mirror of
https://github.com/jart/cosmopolitan.git
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76 lines
3.1 KiB
C
76 lines
3.1 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 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/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/runtime/syslib.internal.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/sysv/errfuns.h"
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int sys_fork(void) {
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#ifdef __x86_64__
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axdx_t ad;
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int ax, dx;
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ad = __sys_fork();
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ax = ad.ax;
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dx = ad.dx;
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if (IsXnu() && ax != -1) {
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// eax always returned with childs pid
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// edx is 0 for parent and 1 for child
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ax &= dx - 1;
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}
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return ax;
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#elif defined(__aarch64__)
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if (IsLinux()) {
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int flags = 17; // SIGCHLD
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void *child_stack = 0;
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void *parent_tidptr = 0;
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void *newtls = 0;
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void *child_tidptr = 0;
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register long r0 asm("x0") = (long)flags;
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register long r1 asm("x1") = (long)child_stack;
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register long r2 asm("x2") = (long)parent_tidptr;
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register long r3 asm("x3") = (long)newtls;
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register long r4 asm("x4") = (long)child_tidptr;
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register int res_x0 asm("x0");
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asm volatile("mov\tx8,%1\n\t"
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"svc\t0"
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: "=r"(res_x0)
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: "i"(220), "r"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4)
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: "x8", "x16", "memory");
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return _sysret(res_x0);
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} else if (__syslib) {
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return _sysret(__syslib->__fork());
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} else {
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int ax;
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axdx_t ad;
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ad = __sys_fork();
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ax = ad.ax;
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return ax;
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}
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#else
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return enosys();
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#endif
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}
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