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Userland: Use CFile in dmesg

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This commit is contained in:
Robin Burchell 2019-06-02 12:13:06 +02:00 • committed by Andreas Kling
parent 7de861bdd9
commit decf1afbaa
1 changed files with 7 additions and 18 deletions
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25
Userland/dmesg.cpp
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@ -2,30 +2,19 @@
#include <unistd.h>
#include <fcntl.h>
#include <assert.h>
#include <LibCore/CFile.h>
int main(int argc, char** argv)
{
(void) argc;
(void) argv;
int fd = open("/proc/dmesg", O_RDONLY);
if (fd < 0) {
perror("open /proc/dmesg");
CFile f("/proc/dmesg");
if (!f.open(CIODevice::ReadOnly)) {
fprintf(stderr, "open: failed to open /proc/dmesg: %s", f.error_string());
return 1;
}
for (;;) {
char buffer[BUFSIZ];
ssize_t nread = read(fd, buffer, sizeof(buffer));
if (nread < 0) {
perror("read");
return 1;
}
if (nread == 0) {
break;
}
ssize_t nwritten = write(1, buffer, nread);
assert(nwritten == nread);
}
int rc = close(fd);
assert(rc == 0);
const auto& b = f.read_all();
for (auto i = 0; i < b.size(); ++i)
putchar(b[i]);
return 0;
}