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jobs.c
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jobs.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <sys/types.h>
#include <dirent.h>
#include <unistd.h>
#include <sys/stat.h>
#include <regex.h>
extern int alphasort();
#define MAX_LENGTH 4096;
#define __PROGRAM_NAME__ "jobs"
int find_if_no(char *str){
int size = strlen(str);
for(int i=0;i < size;i++){
if(!isdigit(str[i]))
return 1;
}
return 0;
}
char get_stat(char *dirname,char *reg_str, char *prop){
/* string matching to find information of process */
FILE * fp;
char * line = NULL;
size_t len = 0;
ssize_t read;
char ans;
char *filename = (char *)malloc((strlen("/proc/") + strlen(dirname) + strlen("/status") + 2)*sizeof(char)) ;
strcpy(filename,"/proc/");
strcat(filename,dirname);
strcat(filename,"/status");
/* regex for pattern matching */
regex_t reg;
int ret_val = regcomp(®,reg_str,0);
if(ret_val)
fprintf(stderr,"%s : regex compilation\n",__PROGRAM_NAME__);
fp = fopen(filename, "r");
if (fp == NULL){
fprintf(stderr,"%s : cannot access %s",__PROGRAM_NAME__,filename);
exit(EXIT_FAILURE);
}
/* comparing the strings line by line */
while ((read = getline(&line, &len, fp)) != -1) {
if(!regexec(®,line,0,NULL,0))
break;
}
/* printing the value */
if(!strcmp(prop,"memory")){
for(int i=0;i<strlen(line);i++){
if(isdigit(line[i]))
printf("%c",line[i]);
}
}
else
ans = line[7];
/* closing the files and refrences */
fclose(fp);
if (line)
free(line);
return ans;
}
char job_proc(pid_t process){
/* finds a folder with same name as pid (same is done by command ps) */
struct dirent **namelist;
int no_of_files;
/* finds all the files inside the given directory */
no_of_files = scandir("/proc",&namelist,0,alphasort);
if(no_of_files < 0){
fprintf(stderr,"%s : pinfo",__PROGRAM_NAME__);
return 1;
}
/* checks if a directory with the same name as pid exists */
short flag = 0;
char *dirname;
for(int i=0;i<no_of_files;i++){
if(!find_if_no(namelist[i] -> d_name)){
if(atoi(namelist[i] -> d_name) == process){
flag = 1;
dirname = (char *)malloc((strlen(namelist[i] -> d_name) + 2) * sizeof(char));
strcpy(dirname,namelist[i] -> d_name);
break;
}
}
free(namelist[i]);
}
free(namelist);
/* exit status for file not existing */
if(!flag){
return 'N';
}
char reg_stat[] = "State";
char prop_stat[] = "Process Status";
char val = get_stat(dirname,reg_stat,prop_stat);
return val;
}