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