From: "Marek Behún" <marek.behun@nic.cz>
To: Simon Glass <sjg@chromium.org>
Cc: U-Boot Mailing List <u-boot@lists.denx.de>,
Heinrich Schuchardt <xypron.glpk@gmx.de>,
Patrick Delaunay <patrick.delaunay@foss.st.com>
Subject: Re: [PATCH 09/11] sandbox: Add a way to map a file into memory
Date: Thu, 19 Aug 2021 12:28:20 +0200 [thread overview]
Message-ID: <20210819122820.67b413a9@thinkpad> (raw)
In-Reply-To: <20210818214022.9.Ifb64a64e67b3777340ca034ed6d3a7a02143696c@changeid>
On Wed, 18 Aug 2021 21:40:31 -0600
Simon Glass <sjg@chromium.org> wrote:
> It is useful to map a file into memory so that it can be accessed using
> simple pointers. Add a function to support this.
>
> Signed-off-by: Simon Glass <sjg@chromium.org>
> +int os_map_file(const char *pathname, int os_flags, void **bufp, int *sizep)
> +{
> + void *ptr;
> + int size;
> + int ifd;
> +
> + ifd = os_open(pathname, os_flags);
> + if (ifd < 0) {
> + printf("Cannot open file '%s'\n", pathname);
> + return -EIO;
> + }
> + size = os_filesize(ifd);
> + if (size < 0) {
> + printf("Cannot get file size of '%s'\n", pathname);
> + return -EIO;
> + }
> +
> + ptr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, ifd, 0);
> + if (ptr == MAP_FAILED) {
> + printf("Can't map file '%s': %s\n", pathname, strerror(errno));
> + return -EPERM;
> + }
> +
> + *bufp = ptr;
> + *sizep = size;
> +
> + return 0;
> +}
You need to close the file descriptor after mmapping.
Marek
next prev parent reply other threads:[~2021-08-19 10:28 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-19 3:40 [PATCH 00/11] sandbox: Minor fixes and improvements Simon Glass
2021-08-19 3:40 ` [PATCH 01/11] dtoc: Further improve documentation about warnings Simon Glass
2021-09-23 2:08 ` Tom Rini
2021-08-19 3:40 ` [PATCH 02/11] sandbox: Correct handling of --rm_memory Simon Glass
2021-09-23 2:08 ` Tom Rini
2021-08-19 3:40 ` [PATCH 03/11] sandbox: Add license headers to the dts files Simon Glass
2021-09-23 2:08 ` Tom Rini
2021-08-19 3:40 ` [PATCH 04/11] btrfs: Suppress the message about missing filesystem Simon Glass
2021-08-19 10:31 ` Marek Behún
2021-08-19 10:48 ` Qu Wenruo
2021-09-23 2:08 ` Tom Rini
2021-08-19 3:40 ` [PATCH 05/11] sqfs: " Simon Glass
2021-08-19 7:03 ` Miquel Raynal
2021-09-23 2:08 ` Tom Rini
2021-08-19 3:40 ` [PATCH 06/11] test: Tidy a comment in the bloblist test Simon Glass
2021-09-23 2:08 ` Tom Rini
2021-08-19 3:40 ` [PATCH 07/11] dm: core: Fix a few incorrect comments on first/next functions Simon Glass
2021-09-23 2:09 ` Tom Rini
2021-08-19 3:40 ` [PATCH 08/11] sandbox: Add a way to find the size of a file Simon Glass
2021-08-19 10:27 ` Marek Behún
2021-09-23 2:09 ` Tom Rini
2021-08-19 3:40 ` [PATCH 09/11] sandbox: Add a way to map a file into memory Simon Glass
2021-08-19 10:28 ` Marek Behún [this message]
2021-09-23 2:09 ` Tom Rini
2021-09-24 2:48 ` Simon Glass
2021-08-19 3:40 ` [PATCH 10/11] sandbox: mmc: Support a backing file Simon Glass
2021-08-28 5:15 ` Jaehoon Chung
2021-08-28 6:39 ` Sean Anderson
2021-09-18 9:34 ` Simon Glass
2021-09-16 18:40 ` Tom Rini
2021-09-18 9:34 ` Simon Glass
2021-09-18 13:16 ` Tom Rini
2021-09-18 16:31 ` Simon Glass
2021-09-20 3:18 ` Simon Glass
2021-10-21 20:17 ` Simon Glass
2021-08-19 3:40 ` [PATCH 11/11] test: Add a way to skip console checking until a string matches Simon Glass
2021-09-23 2:09 ` Tom Rini
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