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adac64a52b
The includes in libc/calls/calls.h have now been refactored so that functions with struct parameters are declared in libc/calls/struct/
86 lines
3.9 KiB
C
86 lines
3.9 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/syscall-sysv.internal.h"
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#include "libc/dce.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/str/str.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() || IsXnu()) {
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// TODO(jart): Does XNU guarantee argv[0] is legit?
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// Otherwise we should return NULL.
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// What about OpenBSD?
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if (strlen(GetProgramExecutableName()) < n) {
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strcpy(p, GetProgramExecutableName());
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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[rc] = 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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