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49 lines
2.4 KiB
ArmAsm
49 lines
2.4 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 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/dce.h"
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#include "libc/macros.h"
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/ Forks process without copying page tables.
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/
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/ This is the same as fork() except it's optimized for the case
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/ where the caller invokes exec() immediately afterwards.
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/
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/ @return pid of child process or 0 if forked process
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/ @returnstwice
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vfork: testb IsWindows()
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jnz fork$nt
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mov __NR_vfork(%rip),%eax
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cmp $-1,%eax
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je systemfive.enosys
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pop %rsi
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testb IsBsd()
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jnz vfork.bsd
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syscall
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push %rsi
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cmp $-4095,%rax
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jae systemfive.error
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ret
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.endfn vfork,globl
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vfork.bsd:
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syscall
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push %rsi
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jc systemfive.errno
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ret
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.endfn vfork.bsd
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