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e16a7d8f3b
`et` means `expandtab`. ```sh rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\) :vi/vi: \1 xoet\2:vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2 :vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/' ```
107 lines
5.2 KiB
C
107 lines
5.2 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/assert.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/rlimit.internal.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/intrin/describeflags.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/macros.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/syslib.internal.h"
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#include "libc/sysv/consts/rlimit.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Sets resource limit for current process.
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*
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* The following resources are recommended:
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*
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* - `RLIMIT_STACK` controls how much stack memory is available to the
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* main thread. This setting is inherited across fork() and execve()
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* Please note it's only safe for Cosmopolitan programs, to set this
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* value to at least `PTHREAD_STACK_MIN * 2`. On Windows this cannot
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* be used to extend the stack, which is currently hard-coded.
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*
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* - `RLIMIT_AS` limits the size of the virtual address space. This will
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* work on all platforms except WSL. It is emulated on XNU and Windows
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* which means it won't propagate across execve() currently.
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*
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* - `RLIMIT_CPU` causes `SIGXCPU` to be sent to the process when the
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* soft limit on CPU time is exceeded, and the process is destroyed
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* when the hard limit is exceeded. It works everywhere but Windows
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* where it should be possible to poll getrusage() with setitimer()
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*
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* - `RLIMIT_FSIZE` causes `SIGXFSZ` to sent to the process when the
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* soft limit on file size is exceeded and the process is destroyed
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* when the hard limit is exceeded. It works everywhere but Windows
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* and it also causes `EFBIG` to be returned by i/o functions after
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* the `SIGXFSZ` signal is delivered or ignored
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*
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* - `RLIMIT_NPROC` limits the number of simultaneous processes and it
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* should work on all platforms except Windows. Please be advised it
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* limits the process, with respect to the activities of the user id
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* as a whole.
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*
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* - `RLIMIT_NOFILE` limits the number of open file descriptors and it
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* should work on all platforms except Windows (TODO)
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*
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* The rlimit magnums differ for each platform but occupy the interval
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* zero through `RLIM_NLIMITS`. Usually they're set to `RLIM_INFINITY`
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* which is `-1` on Linux/Windows, and `LONG_MAX` on BSDs. In any case
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* they're both very large numbers under the Cosmopolitan unsigned ABI
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* because struct rlimit uses uint64_t. The special magnum 127 is used
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* for constant values that aren't supported by the host platform.
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*
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* @param rlim specifies new resource limit
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* @return 0 on success or -1 w/ errno
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* @see libc/sysv/consts.sh
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* @vforksafe
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*/
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int setrlimit(int resource, const struct rlimit *rlim) {
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int rc;
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if (resource == 127) {
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rc = einval();
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} else if (!rlim || (IsAsan() && !__asan_is_valid(rlim, sizeof(*rlim)))) {
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rc = efault();
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} else if (IsXnuSilicon()) {
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rc = _sysret(__syslib->__setrlimit(resource, rlim));
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} else if (!IsWindows()) {
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rc = sys_setrlimit(resource, rlim);
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if (IsXnu() && !rc && resource == RLIMIT_AS) {
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// TODO(jart): What's up with XNU and NetBSD?
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__virtualmax = rlim->rlim_cur;
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}
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} else if (resource == RLIMIT_STACK) {
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rc = enotsup();
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} else if (resource == RLIMIT_AS) {
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__virtualmax = rlim->rlim_cur;
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rc = 0;
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} else {
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rc = einval();
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}
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STRACE("setrlimit(%s, %s) → %d% m", DescribeRlimitName(resource),
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DescribeRlimit(0, rlim), rc);
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return rc;
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}
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__weak_reference(setrlimit, setrlimit64);
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