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allow simple-procfs to work with the new procfs api introduced RHEL9 #2

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allow simple-procfs to work with the new procfs api introduced RHEL9 #2

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29092b3
allow simple-procfs to work with the new procfs api introduced in ker…
chr15p May 23, 2022
ec540c9
update makefile for when build doesn't exist
chr15p Feb 22, 2023
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4 changes: 2 additions & 2 deletions Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -10,10 +10,10 @@ KMODVER=$(shell git describe HEAD 2>/dev/null || git rev-parse --short HEAD)
endif

all:
make -C /lib/modules/$(KVER)/build M=$(PWD) EXTRA_CFLAGS=-DKMODVER=\\\"$(KMODVER)\\\" modules
make -C /usr/src/kernels/$(KVER)/ M=$(PWD) EXTRA_CFLAGS=-DKMODVER=\\\"$(KMODVER)\\\" modules
gcc -o spkut ./simple-procfs-kmod-userspace-tool.c
clean:
make -C /lib/modules/$(KVER)/build M=$(PWD) clean
make -C /usr/src/kernels/$(KVER)/ M=$(PWD) clean
rm -f spkut
install:
install -v -m 755 spkut /bin/
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16 changes: 16 additions & 0 deletions simple-procfs-kmod.c
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@
#include <linux/kernel.h>
#include <linux/proc_fs.h>
#include <asm/uaccess.h>
#include <linux/version.h>
#define BUFSIZE 100

#define PROCFS_NAME "simple-procfs-kmod"
Expand Down Expand Up @@ -60,12 +61,27 @@ static ssize_t myread(struct file *file, char __user *ubuf,size_t count, loff_t
return len;
}

// the api for procfs changed with the 5.6 kernel to use the proc_ops struct rather than file_operations
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)
static loff_t proc_lseek(struct file *file, loff_t offset, int i)
{
file->f_pos = offset;
return offset;
}
static struct proc_ops myops =
{
.proc_read = myread,
.proc_write = mywrite,
.proc_lseek = proc_lseek,
};
#else
static struct file_operations myops =
{
.owner = THIS_MODULE,
.read = myread,
.write = mywrite,
};
#endif

static int simple_init(void)
{
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