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pstree: manpage, print pid in first column, bio, silly walks

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cinap_lenrek 2012-11-08 00:06:54 +01:00
parent 6f1efd37a2
commit 01d28b9d89
2 changed files with 29 additions and 23 deletions
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5
sys/man/1/ps
View File

@ -109,7 +109,10 @@ flag causes
to print the arguments for the process. Newlines in arguments will be translated to spaces for display.
.PP
.I Pstree
shows the processes as a tree.
prints the processes as a tree in a two colum layout where
the first colum being the process id and second column
the program name and arguments indented and prefixed with
line drawing runes to reflect the nesting in the hierarchy.
.SH FILES
.B /proc/*/status
.SH SOURCE

47
sys/src/cmd/pstree.c
View File

@ -1,5 +1,6 @@
#include <u.h>
#include <libc.h>
#include <bio.h>
typedef struct Proc Proc;
struct Proc {
@ -8,8 +9,9 @@ struct Proc {
Proc *hash;
};
Proc *hash[1024];
Rune buf[512];
Proc *hash[1024];
Rune buf[512];
Biobuf bout;
Proc *
getproc(int pid)
@ -42,7 +44,7 @@ theppid(int pid)
int fd, ppid;
ppid = 0;
snprint(b, sizeof(b), "/proc/%d/ppid", pid);
snprint(b, sizeof(b), "%d/ppid", pid);
fd = open(b, OREAD);
if(fd >= 0){
memset(b, 0, sizeof b);
@ -79,7 +81,7 @@ addprocs(void)
int fd, rc, i;
Dir *d;
fd = open("/proc", OREAD);
fd = open(".", OREAD);
if(fd < 0)
sysfatal("open: %r");
rc = dirreadall(fd, &d);
@ -109,8 +111,7 @@ readout(char *file)
for(i=0; i<rc; i++)
if(b[i] == '\n')
b[i] = ' ';
write(1, b, rc);
n += rc;
n += Bwrite(&bout, b, rc);
}
close(fd);
return n;
@ -122,25 +123,21 @@ printargs(int pid)
char b[128], *p;
int fd;
if(pid == 0)
return;
snprint(b, sizeof(b), "/proc/%d/args", pid);
snprint(b, sizeof(b), "%d/args", pid);
if(readout(b) > 0)
return;
snprint(b, sizeof(b), "/proc/%d/status", pid);
snprint(b, sizeof(b), "%d/status", pid);
fd = open(b, OREAD);
if(fd < 0)
return;
memset(b, 0, sizeof b);
if(read(fd, b, 27) <= 0){
if(fd >= 0){
memset(b, 0, sizeof b);
if(read(fd, b, 27) > 0){
p = b + strlen(b);
while(p > b && p[-1] == ' ')
*--p = 0;
Bprint(&bout, "%s", b);
}
close(fd);
return;
}
p = b + strlen(b)-1;
while(p > b && *p == ' ')
*p-- = 0;
print("%s", b);
close(fd);
}
void
@ -152,9 +149,9 @@ descend(Proc *p, Rune *r)
last = *--r;
*r = last == L' ' ? L'└' : L'├';
if(p->pid != 0){
print("%S", buf);
Bprint(&bout, "%-11d %S", p->pid, buf);
printargs(p->pid);
print(" [%d]\n", p->pid);
Bprint(&bout, "\n");
}
*r = last;
*++r = L'│';
@ -175,7 +172,13 @@ printprocs(void)
void
main()
{
Binit(&bout, 1, OWRITE);
if(chdir("/proc")==-1)
sysfatal("chdir: %r");
addproc(0);
addprocs();
printprocs();
exits(0);
}