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Userland: Use CFile inside sysctl

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Also add a StringView overload to CIODevice::write
This commit is contained in:
Robin Burchell 2019-06-02 12:05:06 +02:00 committed by Andreas Kling
parent 092f06a719
commit e74b5975e4
Notes: sideshowbarker 2024-07-19 13:47:01 +09:00 
Author: https://github.com/rburchell
Commit: https://github.com/SerenityOS/serenity/commit/e74b5975e4c
Pull-request: https://github.com/SerenityOS/serenity/pull/167
2 changed files with 18 additions and 34 deletions
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2
LibCore/CIODevice.h
View file

@ -1,6 +1,7 @@
#pragma once
#include <AK/ByteBuffer.h>
#include <AK/StringView.h>
#include <LibCore/CObject.h>
class CIODevice : public CObject {
@ -32,6 +33,7 @@ public:
ByteBuffer read_all();
bool write(const byte*, int size);
bool write(const AK::StringView& v) { return write((const byte*)v.characters(), v.length()); }
// FIXME: I would like this to be const but currently it needs to call populate_read_buffer().
bool can_read_line();

50
Userland/sysctl.cpp
View file

@ -9,6 +9,7 @@
#include <AK/Vector.h>
#include <LibCore/CArgsParser.h>
#include <LibCore/CDirIterator.h>
#include <LibCore/CFile.h>
static String read_var(const String& name)
{
@ -16,19 +17,17 @@ static String read_var(const String& name)
builder.append("/proc/sys/");
builder.append(name);
auto path = builder.to_string();
int fd = open(path.characters(), O_RDONLY);
if (fd < 0) {
perror("open");
CFile f(path);
if (!f.open(CIODevice::ReadOnly)) {
fprintf(stderr, "open: %s", f.error_string());
exit(1);
}
char buffer[1024];
int nread = read(fd, buffer, sizeof(buffer));
close(fd);
if (nread < 0) {
perror("read");
const auto& b = f.read_all();
if (f.error() < 0) {
fprintf(stderr, "read: %s", f.error_string());
exit(1);
}
return String(buffer, nread, Chomp);
return String((const char*)b.pointer(), b.size(), Chomp);
}
static void write_var(const String& name, const String& value)
@ -37,17 +36,16 @@ static void write_var(const String& name, const String& value)
builder.append("/proc/sys/");
builder.append(name);
auto path = builder.to_string();
int fd = open(path.characters(), O_WRONLY);
if (fd < 0) {
perror("open");
CFile f(path);
if (!f.open(CIODevice::WriteOnly)) {
fprintf(stderr, "open: %s", f.error_string());
exit(1);
}
int nwritten = write(fd, value.characters(), value.length());
if (nwritten < 0) {
perror("read");
f.write(value.view());
if (f.error() < 0) {
fprintf(stderr, "write: %s", f.error_string());
exit(1);
}
close(fd);
}
@ -61,24 +59,8 @@ static int handle_show_all()
char pathbuf[PATH_MAX];
while (di.has_next()) {
String name = di.next_path();
sprintf(pathbuf, "/proc/sys/%s", name.characters());
int fd = open(pathbuf, O_RDONLY);
if (fd < 0) {
perror("open");
continue;
}
char buffer[1024];
int nread = read(fd, buffer, sizeof(buffer));
close(fd);
if (nread < 0) {
perror("read");
continue;
}
buffer[nread] = '\0';
printf("%s = %s", name.characters(), buffer);
if (nread && buffer[nread - 1] != '\n')
printf("\n");
String variable_name = di.next_path();
printf("%s = %s\n", variable_name.characters(), read_var(variable_name).characters());
}
return 0;
}