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([2001:a61:253c:8201:b2fb:3ef8:ca:1604]) by smtp.gmail.com with ESMTPSA id c206sm7346680wmf.36.2020.06.19.05.39.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 19 Jun 2020 05:39:55 -0700 (PDT) Cc: mtk.manpages@gmail.com, linux-man@vger.kernel.org Subject: Re: [PATCH v2] fread.3: Add example To: Arkadiusz Drabczyk References: <20200618142232.31022-1-arkadiusz@drabczyk.org> From: "Michael Kerrisk (man-pages)" Message-ID: <1ffd0ea3-824b-26e8-99bc-0b9b85c537e0@gmail.com> Date: Fri, 19 Jun 2020 14:39:52 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <20200618142232.31022-1-arkadiusz@drabczyk.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-man-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-man@vger.kernel.org Hello Arkadiusz, On 6/18/20 4:22 PM, Arkadiusz Drabczyk wrote: > Signed-off-by: Arkadiusz Drabczyk Thanks! Patch applied. One glitch below edited. > --- > man3/fread.3 | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 55 insertions(+) > > diff --git a/man3/fread.3 b/man3/fread.3 > index 2dd7be9..4af3850 100644 > --- a/man3/fread.3 > +++ b/man3/fread.3 > @@ -113,6 +113,61 @@ T} Thread safety MT-Safe > .TE > .SH CONFORMING TO > POSIX.1-2001, POSIX.1-2008, C89. > +.SH EXAMPLES > +The program below demonstrates the use of > +.BR fread () > +by parsing /bin/sh ELF executable in binary mode and printing its > +magic and class: > +.PP > +.in +4n > +.EX > +$ \fB./a.out\fP > +./a.out I removed the preceding line (which did not render, and I assume was cruft you meant to delete). Thanks, Michael > +ELF magic: 0x7f454c46 > +Class: 0x02 > +.EE > +.in > +.SS Program source > +\& > +.EX > +#include > +#include > + > +int > +main(void) > +{ > + FILE *fp = fopen("/bin/sh", "rb"); > + if (!fp) { > + perror("fopen"); > + return EXIT_FAILURE; > + } > + > + unsigned char buffer[4]; > + > + size_t ret = > + fread(buffer, sizeof(buffer) / sizeof(*buffer), sizeof(*buffer), > + fp); > + if (ret != sizeof(*buffer)) { > + fprintf(stderr, "fread() failed: %zu\en", ret); > + exit(EXIT_FAILURE); > + } > + > + printf("ELF magic: %#04x%02x%02x%02x\en", buffer[0], buffer[1], > + buffer[2], buffer[3]); > + > + ret = fread(buffer, 1, 1, fp); > + if (ret != 1) { > + fprintf(stderr, "fread() failed: %zu\en", ret); > + exit(EXIT_FAILURE); > + } > + > + printf("Class: %#04x\en", buffer[0]); > + > + fclose(fp); > + > + exit(EXIT_SUCCESS); > +} > +.EE > .SH SEE ALSO > .BR read (2), > .BR write (2), > -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/