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Create a fake syscall() function due to Python

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Justine Tunney 2023-06-09 05:18:38 -07:00
parent 4b2023ffab
commit 2eb7148474
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8 changed files with 74 additions and 8 deletions
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libc/stdio/syscall.c Normal file
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/*-*- 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 2023 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/stdio/syscall.h"
#include "libc/calls/calls.h"
#include "libc/errno.h"
#include "libc/stdio/rand.h"
/**
* Translation layer for some Linux system calls:
*
* - `SYS_gettid`
* - `SYS_getrandom`
*
* @return negative errno on error
*/
long syscall(long number, ...) {
switch (number) {
default:
return -ENOSYS;
case SYS_gettid:
return gettid();
case SYS_getrandom: {
va_list va;
va_start(va, number);
void *buf = va_arg(va, void *);
size_t buflen = va_arg(va, size_t);
unsigned flags = va_arg(va, unsigned);
va_end(va);
ssize_t rc = getrandom(buf, buflen, flags);
return rc == -1 ? -errno : rc;
}
}
}