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[83.52.55.163]) by smtp.gmail.com with ESMTPSA id o34sm10205228wms.10.2021.08.26.21.48.06 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 26 Aug 2021 21:48:06 -0700 (PDT) Subject: Re: [PATCH v2 42/43] bsd-user: Add '-0 argv0' option to bsd-user/main.c To: imp@bsdimp.com, qemu-devel@nongnu.org References: <20210826211201.98877-1-imp@bsdimp.com> <20210826211201.98877-43-imp@bsdimp.com> From: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= Message-ID: Date: Fri, 27 Aug 2021 06:48:05 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <20210826211201.98877-43-imp@bsdimp.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2a00:1450:4864:20::42b; envelope-from=philippe.mathieu.daude@gmail.com; helo=mail-wr1-x42b.google.com X-Spam_score_int: -34 X-Spam_score: -3.5 X-Spam_bar: --- X-Spam_report: (-3.5 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.248, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, NICE_REPLY_A=-2.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Colin Percival , Richard Henderson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 8/26/21 11:12 PM, imp@bsdimp.com wrote: > From: Colin Percival > > Previously it was impossible to emulate a program with a file name > different from its argv[0]. With this change, you can run > qemu -0 fakename realname args > which runs the program "realname" with an argv of "fakename args". > > Signed-off-by: Colin Percival > Signed-off-by: Warner Losh > Reviewed-by: Richard Henderson > --- > bsd-user/main.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/bsd-user/main.c b/bsd-user/main.c > index b35bcf4d1e..ae25f4c773 100644 > --- a/bsd-user/main.c > +++ b/bsd-user/main.c > @@ -268,6 +268,7 @@ int main(int argc, char **argv) > char **target_environ, **wrk; > envlist_t *envlist = NULL; > bsd_type = HOST_DEFAULT_BSD_TYPE; > + char * argv0 = NULL; > > adjust_ssize(); > > @@ -390,6 +391,8 @@ int main(int argc, char **argv) > do_strace = 1; > } else if (!strcmp(r, "trace")) { > trace_opt_parse(optarg); > + } else if (!strcmp(r, "0")) { > + argv0 = argv[optind++]; > } else { > usage(); > } > @@ -413,6 +416,8 @@ int main(int argc, char **argv) > usage(); > } > filename = argv[optind]; > + if (argv0) Style: { > + argv[optind] = argv0; } > > if (!trace_init_backends()) { > exit(1); >