banan-os/userspace/programs/meminfo/main.cpp

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#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/banan-os.h>
bool is_only_digits(const char* str)
{
while (*str)
if (!isdigit(*str++))
return false;
return true;
}
int main()
{
DIR* proc = opendir("/proc");
if (proc == nullptr)
{
perror("opendir");
return 1;
}
char path_buffer[128] {};
while (dirent* proc_ent = readdir(proc))
{
if (proc_ent->d_type != DT_DIR)
continue;
if (!is_only_digits(proc_ent->d_name))
continue;
{
strcpy(path_buffer, proc_ent->d_name);
strcat(path_buffer, "/cmdline");
int fd = openat(dirfd(proc), path_buffer, O_RDONLY);
if (fd == -1)
{
if (errno != EACCES)
perror("openat");
continue;
}
printf("process: ");
while (ssize_t nread = read(fd, path_buffer, sizeof(path_buffer) - 1))
{
if (nread < 0)
{
perror("read");
break;
}
for (int i = 0; i < nread; i++)
if (path_buffer[i] == '\0')
path_buffer[i] = ' ';
path_buffer[nread] = '\0';
int written = 0;
while (written < nread)
written += printf("%s ", path_buffer + written);
}
printf("\n");
close(fd);
}
printf(" pid: %s\n", proc_ent->d_name);
{
strcpy(path_buffer, proc_ent->d_name);
strcat(path_buffer, "/meminfo");
int fd = openat(dirfd(proc), path_buffer, O_RDONLY);
if (fd == -1)
{
perror("openat");
continue;
}
proc_meminfo_t meminfo;
if (read(fd, &meminfo, sizeof(meminfo)) == -1)
perror("read");
else
{
size_t percent_times_100 = 10000 * meminfo.phys_pages / meminfo.virt_pages;
printf(" vmem: %zu pages (%zu bytes)\n", meminfo.virt_pages, meminfo.page_size * meminfo.virt_pages);
printf(" pmem: %zu pages (%zu bytes) %zu.%02zu%%\n", meminfo.phys_pages, meminfo.page_size * meminfo.phys_pages, percent_times_100 / 100, percent_times_100 % 100);
}
close(fd);
}
}
closedir(proc);
}