DeforaOS/utils
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Added a simplified version of the -gpu flags

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This commit is contained in:
Pierre Pronchery 2011-04-02 00:05:49 +00:00
parent 383e81a765
commit 9ce66c7e3a
1 changed files with 64 additions and 6 deletions
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70
src/ps.c
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@ -15,35 +15,73 @@
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <grp.h>
#include <pwd.h>
#include <limits.h>
/* ps */
/* private */
/* types */
typedef struct _Prefs
{
char const * group;
pid_t pid;
char const * username;
} Prefs;
/* prototypes */
static int _ps(Prefs * prefs);
static int _ps_error(char const * message, int ret);
static int _ps(void)
/* functions */
/* ps */
static int _ps(Prefs * prefs)
{
char const proc[] = "/proc";
struct passwd * pw = NULL;
struct group * gr = NULL;
char buf[256];
DIR * dir;
struct dirent * de;
long pid;
char * p;
FILE * fp;
struct stat st;
size_t s;
if(prefs->username != NULL && (pw = getpwnam(prefs->username)) == NULL)
return -_ps_error(prefs->username, 1);
if(prefs->group != NULL && (gr = getgrnam(prefs->group)) == NULL)
return -_ps_error(prefs->group, 1);
if((dir = opendir(proc)) == NULL)
return -_ps_error(proc, 1);
printf("%5s %s\n", "PID", "CMD");
printf("%5s %5s %s\n", "PID", "UID", "CMD");
while((de = readdir(dir)) != NULL)
{
pid = strtol(de->d_name, &p, 10);
if(de->d_name[0] == '\0' || *p != '\0' || pid < 0)
continue;
if(prefs->pid != -1 && pid != prefs->pid)
continue;
snprintf(buf, sizeof(buf), "%s/%s", proc, de->d_name);
if(lstat(buf, &st) != 0)
{
_ps_error(buf, 0);
continue;
}
if(pw != NULL && st.st_uid != pw->pw_uid)
continue;
if(gr != NULL && st.st_gid != gr->gr_gid)
continue;
snprintf(buf, sizeof(buf), "%s/%s/%s", proc, de->d_name,
"cmdline");
if((fp = fopen(buf, "r")) != NULL)
@ -54,12 +92,14 @@ static int _ps(void)
}
else
buf[0] = '\0';
printf("%5lu %s\n", pid, buf);
printf("%5lu %5lu %s\n", pid, (unsigned long)st.st_uid, buf);
}
closedir(dir);
return 0;
}
/* ps_error */
static int _ps_error(char const * message, int ret)
{
fputs("ps: ", stderr);
@ -71,23 +111,41 @@ static int _ps_error(char const * message, int ret)
/* usage */
static int _usage(void)
{
fputs("Usage: ps\n", stderr);
fputs("Usage: ps [-g group][-p pid][-u username]\n", stderr);
return 1;
}
/* public */
/* functions */
/* main */
int main(int argc, char * argv[])
{
Prefs prefs;
int o;
char * p;
while((o = getopt(argc, argv, "")) != -1)
memset(&prefs, 0, sizeof(prefs));
prefs.pid = -1;
while((o = getopt(argc, argv, "g:p:u:")) != -1)
switch(o)
{
case 'g':
prefs.group = optarg;
break;
case 'p':
prefs.pid = strtol(optarg, &p, 0);
if(optarg[0] == '\0' || *p != '\0'
|| prefs.pid < 0)
return _usage();
break;
case 'u':
prefs.username = optarg;
break;
default:
return _usage();
}
if(optind != argc)
return _usage();
return (_ps() == 0) ? 0 : 2;
return (_ps(&prefs) == 0) ? 0 : 2;
}