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#define _POSIX_C_SOURCE 200809L
#define _DEFAULT_SOURCE 1
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdbool.h>
#include <errno.h>
#include <dirent.h>
#include <limits.h>
#include <sys/stat.h>
#include <sys/types.h>
#define PROC_DIR "/proc"
#define TASK_COMM_LEN 32
static int page_size = -1;
static long clock_tick = -1;
typedef enum
{
FIELD_ARGS,
FIELD_COMM,
FIELD_PID,
FIELD_PPID,
FIELD_PGID,
FIELD_ETIME,
FIELD_TIME,
FIELD_GROUP,
FIELD_RGROUP,
FIELD_USER,
FIELD_RUSER,
FIELD_NICE,
FIELD_TTY,
FIELD_PCPU,
FIELD_VSZ,
FIELD_ADDR,
FIELD_ADDR,
FIELD_C,
FIELD_PRI,
FIELD_NI,
FIELD_ADDR,
FIELD_SZ,
FIELD_WCHAN,
} t_field_id;
typedef struct
{
t_field_id id;
char *specifier;
char *header;
int width;
} t_field_info;
static t_field_info field_infos[] = {
{FIELD_ARGS, "args", "COMMAND", 30},
{FIELD_COMM, "comm", "COMMAND", -1},
{FIELD_PID, "pid", "PID", 8},
{FIELD_PPID, "ppid", "PPID", 8},
{FIELD_PGID, "pgid", "PGID", 8},
{FIELD_ETIME, "etime", "ELAPSED", -1},
{FIELD_TIME, "time", "TIME", -1},
{FIELD_GROUP, "group", "GROUP", -1},
{FIELD_RGROUP, "rgroup", "RGROUP", -1},
{FIELD_USER, "user", "USER", -1},
{FIELD_RUSER, "ruser", "RUSER", -1},
{FIELD_NICE, "nice", "NI", -1},
{FIELD_TTY, "tty", "TT", -1},
{FIELD_PCPU, "pcpu", "%CPU", -1},
{FIELD_VSZ, "vsz", "VSZ", -1},
{FIELD_FLAGS, "f", "F", 1},
{FIELD_STATE, "s", "S", 1},
{FIELD_C, "c", "C", -1},
{FIELD_PRI, "pri", "PRI", -1},
{FIELD_ADDR, "addr", "ADDR", -1},
{FIELD_SZ, "sz", "SZ", -1},
{FIELD_WCHAN, "wchan", "WCHAN", -1},
};
t_field_info *filed_info_from_specifier(const char *specifier)
{
for (size_t i = 0; i < sizeof(field_infos) / sizeof(t_field_info); i++)
if (strcmp(field_infos[i].specifier, specifier) == 0)
return (&field_infos[i]);
return (NULL);
}
static struct stat proc_statbuf;
static char *stat_file;
static char *cmdfile_file;
void print_field_resource(t_field_info *field_info)
{
switch (field_info->id)
{
case FIELD_ARGS:
snprintf(file_path, PATH_MAX, "%s/%d/cmdline", PROC_DIR, pid);
FILE *cmdline_file = fopen(file_path, "r");
if (cmdline_file == NULL)
return;
int c = EOF;
while ((c = fgetc(cmdline_file)) != EOF)
fputc(c, stdout);
break;
case FIELD_COMM:
char *closing_parent = strrchr(proc_stat.comm + 0, ')');
if (closing_parent != NULL)
*closing_parent = '\0';
printf("%s", proc_stat.comm + 1);
break;
case FIELD_PID: printf("%*ld ", info.width, proc_stat.pid); break;
case FIELD_PPID: printf("%*ld ", info.width, proc_stat.ppid); break;
case FIELD_PGID: printf("%*ld ", info.width, proc_stat.pgrp); break;
case FIELD_ETIME:
printf("%6lld ", /*current -*/ proc_stat.starttime / clock_tick);
break;
case FIELD_TIME:
printf("%6lld ", proc_stat.starttime / clock_tick);
break;
case FIELD_GROUP:
break;
case FIELD_RGROUP:
break;
case FIELD_USER:
printf("%6d ", proc_statbuf.st_uid);
break;
case FIELD_RUSER:
break;
case FIELD_NICE:
printf("%3ld ", proc_stat.nice);
break;
case FIELD_PRI:
printf("%3ld ", proc_stat.priority);
break;
case FIELD_TTY:
printf("%6d ", proc_stat.tty_nr);
break;
case FIELD_PCPU:
break;
case FIELD_VSZ:
printf("%5ld ", proc_stat.vsize / page_size);
break;
case FIELD_ADDR:
break;
case FIELD_FLAGS:
printf("%o ", 0); //proc_stat.flags,
break;
case FIELD_STATE:
printf("%c ", proc_stat.state);
break;
case FIELD_C:
break;
case FIELD_SZ:
break;
case FIELD_WCHAN:
printf("%4ld ", proc_stat.wchan);
break;
default:
exit(1);
}
}
char full_format[] = "user pid ppid c stime tty time args";
char long_format[] = "f s user pid ppid c pri ni addr sz wchan tty time cmd";
char default_format[] = "pid tty time cmd";
size_t fields_size = 0;
t_field_info **field_infos = NULL;
void field_infos_from_format(char *format)
{
size_t i;
for (i = 0; format[i] != '\0'; i++)
if (isspace(format[i]) && isspace(format[i + 1]))
exit(1);
fields_size = 0;
for (i = 0; format[i] != '\0'; i++)
if (isspace(format[i]))
fields_size++;
field_infos = malloc(fields_size * sizeof(t_field_info*));
if (field_infos == NULL)
exit(1);
i = 0;
char *specifier = NULL;
while ((specifier = strsep(&format, " ,")) != NULL)
{
field_infos[i] = field_info_from_specifier(specifier);
if (field_infos[i] == NULL)
exit(1);
i++;
}
}
void print_header(void)
{
for (size_t i = 0; i < fields_size; i++)
printf("%*s ", field_infos[i].width, field_infos[i].header);
}
typedef struct
{
pid_t pid;
char comm[TASK_COMM_LEN];
char state;
pid_t ppid;
pid_t pgrp;
int session;
int tty_nr;
int tpgid;
unsigned int flags;
unsigned long minflt;
unsigned long cminflt;
unsigned long majflt;
unsigned long cmajflt;
unsigned long utime;
unsigned long stime;
long cutime;
long cstime;
long priority;
long nice;
long num_threads;
long itrealvalue;
unsigned long long starttime;
unsigned long vsize;
long rss;
unsigned long rsslim;
unsigned long startcode;
unsigned long endcode;
unsigned long startstack;
unsigned long kstkesp;
unsigned long kstkeip;
unsigned long signal;
unsigned long blocked;
unsigned long sigignore;
unsigned long sigcatch;
unsigned long wchan;
unsigned long nswap;
unsigned long cnswap;
int exit_signal;
int processor;
unsigned int rt_priority;
unsigned long delayacct_blkio_ticks;
unsigned long guest_time;
long cguest_time;
unsigned long end_data;
unsigned long start_brk;
unsigned long arg_start;
unsigned long arg_end;
unsigned long env_start;
unsigned long env_end;
int exit_code;
} t_proc_stat;
int main(int argc, char **argv)
{
field_infos_from_format(default_format);
free(field_infos);
return;
page_size = getpagesize();
clock_tick = sysconf(_SC_CLK_TCK);
DIR *proc_dir = opendir(PROC_DIR);
if (proc_dir == NULL)
exit(1);
struct dirent *proc_dir_entry = NULL;
while ((proc_dir_entry = readdir(proc_dir)) != NULL)
{
pid_t pid = 0;
if (sscanf(proc_dir_entry->d_name, "%d", &pid) != 1)
continue;
char file_path[PATH_MAX + 1] = {'\0'};
snprintf(file_path, PATH_MAX, "%s/%d/stat", PROC_DIR, pid);
FILE *stat_file = fopen(file_path, "r");
if (stat_file == NULL)
continue;
t_proc_stat proc_stat;
fscanf(
stat_file,
"%d %s %c %d %d %d %d %d %u %lu %lu %lu %lu %lu %lu %ld %ld %ld %ld %ld %ld "
"%llu %lu %ld %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u "
"%llu %lu %ld %lu %lu %lu %lu %lu %lu %d",
&proc_stat.pid,
&proc_stat.comm,
&proc_stat.state,
&proc_stat.ppid,
&proc_stat.pgrp,
&proc_stat.session,
&proc_stat.tty_nr,
&proc_stat.tpgid,
&proc_stat.flags,
&proc_stat.minflt,
&proc_stat.cminflt,
&proc_stat.majflt,
&proc_stat.cmajflt,
&proc_stat.utime,
&proc_stat.stime,
&proc_stat.cutime,
&proc_stat.cstime,
&proc_stat.priority,
&proc_stat.nice,
&proc_stat.num_threads,
&proc_stat.itrealvalue,
&proc_stat.starttime,
&proc_stat.vsize,
&proc_stat.rss,
&proc_stat.rsslim,
&proc_stat.startcode,
&proc_stat.endcode,
&proc_stat.startstack,
&proc_stat.kstkesp,
&proc_stat.kstkeip,
&proc_stat.signal,
&proc_stat.blocked,
&proc_stat.sigignore,
&proc_stat.sigcatch,
&proc_stat.wchan,
&proc_stat.nswap,
&proc_stat.cnswap,
&proc_stat.exit_signal,
&proc_stat.processor,
&proc_stat.rt_priority,
&proc_stat.delayacct_blkio_ticks,
&proc_stat.guest_time,
&proc_stat.cguest_time,
&proc_stat.end_data,
&proc_stat.start_brk,
&proc_stat.arg_start,
&proc_stat.arg_end,
&proc_stat.env_start,
&proc_stat.env_end,
&proc_stat.exit_code
);
struct stat statbuf;
if (stat(file_path, &statbuf) == -1)
continue;
fputc('\n', stdout);
break;
}
return 0;
}
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