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os: fix getrlimit/setrlimit test for MIPS

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This test can fail due to a fix in musl for 32 bit MIPS, where musl changes limits greater than -1UL/2 to RLIM_INFINITY.
See http://git.musl-libc.org/cgit/musl/commit/src/misc/getrlimit.c?id=8258014fd1e34e942a549c88c7e022a00445c352

Depending on the system where the test is run getrlimit can return
RLIM_INFINITY for example if RLIMIT_MEMLOCK is bigger than ~2GiB.

If that happens, the setrlimit call will fail with PermissionDenied.
This commit is contained in:
Vincent Rischmann 2021-10-10 15:10:02 +02:00
parent 353c59e6d5
commit d7c770fb7f
1 changed files with 13 additions and 1 deletions
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14
lib/std/os/test.zig
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@ -693,7 +693,19 @@ test "getrlimit and setrlimit" {
inline for (std.meta.fields(os.rlimit_resource)) |field| {
const resource = @intToEnum(os.rlimit_resource, field.value);
const limit = try os.getrlimit(resource);
try os.setrlimit(resource, limit);
// On 32 bit MIPS musl includes a fix which changes limits greater than -1UL/2 to RLIM_INFINITY.
// See http://git.musl-libc.org/cgit/musl/commit/src/misc/getrlimit.c?id=8258014fd1e34e942a549c88c7e022a00445c352
//
// This happens for example if RLIMIT_MEMLOCK is bigger than ~2GiB.
// In that case the following the limit would be RLIM_INFINITY and the following setrlimit fails with EPERM.
if (comptime builtin.cpu.arch.isMIPS() and builtin.link_libc) {
if (limit.cur != os.linux.RLIM.INFINITY) {
try os.setrlimit(resource, limit);
}
} else {
try os.setrlimit(resource, limit);
}
}
}