diff options
Diffstat (limited to 'ps.c')
| -rw-r--r-- | ps.c | 118 |
1 files changed, 100 insertions, 18 deletions
@@ -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); } - |