ubase/ps.c
Hiltjo Posthuma e45e64491e Only check errno if getpwuid() fails
Checking errno otherwise is unspecified.
2014-07-09 15:08:11 +01:00

192 lines
3.9 KiB
C

/* See LICENSE file for copyright and license details. */
#include <sys/ioctl.h>
#include <sys/sysinfo.h>
#include <errno.h>
#include <limits.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "proc.h"
#include "util.h"
static void psout(struct procstat *ps);
static void psr(const char *file);
enum {
PS_aflag = 1 << 0,
PS_Aflag = 1 << 1,
PS_dflag = 1 << 2,
PS_fflag = 1 << 3
};
static void
usage(void)
{
eprintf("usage: [-aAdef] %s\n", argv0);
}
static int flags;
int
main(int argc, char *argv[])
{
ARGBEGIN {
case 'a':
flags |= PS_aflag;
break;
case 'A':
flags |= PS_Aflag;
break;
case 'd':
flags |= PS_dflag;
break;
case 'e':
flags |= PS_Aflag;
break;
case 'f':
flags |= PS_fflag;
break;
default:
usage();
} ARGEND;
if (!(flags & PS_fflag))
printf(" PID TTY TIME CMD\n");
else
printf("UID PID PPID C STIME TTY TIME CMD\n");
recurse("/proc", psr);
return EXIT_SUCCESS;
}
static void
psout(struct procstat *ps)
{
struct procstatus pstatus;
char cmdline[BUFSIZ], *cmd;
char buf[BUFSIZ];
char *ttystr, *myttystr;
int tty_maj, tty_min;
uid_t myeuid;
unsigned sutime;
time_t start;
char stimestr[sizeof("%H:%M")];
struct sysinfo info;
struct passwd *pw;
struct winsize w;
/* Ignore session leaders */
if (flags & PS_dflag)
if (ps->pid == ps->sid)
return;
devtotty(ps->tty_nr, &tty_maj, &tty_min);
ttystr = ttytostr(tty_maj, tty_min);
/* Only print processes that are associated with
* a terminal and they are not session leaders */
if (flags & PS_aflag) {
if (ps->pid == ps->sid || ttystr[0] == '?') {
free(ttystr);
return;
}
}
if (parsestatus(ps->pid, &pstatus) < 0)
return;
/* This is the default case, only print processes that have
* the same controlling terminal as the invoker and the same
* euid as the current user */
if (!(flags & (PS_aflag | PS_Aflag | PS_dflag))) {
myttystr = ttyname(STDIN_FILENO);
if (myttystr) {
if (strcmp(myttystr + strlen("/dev/"), ttystr)) {
free(ttystr);
return;
}
} else {
/* The invoker has no controlling terminal - just
* go ahead and print the processes anyway */
ttystr[0] = '?';
ttystr[1] = '\0';
}
myeuid = geteuid();
if (myeuid != pstatus.euid) {
free(ttystr);
return;
}
}
sutime = (ps->stime + ps->utime) / sysconf(_SC_CLK_TCK);
ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
if (!(flags & PS_fflag)) {
snprintf(buf, sizeof(buf), "%5d %-6s %02u:%02u:%02u %s", ps->pid, ttystr,
sutime / 3600, (sutime % 3600) / 60, sutime % 60,
ps->comm);
if (w.ws_col)
printf("%.*s\n", w.ws_col, buf);
else
printf("%s\n", buf);
} else {
errno = 0;
pw = getpwuid(pstatus.uid);
if (!pw) {
if (errno)
eprintf("getpwuid %d:", pstatus.uid);
else
eprintf("getpwuid %d: no such user\n", id);
}
if (sysinfo(&info) < 0)
eprintf("sysinfo:");
start = time(NULL) - info.uptime;
start += (ps->starttime / sysconf(_SC_CLK_TCK));
strftime(stimestr, sizeof(stimestr),
"%H:%M", localtime(&start));
/* For kthreads/zombies /proc/<pid>/cmdline will be
* empty so use ps->comm in that case */
if (parsecmdline(ps->pid, cmdline, sizeof(cmdline)) < 0)
cmd = ps->comm;
else
cmd = cmdline;
snprintf(buf, sizeof(buf), "%-8s %5d %5d ? %5s %-5s %02u:%02u:%02u %s%s%s",
pw->pw_name, ps->pid,
ps->ppid, stimestr, ttystr,
sutime / 3600, (sutime % 3600) / 60, sutime % 60,
(cmd == ps->comm) ? "[" : "", cmd,
(cmd == ps->comm) ? "]" : "");
if (w.ws_col)
printf("%.*s\n", w.ws_col, buf);
else
printf("%s\n", buf);
}
free(ttystr);
}
static void
psr(const char *file)
{
char path[PATH_MAX], *p;
struct procstat ps;
pid_t pid;
if (strlcpy(path, file, sizeof(path)) >= sizeof(path))
eprintf("path too long\n");
p = basename(path);
if (pidfile(p) == 0)
return;
pid = estrtol(p, 10);
if (parsestat(pid, &ps) < 0)
return;
psout(&ps);
}