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sortix--sortix/utils/ps.c

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/*
* Copyright (c) 2015 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* ps.c
* Lists processes.
*/
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#include <sys/types.h>
#include <err.h>
#include <errno.h>
#include <locale.h>
#include <psctl.h>
#include <pwd.h>
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#include <stdbool.h>
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static char* get_program_path_of_pid(pid_t pid)
{
struct psctl_program_path ctl;
memset(&ctl, 0, sizeof(ctl));
ctl.buffer = NULL;
ctl.size = 0;
if ( psctl(pid, PSCTL_PROGRAM_PATH, &ctl) < 0 )
return NULL;
while ( true )
{
char* new_buffer = (char*) realloc(ctl.buffer, ctl.size);
if ( !new_buffer )
return free(ctl.buffer), (char*) NULL;
ctl.buffer = new_buffer;
if ( psctl(pid, PSCTL_PROGRAM_PATH, &ctl) == 0 )
return ctl.buffer;
if ( errno != ERANGE )
return free(ctl.buffer), (char*) NULL;
}
}
static void compact_arguments(int* argc, char*** argv)
{
for ( int i = 0; i < *argc; i++ )
{
while ( i < *argc && !(*argv)[i] )
{
for ( int n = i; n < *argc; n++ )
(*argv)[n] = (*argv)[n+1];
(*argc)--;
}
}
}
static void help(FILE* fp, const char* argv0)
{
fprintf(fp, "Usage: %s [OPTION]...\n", argv0);
fprintf(fp, "List processes.\n");
}
static void version(FILE* fp, const char* argv0)
{
fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
}
int main(int argc, char* argv[])
{
setlocale(LC_ALL, "");
bool select_all = false;
bool show_full = false;
bool show_long = false;
const char* argv0 = argv[0];
for ( int i = 1; i < argc; i++ )
{
const char* arg = argv[i];
if ( arg[0] != '-' || !arg[1] )
continue;
argv[i] = NULL;
if ( !strcmp(arg, "--") )
break;
if ( arg[1] != '-' )
{
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char c;
while ( (c = *++arg) ) switch ( c )
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{
case 'a': select_all = true; break;
case 'A': select_all = true; break;
case 'd': select_all = true; break;
case 'e': select_all = true; break;
case 'f': show_full = true; break;
//case 'g': break;
//case 'G': break;
case 'l': show_long = true; break;
//case 'n': break;
//case 'o': break;
//case 'p': break;
//case 't': break;
//case 'u': break;
//case 'U': break;
default:
fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
help(stderr, argv0);
exit(1);
}
}
else if ( !strcmp(arg, "--help") )
help(stdout, argv0), exit(0);
else if ( !strcmp(arg, "--version") )
version(stdout, argv0), exit(0);
else
{
fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
help(stderr, argv0);
exit(1);
}
}
compact_arguments(&argc, &argv);
if ( 1 < argc )
err(1, "extra operand: %s", argv[1]);
if ( show_full || show_long )
printf("UID\t");
printf("PID\t");
if ( show_full || show_long )
printf("PPID\t");
if ( show_long )
printf("NI ");
printf("TTY ");
printf("TIME\t ");
printf("CMD\n");
pid_t pid = 0;
while ( true )
{
struct psctl_next_pid ctl_next_pid;
if ( psctl(pid, PSCTL_NEXT_PID, &ctl_next_pid) < 0 )
err(1, "psctl: PSCTL_NEXT_PID");
if ( (pid = ctl_next_pid.next_pid) == -1 )
break;
struct psctl_stat psst;
if ( psctl(pid, PSCTL_STAT, &psst) < 0 )
{
if ( errno != ESRCH )
warn("psctl: PSCTL_STAT: [%" PRIiPID "]", pid);
continue;
}
if ( !select_all && psst.euid != geteuid() )
continue;
if ( show_full )
{
struct passwd* pwd = getpwuid(psst.uid);
if ( pwd )
printf("%s\t", pwd->pw_name);
else
printf("%" PRIuUID "\t", psst.uid);
}
else if ( show_long )
printf("%" PRIuUID "\t", psst.uid);
printf("%" PRIiPID "\t", pid);
if ( show_full || show_long )
printf("%" PRIiPID "\t", psst.ppid);
if ( show_long )
printf("%-4i", psst.nice);
printf("tty ");
time_t time = psst.tmns.tmns_utime.tv_sec;
int hours = (time / (60 * 60)) % 24;
int minutes = (time / 60) % 60;
int seconds = (time / 1) % 60;
printf("%02i:%02i:%02i ", hours, minutes, seconds);
char* program_path = get_program_path_of_pid(pid);
// TODO: Strip special characters from the process name lest an attacker
// do things to the user's terminal.
printf("%s", program_path ? program_path : "<unknown>");
free(program_path);
printf("\n");
}
return ferror(stdout) || fflush(stdout) == EOF ? 1 : 0;
}