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Made ps work. Fixed some stuff.

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This commit is contained in:
Eric Andersen
1999-10-20 19:18:15 +00:00
parent ef8b6c757d
commit d23f9ba0f6
9 changed files with 309 additions and 114 deletions
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118
ps.c
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@ -23,16 +23,82 @@
#include <unistd.h>
#include <dirent.h>
#include <stdio.h>
#include <fcntl.h>
#include <ctype.h>
typedef struct proc_s {
char
cmd[16]; /* basename of executable file in call to exec(2) */
int
ruid, rgid, /* real only (sorry) */
pid, /* process id */
ppid; /* pid of parent process */
char
state; /* single-char code for process state (S=sleeping) */
} proc_t;
static int file2str(char *filename, char *ret, int cap)
{
int fd, num_read;
if ( (fd = open(filename, O_RDONLY, 0)) == -1 ) return -1;
if ( (num_read = read(fd, ret, cap - 1)) <= 0 ) return -1;
ret[num_read] = 0;
close(fd);
return num_read;
}
static void parse_proc_status(char* S, proc_t* P)
{
char* tmp;
memset(P->cmd, 0, sizeof P->cmd);
sscanf (S, "Name:\t%15c", P->cmd);
tmp = strchr(P->cmd,'\n');
if (tmp)
*tmp='\0';
tmp = strstr (S,"State");
sscanf (tmp, "State:\t%c", &P->state);
tmp = strstr (S,"Pid:");
if(tmp) sscanf (tmp,
"Pid:\t%d\n"
"PPid:\t%d\n",
&P->pid,
&P->ppid
);
else fprintf(stderr, "Internal error!\n");
/* For busybox, ignoring effecting, saved, etc */
tmp = strstr (S,"Uid:");
if(tmp) sscanf (tmp,
"Uid:\t%d", &P->ruid);
else fprintf(stderr, "Internal error!\n");
tmp = strstr (S,"Gid:");
if(tmp) sscanf (tmp,
"Gid:\t%d", &P->rgid);
else fprintf(stderr, "Internal error!\n");
}
extern int ps_main(int argc, char **argv)
{
proc_t p;
DIR *dir;
FILE *file;
struct dirent *entry;
char path[32], sbuf[512];
char uidName[10]="";
char groupName[10]="";
int i, c;
if ( argc>1 && **(argv+1) == '-' ) {
usage ("ps\n");
usage ("ps - report process status\nThis version of ps accepts no options.\n");
}
dir = opendir("/proc");
@ -41,28 +107,44 @@ extern int ps_main(int argc, char **argv)
exit(FALSE);
}
fprintf(stdout, "PID\tUid\tGid\tState\tName\n");
fprintf(stdout, "%5s %-8s %-3s %5s %s\n", "PID", "Uid", "Gid", "State", "Command");
while ((entry = readdir(dir)) != NULL) {
char psStatus[NAME_MAX];
char psName[NAME_MAX]="";
char psState[NAME_MAX]="";
int psPID=0, psPPID=0, psUid=0, psGid=0;
//if (match(entry->d_name, "[0-9]") == FALSE)
// continue;
sprintf(psStatus, "/proc/%s/status", entry->d_name);
file = fopen( psStatus, "r");
if (file == NULL) {
uidName[0]='\0';
groupName[0]='\0';
if (! isdigit(*entry->d_name))
continue;
//perror(psStatus);
//exit( FALSE);
sprintf(path, "/proc/%s/status", entry->d_name);
if ((file2str(path, sbuf, sizeof sbuf)) != -1 ) {
parse_proc_status(sbuf, &p);
}
fscanf(file, "Name:\t%s\nState:\t%s\nPid:\t%d\nPPid:\t%d\nUid:\t%d\nGid:\t%d",
psName, psState, &psPID, &psPPID, &psUid, &psGid);
fclose(file);
fprintf(stdout, "%d\t%d\t%d\t%s\t%s\n", psPID, psUid, psGid, psState, psName);
/* Make some adjustments as needed */
my_getpwuid( uidName, p.ruid);
my_getgrgid( groupName, p.rgid);
if (*uidName == '\0')
sprintf( uidName, "%d", p.ruid);
if (*groupName == '\0')
sprintf( groupName, "%d", p.rgid);
fprintf(stdout, "%5d %-8s %-8s %c ", p.pid, uidName, groupName, p.state);
sprintf(path, "/proc/%s/cmdline", entry->d_name);
file = fopen(path, "r");
if (file == NULL) {
perror(path);
exit(FALSE);
}
i=0;
while (((c = getc(file)) != EOF) && (i < 53)) {
i++;
if (c == '\0')
c = ' ';
putc(c, stdout);
}
if (i==0)
fprintf(stdout, "%s", p.cmd);
fprintf(stdout, "\n");
}
closedir(dir);
exit(TRUE);
}