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setrlimit silently fails #4509
Description
Windows build number:
>ver
Microsoft Windows [Version 10.0.18362.295]
What I'm doing and what's happening:
Use any C compiler to produce binaries for WSL and any POSIX for the following source file:
#include <errno.h>
#include <stdio.h>
#include <sys/resource.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
int main() {
struct rlimit rlp = {1, 4};
if (setrlimit(RLIMIT_NPROC, &rlp) < 0) goto handle;
rlp.rlim_cur = 0;
rlp.rlim_max = 0;
if (getrlimit(RLIMIT_NPROC, &rlp) < 0) goto handle;
printf("Process limits: (%llu, %llu)\n", rlp.rlim_cur, rlp.rlim_max);
if (fork() < 0) goto handle;
printf("Hello 1\n");
if (fork() < 0) goto handle;
printf("Hello 2\n");
if (fork() < 0) goto handle;
printf("Hello 3\n");
return 0;
handle:
perror(NULL);
return 1;
}
What's wrong / what should be happening instead:
The outputs on the two systems differ. Here is the correct output produced on my Ubuntu system:
$ ./a.out
Process limits: (1, 4)
Resource temporarily unavailable
And here is the output from WSL(Ubuntu):
$ ./a.out
Process limits: (1, 4)
Hello 1
Hello 1
Hello 2
Hello 2
Hello 2
Hello 2
Hello 3
Hello 3
Hello 3
Hello 3
Hello 3
Hello 3
Hello 3
Hello 3
setrlimit returns 0 to indicate success, even though the hard process limit isn't being set, which permits all of the forks to successfully execute.
Activity
therealkenc commentedon Sep 16, 2019
Spiritually similar to #3505.
setrlimit(2)on WSL1 is.... limited.