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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/um/kernel/exitcode.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/um/kernel/exitcode.c')
-rw-r--r-- | arch/um/kernel/exitcode.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/arch/um/kernel/exitcode.c b/arch/um/kernel/exitcode.c new file mode 100644 index 000000000..43edc2aa5 --- /dev/null +++ b/arch/um/kernel/exitcode.c @@ -0,0 +1,79 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) + */ + +#include <linux/ctype.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#include <linux/types.h> +#include <linux/uaccess.h> + +/* + * If read and write race, the read will still atomically read a valid + * value. + */ +int uml_exitcode = 0; + +static int exitcode_proc_show(struct seq_file *m, void *v) +{ + int val; + + /* + * Save uml_exitcode in a local so that we don't need to guarantee + * that sprintf accesses it atomically. + */ + val = uml_exitcode; + seq_printf(m, "%d\n", val); + return 0; +} + +static int exitcode_proc_open(struct inode *inode, struct file *file) +{ + return single_open(file, exitcode_proc_show, NULL); +} + +static ssize_t exitcode_proc_write(struct file *file, + const char __user *buffer, size_t count, loff_t *pos) +{ + char *end, buf[sizeof("nnnnn\0")]; + size_t size; + int tmp; + + size = min(count, sizeof(buf)); + if (copy_from_user(buf, buffer, size)) + return -EFAULT; + + tmp = simple_strtol(buf, &end, 0); + if ((*end != '\0') && !isspace(*end)) + return -EINVAL; + + uml_exitcode = tmp; + return count; +} + +static const struct proc_ops exitcode_proc_ops = { + .proc_open = exitcode_proc_open, + .proc_read = seq_read, + .proc_lseek = seq_lseek, + .proc_release = single_release, + .proc_write = exitcode_proc_write, +}; + +static int make_proc_exitcode(void) +{ + struct proc_dir_entry *ent; + + ent = proc_create("exitcode", 0600, NULL, &exitcode_proc_ops); + if (ent == NULL) { + printk(KERN_WARNING "make_proc_exitcode : Failed to register " + "/proc/exitcode\n"); + return 0; + } + return 0; +} + +__initcall(make_proc_exitcode); |