mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
b45d50b690
- Fix build flakes - Polyfill SIGWINCH on Windows - Fix an execve issue on Windows - Make strerror show more information - Improve cmd.exe setup/teardown on Windows - Support bracketed paste mode in Blinkenlights - Show keyboard shortcuts in Blinkenlights status bar - Fixed copy_file_range() and copyfile() w/ zip filesystem - Size optimize GetDosArgv() to keep life.com 12kb in size - Improve Blinkenlights ability to load weird ELF executables - Fix program_executable_name and add GetInterpreterExecutableName - Make Python in tiny mode fail better if docstrings are requested - Update Python test exclusions in tiny* modes such as tinylinux - Add bulletproof unbreakable kprintf() troubleshooting function - Remove "oldskool" keyword from ape.S for virus scanners - Fix issue that caused backtraces to not print sometimes - Improve Blinkenlights serial uart character i/o - Make clock_gettime() not clobber errno on xnu - Improve sha256 cpuid check for old computers - Integrate some bestline linenoise fixes - Show runit process names better in htop - Remove SIGPIPE from ShowCrashReports() - Make realpath() not clobber errno - Avoid attaching GDB on non-Linux - Improve img.com example
83 lines
3.7 KiB
C
83 lines
3.7 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 2021 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/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/kprintf.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/sysv/consts/at.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Returns path of executable interperter.
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*
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* Unlike `program_executable_name` which is designed to figure out the
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* absolute path of the first argument passed to `execve()`, what we do
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* here is probe things like `/proc` and `sysctl()` to figure out if we
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* were launched by something like `ape-loader`, and then we return its
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* path. If we can't determine that path, possibly because we're on XNU
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* or OpenBSD, then we return -1 with an error code.
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*
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* @param p receives utf8 output
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* @param n is byte size of res buffer
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* @return p on success or null w/ errno if out of buf or error
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* @see program_invocation_short_name
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* @see program_invocation_name
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* @see program_executable_name
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*/
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char *GetInterpreterExecutableName(char *p, size_t n) {
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int e;
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size_t m;
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int cmd[4];
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ssize_t rc;
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char *r, *t;
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e = errno;
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if (n < 2) {
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errno = ENAMETOOLONG;
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} else if (IsWindows()) {
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if (strlen(program_executable_name) < n) {
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strcpy(p, program_executable_name);
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return p;
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}
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errno = ENAMETOOLONG;
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} else if ((rc = sys_readlinkat(AT_FDCWD, "/proc/self/exe", p, n - 1)) > 0) {
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p[rc] = 0;
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return p;
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} else if ((rc = sys_readlinkat(AT_FDCWD, "/proc/curproc/file", p, n - 1)) >
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0) {
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errno = e;
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p[n] = 0;
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return p;
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} else if (IsFreebsd() || IsNetbsd()) {
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cmd[0] = 1 /* CTL_KERN */;
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cmd[1] = 14 /* KERN_PROC */;
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if (IsFreebsd()) {
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cmd[2] = 12 /* KERN_PROC_PATHNAME */;
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} else {
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cmd[2] = 5 /* KERN_PROC_PATHNAME */;
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}
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cmd[3] = -1; /* current process */
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if (sysctl(cmd, ARRAYLEN(cmd), p, &n, 0, 0) != -1) {
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errno = e;
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return p;
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}
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}
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return 0;
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}
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