Re-write this according to my current c-taste

.clang-format

@@ -0,0 +1,12 @@
+
+---
+Language: Cpp
+BasedOnStyle: LLVM
+DerivePointerAlignment: false
+PointerAlignment: Left
+SortIncludes: false
+
+# Regroup causes unnecessary noise due to clang-format bug.
+IncludeBlocks: Preserve
+
+---

LICENSE

@@ -1,6 +1,6 @@
 BSD 3-Clause License
 
-Copyright (c) 2021, Edoardo Sanguineti
+Copyright (c) 2022, Edoardo Sanguineti
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without

common.c

@@ -1,15 +1,14 @@
+#include <time.h>
+#include <unistd.h>
+
 #include "common.h"
 
 // Prints the time
-void printTimeStamp(FILE *fp)
+void get_time_stamp(char* buf) {
-{
   time_t ltime;
   struct tm result;
-    char stime[32];
-    bzero(stime, sizeof(stime));
 
   ltime = time(NULL);
   localtime_r(&ltime, &result);
-    asctime_r(&result, stime);
+  asctime_r(&result, buf);
-    fprintf(fp, "\nTimeStamp: %s\n", stime);
 }

common.h

@@ -1,16 +1,8 @@
 #ifndef COMMON_H
 #define COMMON_H
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdarg.h>
-#include <string.h>
-#include <strings.h>
-#include <time.h>
-#include <unistd.h>
-
-void printTimeStamp(FILE *fp);
-
 #define BUFFER_SIZE 4096
 
+void get_time_stamp(char* buf);
+
 #endif /* COMMON_H */

main.c

@@ -1,18 +1,16 @@
-#include "common.h"
+#include <stdio.h>
 #include <signal.h>
+#include <unistd.h>
+
+#include "common.h"
 #include "monitor.h"
 
 volatile sig_atomic_t sigint_received = 0;
 
-void sigint_handler(int a)
+void sigint_handler(int a) { sigint_received = 1; }
-{
-    sigint_received = 1;
-}
 
-int main(int argc, char *argv[])
+int main(int argc, char* argv[]) {
-{
+  if (argc < 2) {
-    if (argc < 2)
-    {
     printf("Name of the program is missing\n");
     printf("Usage: <name of the program>\n");
     return 2;
@@ -22,11 +20,16 @@ int main(int argc, char *argv[])
   act.sa_handler = sigint_handler;
   sigaction(SIGINT, &act, NULL);
 
-    setup(argv[1]);
+  int result = setup(argv[1]);
+  if (result) {
+    return 1;
+  }
+
+  while (!sigint_received) {
+    if (analyse()) {
+      return 3;
+    }
 
-    while (!sigint_received)
-    {
-        analyse();
     sleep(10);
   }
 

makefile

@@ -1,7 +1,7 @@
-TARGET = prog
+TARGET = monitor
 LIBS = -lm
 CC = gcc
-CFLAGS = -O2 -g -Wall
+CFLAGS = -O2 -g -Wall -std=gnu11
 
 .PHONY: clean all default
 

monitor.c

@@ -1,165 +1,170 @@
-#include "common.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
 #include <errno.h>
-#include "monitor.h"
-#include "utils.h"
 
 #include <sys/types.h>
-#include <signal.h>
+
+#include "common.h"
+#include "utils.h"
+#include "monitor.h"
 
 #define MAX_MEMORY 1048576
 #define MAX_TRACK_SIZE 30
 
-FILE *popen(const char *command, const char *mode);
+FILE* popen(const char* command, const char* type);
 int pclose(FILE* stream);
 char* strerror(int errnum);
 
-void printGenericStatusError()
+static void print_generic_status_error() {
-{
   printf("Error while parsing file\n");
   printf("Processes may be monitored incorrectly\n");
 }
 
-void checkStatus(FILE *file, int *currRealMem, int *peakRealMem,
+static void check_status(FILE* file, int* curr_real_mem, int* peak_real_mem,
-                 int *currVirtMem, int *peakVirtMem)
+                         int* curr_virt_mem, int* peak_virt_mem) {
-{
 
   char result[BUFFER_SIZE];
-    bzero(result, sizeof(result));
+  memset(result, 0, sizeof result);
 
-    while (fscanf(file, " %1023s", result) == 1)
+  while (fscanf(file, " %1023s", result) == 1) {
-    {
+    if (strcmp(result, "VmRSS:") == 0) {
-        if (strcmp(result, "VmRSS:") == 0)
+      if (fscanf(file, " %d", curr_real_mem) == EOF) {
-        {
+        print_generic_status_error();
-            if (fscanf(file, " %d", currRealMem) == EOF)
-            {
-                printGenericStatusError();
         return;
       }
     }
 
-        if (strcmp(result, "VmHWM:") == 0)
+    if (strcmp(result, "VmHWM:") == 0) {
-        {
+      if (fscanf(file, " %d", peak_real_mem) == EOF) {
-            if (fscanf(file, " %d", peakRealMem) == EOF)
+        print_generic_status_error();
-            {
-                printGenericStatusError();
         return;
       }
     }
 
-        if (strcmp(result, "VmSize:") == 0)
+    if (strcmp(result, "VmSize:") == 0) {
-        {
+      if (fscanf(file, " %d", curr_virt_mem) == EOF) {
-            if (fscanf(file, " %d", currVirtMem) == EOF)
+        print_generic_status_error();
-            {
-                printGenericStatusError();
         return;
       }
     }
 
-        if (strcmp(result, "VmPeak:") == 0)
+    if (strcmp(result, "VmPeak:") == 0) {
-        {
+      if (fscanf(file, " %d", peak_virt_mem) == EOF) {
-            if (fscanf(file, " %d", peakVirtMem) == EOF)
+        print_generic_status_error();
-            {
-                printGenericStatusError();
         return;
       }
     }
   }
 }
 
-int isProcessWild(int currRealMem, int peakRealMem,
+static int is_process_wild(int curr_real_mem, int peak_real_mem,
-                  int currVirtMem, int peakVirtMem, int ID)
+                           int curr_virt_mem, int peak_virt_mem, int id) {
-{
+  if (curr_real_mem <= MAX_MEMORY) {
-    if (currRealMem <= MAX_MEMORY)
-    {
     return 0;
   }
 
   // Sends a polite request to terminate
-    printf("Terminating process: %d. Too much memory!\n", ID);
+  printf("Terminating process: %d. Memory: %d\n", id, curr_real_mem);
-    int result = kill(ID, SIGTERM);
+  int result = kill(id, SIGTERM);
-    if (result)
-    {
-        printf("Error while terminating process: %d\n", ID);
-        printf("Error message: %s\n", strerror(errno));
-    }
 
   // Logs
   FILE* fp;
-    fp = fopen("Diavolo.txt", "a");
+  fp = fopen("log.txt", "a");
-    if (fp == NULL)
+  if (fp == NULL) {
-    {
+    printf("Error while opening log.txt\n");
     perror("popen");
-        exit(EXIT_FAILURE);
-    }
-
-    printTimeStamp(fp);
-    fprintf(fp, "WARNING: Exceeded %d KiB of Real Memory for process ID: %d\n", MAX_MEMORY, ID);
-    fprintf(fp, "Process ID: %d\ncurrRealMem:%d KiB\npeakRealMem:%d KiB\ncurrVirtMem:%d KiB\npeakVirtMem:%d KiB\n", ID, currRealMem, peakRealMem, currVirtMem, peakVirtMem);
-    fclose(fp);
     return 1;
   }
 
-static int processID[MAX_TRACK_SIZE] = {0};
+  char time[32];
+  get_time_stamp(time);
 
-void setup(const char *pid)
+  fprintf(fp, "\nTimeStamp: %s\n", time);
-{
+  fprintf(fp, "WARNING: Exceeded %d KiB of Real Memory for process ID: %d\n",
+          MAX_MEMORY, id);
+  fprintf(fp,
+          "Process ID: %d\ncurr_real_mem:%d KiB\npeak_real_mem:%d "
+          "KiB\ncurr_virt_mem:%d KiB\npeak_virt_mem:%d KiB\n",
+          id, curr_real_mem, peak_real_mem, curr_virt_mem, peak_virt_mem);
+
+  if (result != 0) {
+    fprintf(fp, "Error while terminating process: %d\n", id);
+    fprintf(fp, "Error message: %s\n", strerror(errno));
+  }
+
+  fclose(fp);
+
+  return 1;
+}
+
+struct process_monitor {
+  int id;
+  int active;
+};
+
+static struct process_monitor processes[MAX_TRACK_SIZE];
+
+int setup(const char* pid) {
   char* command = va("pgrep %s", pid);
   FILE* file = popen(command, "r");
-    if (file == NULL)
+  if (file == NULL) {
-    {
     perror("popen");
-        exit(EXIT_FAILURE);
+    return 1;
   }
 
   char result[BUFFER_SIZE];
-    bzero(result, sizeof(result));
+  memset(result, 0, sizeof result);
   int i = 0;
 
-    while (fgets(result, BUFFER_SIZE, file))
+  memset(&processes, 0, sizeof(struct process_monitor));
-    {
+  while (fgets(result, BUFFER_SIZE, file) && i < MAX_TRACK_SIZE) {
     printf("Process ID: %s", result);
-        processID[i] = atoi(result);
+    processes[i].id = atoi(result);
-        i++;
+    processes[i].active = 1;
 
-        if (i >= MAX_TRACK_SIZE)
+    ++i;
-        {
-            printf("Too many processes found\n");
-            break;
-        }
   }
 
-    if (i == 0)
+  if (i == 0) {
-    {
     printf("No process was found\n");
-        exit(EXIT_SUCCESS);
-    }
-
     pclose(file);
+    return 1;
   }
 
-void analyse()
+  return 0;
-{
+}
+
+int analyse() {
   int i;
   FILE* status;
-    int currRealMem = 0, peakRealMem = 0, currVirtMem = 0, peakVirtMem = 0;
+  int curr_real_mem = 0, peak_real_mem = 0, curr_virt_mem = 0,
+      peak_virt_mem = 0;
 
-    for (i = 0; i < MAX_TRACK_SIZE && processID[i] != 0; i++)
+  for (i = 0; i < MAX_TRACK_SIZE && processes[i].active == 1; ++i) {
-    {
+    char* command = va("cat /proc/%d/status", processes[i].id);
-        char *command = va("cat /proc/%d/status", processID[i]);
     status = popen(command, "r");
-        if (status == NULL)
+    if (status == NULL) {
-        {
       perror("popen");
-            exit(EXIT_FAILURE);
+      pclose(status);
+      return 1;
     }
 
-        checkStatus(status, &currRealMem, &peakRealMem, &currVirtMem, &peakVirtMem);
+#ifdef _DEBUG
-        if (isProcessWild(currRealMem, peakRealMem, currVirtMem, peakVirtMem, processID[i]))
+    printf("Checking %d\n", processes[i].id);
-        {
+#endif
-            processID[i] = 0;
+
+    check_status(status, &curr_real_mem, &peak_real_mem, &curr_virt_mem,
+                 &peak_virt_mem);
+    if (is_process_wild(curr_real_mem, peak_real_mem, curr_virt_mem,
+                        peak_virt_mem, processes[i].id)) {
+      processes[i].active = 0;
     }
 
     pclose(status);
-        currRealMem = 0, peakRealMem = 0, currVirtMem = 0, peakVirtMem = 0;
+    curr_real_mem = 0, peak_real_mem = 0, curr_virt_mem = 0, peak_virt_mem = 0;
   }
+
+  return 0;
 }

monitor.h

@@ -1,7 +1,7 @@
 #ifndef MONITOR_H
 #define MONITOR_H
 
-void setup(const char *pid);
+int setup(const char* pid);
-void analyse();
+int analyse();
 
 #endif /* MONITOR_H */

utils.c

@@ -1,21 +1,29 @@
-#include "common.h"
+#include <stdio.h>
+#include <stdarg.h>
+#include <threads.h>
+
 #include "utils.h"
 
 #define VA_BUFFER_COUNT 4
 #define VA_BUFFER_SIZE 4096
 
-char *va(const char *fmt, ...)
+thread_local struct {
-{
+  char va_string[VA_BUFFER_COUNT][VA_BUFFER_SIZE];
-    static char g_vaBuffer[VA_BUFFER_COUNT][VA_BUFFER_SIZE];
+  int index;
-    static int g_vaNextBufferIndex = 0;
+} va_info_t;
 
+char* va(const char* fmt, ...) {
   va_list ap;
-    char *dest = &g_vaBuffer[g_vaNextBufferIndex][0];
+
-    bzero(dest, VA_BUFFER_SIZE);
+  int index = va_info_t.index;
-    g_vaNextBufferIndex = (g_vaNextBufferIndex + 1) % VA_BUFFER_COUNT;
+  va_info_t.index = (va_info_t.index + 1) % VA_BUFFER_COUNT;
+  char* buf = va_info_t.va_string[index];
+
   va_start(ap, fmt);
-    vsnprintf(dest, VA_BUFFER_SIZE, fmt, ap);
+  vsnprintf(buf, VA_BUFFER_SIZE, fmt, ap);
   va_end(ap);
 
-    return dest;
+  buf[VA_BUFFER_SIZE - 1] = '\0';
+
+  return buf;
 }