT_CORE 4 /* max core file size */
#ifdef LINUX
#define RLIMIT_RSS 5 /* max resident set size */
#define RLIMIT_NPROC 6 /* max number of processes */
#define RLIMIT_NOFILE 7 /* max number of open files */
#define RLIMIT_MEMLOCK 8 /* max locked-in-memory address space */
#define RLIMIT_AS 9 /* address space limit */
#else
#define RLIMIT_NOFILE 5 /* max number of open files */
#define RLIMIT_OFILE RLIMIT_NOFILE /* BSD name */
#define RLIMIT_AS 6 /* address space limit */
#endif
#ifdef LINUX
#define RLIMIT_LOCKS 10 /* maximum file locks held */
#define RLIMIT_SIGPENDING 11 /* max number of pending signals */
#define RLIMIT_MSGQUEUE 12 /* maximum bytes in POSIX mqueues */
#define RLIMIT_NICE 13 /* max nice prio allowed to raise to */
#define RLIMIT_RTPRIO 14 /* maximum realtime priority */
#define RLIMIT_RTTIME 15 /* timeout for RT tasks in us */
#define RLIM_NLIMITS 16
#else
#define RLIMIT_NLIMITS 7 /* upper bound of RLIMIT_* defines */
#endif
Linux man says:
"RLIMIT_MEMLOCK and RLIMIT_NPROC derive from BSD and are not specified in
POSIX.1; they are present on the BSDs and Linux, but on few other implementations.
RLIMIT_RSS derives from BSD and is not specified in POSIX.1; it is nevertheless
present on most implementations.
RLIMIT_MSGQUEUE, RLIMIT_NICE, RLIMIT_RTPRIO, RLIMIT_RTTIME, and
RLIMIT_SIGPENDING are Linux-specific."
--
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada
This email may be disturbing to some readers as it contains
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