mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-01 03:53:33 +00:00
dc0ea6640e
This change makes further effort towards improving our poll() implementation on the New Technology. The stdin worker didn't work out so well for Python so it's not being used for now. System call tracing with the --strace flag should now be less noisy now on Windows unless you modify the strace.internal.h defines to turn on some optional ones that are most useful for debugging the system call wrappers.
82 lines
3.7 KiB
C
82 lines
3.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2021 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/calls/internal.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/macros.internal.h"
|
|
#include "libc/runtime/runtime.h"
|
|
#include "libc/sysv/consts/at.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
|
|
/**
|
|
* Returns path of executable interperter.
|
|
*
|
|
* Unlike `program_executable_name` which is designed to figure out the
|
|
* absolute path of the first argument passed to `execve()`, what we do
|
|
* here is probe things like `/proc` and `sysctl()` to figure out if we
|
|
* were launched by something like `ape-loader`, and then we return its
|
|
* path. If we can't determine that path, possibly because we're on XNU
|
|
* or OpenBSD, then we return -1 with an error code.
|
|
*
|
|
* @param p receives utf8 output
|
|
* @param n is byte size of res buffer
|
|
* @return p on success or null w/ errno if out of buf or error
|
|
* @see program_invocation_short_name
|
|
* @see program_invocation_name
|
|
* @see program_executable_name
|
|
*/
|
|
char *GetInterpreterExecutableName(char *p, size_t n) {
|
|
int e;
|
|
size_t m;
|
|
int cmd[4];
|
|
ssize_t rc;
|
|
char *r, *t;
|
|
e = errno;
|
|
if (n < 2) {
|
|
errno = ENAMETOOLONG;
|
|
} else if (IsWindows() || IsXnu()) {
|
|
if (strlen(GetProgramExecutableName()) < n) {
|
|
strcpy(p, GetProgramExecutableName());
|
|
return p;
|
|
}
|
|
errno = ENAMETOOLONG;
|
|
} else if ((rc = sys_readlinkat(AT_FDCWD, "/proc/self/exe", p, n - 1)) > 0) {
|
|
p[rc] = 0;
|
|
return p;
|
|
} else if ((rc = sys_readlinkat(AT_FDCWD, "/proc/curproc/file", p, n - 1)) >
|
|
0) {
|
|
errno = e;
|
|
p[n] = 0;
|
|
return p;
|
|
} else if (IsFreebsd() || IsNetbsd()) {
|
|
cmd[0] = 1 /* CTL_KERN */;
|
|
cmd[1] = 14 /* KERN_PROC */;
|
|
if (IsFreebsd()) {
|
|
cmd[2] = 12 /* KERN_PROC_PATHNAME */;
|
|
} else {
|
|
cmd[2] = 5 /* KERN_PROC_PATHNAME */;
|
|
}
|
|
cmd[3] = -1; /* current process */
|
|
if (sysctl(cmd, ARRAYLEN(cmd), p, &n, 0, 0) != -1) {
|
|
errno = e;
|
|
return p;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|