185 lines
2.6 KiB
C
185 lines
2.6 KiB
C
#include <u.h>
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#include <libc.h>
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#include <bio.h>
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typedef struct Proc Proc;
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struct Proc {
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int pid;
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Proc *first, *parent, *next;
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Proc *hash;
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};
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Proc *hash[1024];
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Rune buf[512];
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Biobuf bout;
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Proc *
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getproc(int pid)
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{
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Proc *p;
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for(p = hash[pid % nelem(hash)]; p; p = p->hash)
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if(p->pid == pid)
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return p;
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return nil;
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}
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void
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addproc(int pid)
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{
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Proc *p;
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p = mallocz(sizeof(*p), 1);
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if(p == nil)
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sysfatal("malloc: %r");
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p->pid = pid;
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p->hash = hash[pid % nelem(hash)];
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hash[pid % nelem(hash)] = p;
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}
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int
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theppid(int pid)
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{
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char b[128];
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int fd, ppid;
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ppid = 0;
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snprint(b, sizeof(b), "%d/ppid", pid);
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fd = open(b, OREAD);
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if(fd >= 0){
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memset(b, 0, sizeof b);
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if(read(fd, b, sizeof b-1) >= 0){
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ppid = atoi(b);
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if(ppid < 0)
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ppid = 0;
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}
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close(fd);
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}
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return ppid;
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}
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void
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addppid(int pid)
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{
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Proc *p, *par, **l;
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p = getproc(pid);
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par = getproc(theppid(pid));
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if(par == nil)
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par = getproc(0);
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p->parent = par;
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for(l = &par->first; *l; l = &((*l)->next))
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if((*l)->pid > pid)
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break;
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p->next = *l;
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*l = p;
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}
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void
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addprocs(void)
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{
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int fd, rc, i;
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Dir *d;
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fd = open(".", OREAD);
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if(fd < 0)
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sysfatal("open: %r");
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rc = dirreadall(fd, &d);
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if(rc < 0)
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sysfatal("dirreadall: %r");
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close(fd);
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for(i = 0; i < rc; i++)
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if(d[i].mode & DMDIR)
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addproc(atoi(d[i].name));
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for(i = 0; i < rc; i++)
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if(d[i].mode & DMDIR)
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addppid(atoi(d[i].name));
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free(d);
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}
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int
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readout(char *file)
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{
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int fd, rc, i, n;
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char b[512];
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fd = open(file, OREAD);
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if(fd < 0)
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return -1;
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n = 0;
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while((rc = read(fd, b, sizeof b)) > 0){
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for(i=0; i<rc; i++)
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if(b[i] == '\n')
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b[i] = ' ';
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n += Bwrite(&bout, b, rc);
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}
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close(fd);
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return n;
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}
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void
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printargs(int pid)
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{
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char b[128], *p;
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int fd;
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snprint(b, sizeof(b), "%d/args", pid);
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if(readout(b) > 0)
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return;
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snprint(b, sizeof(b), "%d/status", pid);
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fd = open(b, OREAD);
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if(fd >= 0){
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memset(b, 0, sizeof b);
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if(read(fd, b, 27) > 0){
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p = b + strlen(b);
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while(p > b && p[-1] == ' ')
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*--p = 0;
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Bprint(&bout, "%s", b);
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}
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close(fd);
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}
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}
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void
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descend(Proc *p, Rune *r)
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{
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Rune last;
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Proc *q;
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last = *--r;
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*r = last == L' ' ? L'└' : L'├';
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if(p->pid != 0){
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Bprint(&bout, "%-11d %S", p->pid, buf);
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printargs(p->pid);
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Bprint(&bout, "\n");
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}
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*r = last;
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*++r = L'│';
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for(q = p->first; q; q = q->next) {
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if(q->next == nil)
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*r = L' ';
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descend(q, r + 1);
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}
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*r = 0;
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}
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void
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printprocs(void)
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{
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descend(getproc(0), buf);
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}
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void
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main()
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{
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Binit(&bout, 1, OWRITE);
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if(chdir("/proc")==-1)
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sysfatal("chdir: %r");
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addproc(0);
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addprocs();
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printprocs();
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exits(0);
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}
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