92a22fef93
perror() prints directly to standard error, but in many cases standard error might be already closed, or we might want to skip logging, based on configuration. Our logging functions provide all that. While at it, make errors more descriptive, replacing some of the existing basic perror-style messages. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
50 lines
1.2 KiB
C
50 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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/**
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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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snprintf(new_path, PATH_MAX + sizeof(".avx2"), "%s.avx2", exe);
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execve(new_path, argv, environ);
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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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