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From 0db1f9965e6791c651d0bccd095cbe3a87c6579c Mon Sep 17 00:00:00 2001
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From: Karel Zak <kzak@redhat.com>
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Date: Thu, 25 Nov 2021 11:52:46 +0100
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Subject: [PATCH 70/74] lib/sys: add sysfs_chrdev_devno_to_devname()
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Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=2026511
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Upstream: http://github.com/util-linux/util-linux/commit/ab5304a7a34bfa45d9bee205ca4e26f03db6e79d
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Signed-off-by: Karel Zak <kzak@redhat.com>
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---
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include/pathnames.h | 1 +
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include/sysfs.h | 2 ++
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lib/sysfs.c | 33 +++++++++++++++++++++++++++++++++
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3 files changed, 36 insertions(+)
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diff --git a/include/pathnames.h b/include/pathnames.h
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index 59cc66736..77f8b6e85 100644
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--- a/include/pathnames.h
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+++ b/include/pathnames.h
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@@ -102,6 +102,7 @@
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#define _PATH_SYS_BLOCK "/sys/block"
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#define _PATH_SYS_DEVBLOCK "/sys/dev/block"
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+#define _PATH_SYS_DEVCHAR "/sys/dev/char"
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#define _PATH_SYS_CLASS "/sys/class"
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#define _PATH_SYS_SCSI "/sys/bus/scsi"
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diff --git a/include/sysfs.h b/include/sysfs.h
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index 9a72a2009..e2fd0c1ba 100644
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--- a/include/sysfs.h
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+++ b/include/sysfs.h
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@@ -92,6 +92,8 @@ extern int sysfs_scsi_host_is(struct sysfs_cxt *cxt, const char *type);
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extern int sysfs_scsi_has_attribute(struct sysfs_cxt *cxt, const char *attr);
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extern int sysfs_scsi_path_contains(struct sysfs_cxt *cxt, const char *pattern);
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+extern char *sysfs_chrdev_devno_to_devname(dev_t devno, char *buf, size_t bufsiz);
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+
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/**
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* sysfs_devname_sys_to_dev:
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* @name: devname to be converted in place
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diff --git a/lib/sysfs.c b/lib/sysfs.c
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index e5437f43a..ceec41d10 100644
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--- a/lib/sysfs.c
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+++ b/lib/sysfs.c
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@@ -1036,6 +1036,39 @@ int sysfs_scsi_path_contains(struct sysfs_cxt *cxt, const char *pattern)
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return strstr(linkc, pattern) != NULL;
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}
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+char *sysfs_chrdev_devno_to_devname(dev_t devno, char *buf, size_t bufsiz)
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+{
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+ char link[PATH_MAX];
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+ char path[PATH_MAX];
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+ char *name;
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+ ssize_t sz;
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+
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+ sz = snprintf(path, sizeof(path),
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+ _PATH_SYS_DEVCHAR "/%u:%u", major(devno), minor(devno));
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+ if (sz <= 0)
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+ return NULL;
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+
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+ /* read /sys/dev/char/<maj:min> link */
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+ sz = readlink(path, link, sizeof(link) - 1);
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+ if (sz < 0)
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+ return NULL;
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+ link[sz] = '\0';
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+
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+ name = strrchr(link, '/');
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+ if (!name)
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+ return NULL;
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+
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+ name++;
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+ sz = strlen(name);
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+ if ((size_t) sz + 1 > bufsiz)
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+ return NULL;
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+
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+ memcpy(buf, name, sz + 1);
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+ sysfs_devname_sys_to_dev(buf);
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+ return buf;
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+
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+}
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+
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#ifdef TEST_PROGRAM_SYSFS
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#include <errno.h>
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#include <err.h>
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--
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2.31.1
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