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We pass 'environ' to execve() in arch_avc2_exec(), so that we retain the environment in the current process. But the declaration of 'environ' is a bit weird - it doesn't seem to be in a standard header, requiring a manual explicit declaration. But, we can avoid needing to reference it explicitly by using execv() instead of execve(). This removes a clang warning. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
55 lines
1.2 KiB
C
55 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* PASST - Plug A Simple Socket Transport
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* for qemu/UNIX domain socket mode
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*
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* PASTA - Pack A Subtle Tap Abstraction
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* for network namespace/tap device mode
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*
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* arch.c - Architecture-specific implementations
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*
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* Copyright (c) 2022 Red Hat GmbH
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* Author: Stefano Brivio <sbrivio@redhat.com>
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*/
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "log.h"
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#include "util.h"
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/**
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* arch_avx2_exec() - Switch to AVX2 build if supported
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* @argv: Arguments from command line
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*/
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#ifdef __x86_64__
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void arch_avx2_exec(char **argv)
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{
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char exe[PATH_MAX] = { 0 };
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const char *p;
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if (readlink("/proc/self/exe", exe, PATH_MAX - 1) < 0)
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die_perror("Failed to read own /proc/self/exe link");
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p = strstr(exe, ".avx2");
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if (p && strlen(p) == strlen(".avx2"))
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return;
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if (__builtin_cpu_supports("avx2")) {
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char new_path[PATH_MAX + sizeof(".avx2")];
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if (snprintf_check(new_path, PATH_MAX + sizeof(".avx2"),
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"%s.avx2", exe))
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die_perror("Can't build AVX2 executable path");
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execv(new_path, argv);
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warn_perror("Can't run AVX2 build, using non-AVX2 version");
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}
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}
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#else
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void arch_avx2_exec(char **argv) { (void)argv; }
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#endif
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