mirror of
https://github.com/jart/cosmopolitan.git
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226aaf3547
This commit makes numerous refinements to cosmopolitan memory handling.
The default stack size has been reduced from 2mb to 128kb. A new macro
is now provided so you can easily reconfigure the stack size to be any
value you want. Work around the breaking change by adding to your main:
STATIC_STACK_SIZE(0x00200000); // 2mb stack
If you're not sure how much stack you need, then you can use:
STATIC_YOINK("stack_usage_logging");
After which you can `sort -nr o/$MODE/stack.log`. Based on the unit test
suite, nothing in the Cosmopolitan repository (except for Python) needs
a stack size greater than 30kb. There are also new macros for detecting
the size and address of the stack at runtime, e.g. GetStackAddr(). We
also now support sigaltstack() so if you want to see nice looking crash
reports whenever a stack overflow happens, you can put this in main():
ShowCrashReports();
Under `make MODE=dbg` and `make MODE=asan` the unit testing framework
will now automatically print backtraces of memory allocations when
things like memory leaks happen. Bugs are now fixed in ASAN global
variable overrun detection. The memtrack and asan runtimes also handle
edge cases now. The new tools helped to identify a few memory leaks,
which are fixed by this change.
This change should fix an issue reported in #288 with ARG_MAX limits.
Fixing this doubled the performance of MKDEPS.COM and AR.COM yet again.
94 lines
4.3 KiB
C
94 lines
4.3 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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│ This is free and unencumbered software released into the public domain. │
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│ │
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│ Anyone is free to copy, modify, publish, use, compile, sell, or │
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│ distribute this software, either in source code form or as a compiled │
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│ binary, for any purpose, commercial or non-commercial, and by any │
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│ means. │
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│ │
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│ In jurisdictions that recognize copyright laws, the author or authors │
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│ of this software dedicate any and all copyright interest in the │
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│ software to the public domain. We make this dedication for the benefit │
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│ of the public at large and to the detriment of our heirs and │
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│ successors. We intend this dedication to be an overt act of │
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│ relinquishment in perpetuity of all present and future rights to this │
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│ software under copyright law. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
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│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
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│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
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│ IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR │
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│ OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, │
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│ ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR │
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│ OTHER DEALINGS IN THE SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/safemacros.internal.h"
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#include "libc/dns/prototxt.h"
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#include "libc/errno.h"
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#include "libc/fmt/conv.h"
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#include "libc/macros.internal.h"
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/**
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* Opens and searches /etc/protocols to find name for a given number.
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*
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* The format of /etc/protocols is like this:
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*
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* # comment
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* # NAME PROTOCOL ALIASES
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* ip 0 IP
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* icmp 1 ICMP
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*
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* @param protonum is the protocol number
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* @param buf is a buffer to store the official name of the protocol
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* @param bufsize is the size of buf
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* @param filepath is the location of the protocols file
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* (if NULL, uses /etc/protocols)
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* @return 0 on success, -1 on error
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* @note aliases are not read from the file.
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*/
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int LookupProtoByNumber(const int protonum, char *buf, size_t bufsize,
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const char *filepath) {
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FILE *f;
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char *line;
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char pathbuf[PATH_MAX];
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const char *path;
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size_t linesize;
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int found;
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char *name, *number, *comment, *tok;
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if (!(path = filepath)) {
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path = "/etc/protocols";
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if (IsWindows()) {
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path =
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firstnonnull(GetNtProtocolsTxtPath(pathbuf, ARRAYLEN(pathbuf)), path);
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}
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}
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if (bufsize == 0 || !(f = fopen(path, "r"))) {
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return -1;
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}
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line = NULL;
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linesize = 0;
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found = 0;
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while (found == 0 && (getline(&line, &linesize, f)) != -1) {
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if ((comment = strchr(line, '#'))) *comment = '\0';
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name = strtok_r(line, " \t\r\n\v", &tok);
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number = strtok_r(NULL, " \t\r\n\v", &tok);
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if (name && number && protonum == atoi(number)) {
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if (!memccpy(buf, name, '\0', bufsize)) {
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strcpy(buf, "");
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break;
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}
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found = 1;
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}
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}
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free(line);
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if (ferror(f)) {
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errno = ferror(f);
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fclose(f);
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return -1;
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}
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fclose(f);
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if (!found) return -1;
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return 0;
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}
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