mirror of
https://github.com/jart/cosmopolitan.git
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6f7d0cb1c3
This makes breaking changes to add underscores to many non-standard function names provided by the c library. MODE=tiny is now tinier and we now use smaller locks that are better for tiny apps in this mode. Some headers have been renamed to be in the same folder as the build package, so it'll be easier to know which build dependency is needed. Certain old misguided interfaces have been removed. Intel intrinsics headers are now listed in libc/isystem (but not in the amalgamation) to help further improve open source compatibility. Header complexity has also been reduced. Lastly, more shell scripts are now available.
88 lines
4.4 KiB
C
88 lines
4.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net 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/intrin/strace.internal.h"
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#include "libc/calls/struct/rlimit.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/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_AS` limits the size of the virtual address space. This will
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* work on all platforms. It's emulated on XNU and Windows which means
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* 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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*
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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 (!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_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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