diff options
| author | Denis Vlasenko <vda.linux@googlemail.com> | 2007-06-19 18:43:17 +0400 |
|---|---|---|
| committer | Denis Vlasenko <vda.linux@googlemail.com> | 2007-06-19 18:43:17 +0400 |
| commit | 31789a81d5751acaaf373e8ede2932208161f869 (patch) | |
| tree | 8b3fe7e25ca247fc8d4e44102cef8b23a92f0354 | |
| parent | 362c6ec6941c774992abcf008459616dbce0e7af (diff) | |
top,ps: 'stringify' tty only when needed. -60 bytes.
| -rw-r--r-- | include/libbb.h | 5 | ||||
| -rw-r--r-- | libbb/procps.c | 24 | ||||
| -rw-r--r-- | procps/ps.c | 5 |
3 files changed, 12 insertions, 22 deletions
diff --git a/include/libbb.h b/include/libbb.h index 999caae0c..9ca565348 100644 --- a/include/libbb.h +++ b/include/libbb.h @@ -847,10 +847,9 @@ typedef struct { unsigned sid; unsigned uid; unsigned gid; + unsigned tty_major,tty_minor; char state[4]; - char tty_str[8]; /* "maj,min" or "?" */ - /* basename of executable in exec(2), read from /proc/N/stat, */ - /* size from sizeof(task_struct.comm) in /usr/include/linux/sched.h */ + /* basename of executable in exec(2), read from /proc/N/stat */ char comm[COMM_LEN]; /* user/group? - use passwd/group parsing functions */ } procps_status_t; diff --git a/libbb/procps.c b/libbb/procps.c index e04ff34ff..10ddabf94 100644 --- a/libbb/procps.c +++ b/libbb/procps.c @@ -225,30 +225,18 @@ procps_status_t* procps_scan(procps_status_t* sp, int flags) break; sp->vsz = vsz >> 10; /* vsize is in bytes and we want kb */ sp->rss = rss >> 10; - - sp->tty_str[0] = '?'; - /* sp->tty_str[1] = '\0'; - done by memset */ - if (tty) /* tty field of "0" means "no tty" */ - snprintf(sp->tty_str, sizeof(sp->tty_str), "%u,%u", - (tty >> 8) & 0xfff, /* major */ - (tty & 0xff) | ((tty >> 12) & 0xfff00)); + sp->tty_major = (tty >> 8) & 0xfff; + sp->tty_minor = (tty & 0xff) | ((tty >> 12) & 0xfff00)); #else /* This costs ~100 bytes more but makes top faster by 20% * If you run 10000 processes, this may be important for you */ - cp += 2; - sp->state[0] = *cp++; cp++; - sp->ppid = fast_strtoul_10(cp, &cp); + sp->state[0] = cp[2]; + sp->ppid = fast_strtoul_10(cp + 4, &cp); sp->pgid = fast_strtoul_10(cp, &cp); sp->sid = fast_strtoul_10(cp, &cp); - sp->tty_str[0] = '?'; - /* sp->tty_str[1] = '\0'; - done by memset */ tty = fast_strtoul_10(cp, &cp); - if (tty && (flags & PSSCAN_TTY)) { - /* tty field of "0" means "no tty" */ - snprintf(sp->tty_str, sizeof(sp->tty_str), "%u,%u", - (tty >> 8) & 0xfff, /* major */ - (tty & 0xff) | ((tty >> 12) & 0xfff00)); - } + sp->tty_major = (tty >> 8) & 0xfff; + sp->tty_minor = (tty & 0xff) | ((tty >> 12) & 0xfff00); cp = skip_fields(cp, 6); /* tpgid, flags, min_flt, cmin_flt, maj_flt, cmaj_flt */ sp->utime = fast_strtoul_10(cp, &cp); sp->stime = fast_strtoul_10(cp, &cp); diff --git a/procps/ps.c b/procps/ps.c index c3023cf5e..fd53eca5b 100644 --- a/procps/ps.c +++ b/procps/ps.c @@ -68,7 +68,10 @@ static void func_rss(char *buf, int size, const procps_status_t *ps) static void func_tty(char *buf, int size, const procps_status_t *ps) { - safe_strncpy(buf, ps->tty_str, size+1); + buf[0] = '?'; + buf[1] = '\0'; + if (ps->tty_major) /* tty field of "0" means "no tty" */ + snprintf(buf, size+1, "%u,%u", ps->tty_major, ps->tty_minor); } #if ENABLE_SELINUX |