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ps(1): Make '-a' and '-A' always show all processes

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When combined with other options affecting the selection of processes,
except for '-X' and '-x', option '-a' would have no effect (and '-A'
would reduce to just '-x').  This was in contradiction with the rule
applying to all other selection options stating that one process is
listed as soon as any of these options has been specified and selects
it, which is both mandated by POSIX and arguably a natural expectation.

MFC after:      3 days
Sponsored by:   The FreeBSD Foundation
Differential Revision:  https://reviews.freebsd.org/D49617 (code)
Differential Revision:  https://reviews.freebsd.org/D49618 (manual page)

(cherry picked from commit 93a94ce731)
This commit is contained in:
Olivier Certner 2025-03-14 22:42:08 +01:00
parent 1fc8cb547c
commit 1ee62f354a
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GPG key ID: 8CA13040971E2627
2 changed files with 11 additions and 23 deletions
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25
bin/ps/ps.1
View file

@ -80,7 +80,7 @@ and
.Fl x
options.
Except for options
.Fl A , a , X ,
.Fl X
and
.Fl x ,
as soon as one of them appears, it inhibits the default process selection, i.e.,
@ -215,11 +215,6 @@ see
and
.Fl x
.Pc .
Currently, this option has no effect if any other option selecting processes to
display is present, except for
.Fl X
and
.Fl x .
If the
.Va security.bsd.see_other_uids
sysctl is set to zero, this option is honored only if the real user ID of the
@ -965,13 +960,13 @@ which is the current behavior of option
.Pc .
.Pp
However, options
.Fl G , l , o , p ,
.Fl A , a , G , l , o , p ,
and
.Fl t
behave as prescribed by
.St -p1003.1-2024 .
Options
.Fl A , a , f , U ,
.Fl f , U ,
and
.Fl w
currently do not, but may be changed to in the future.
@ -1021,20 +1016,6 @@ implementation (for other BSDs, illumos or Linux) behaves like this.
For all these reasons, the behavior is expected to be changed soon to using the
effective user ID instead.
.Pp
The
.Fl a
option has no effect if other options affecting the selection of processes are
used, except for (non-)filters
.Fl X
and
.Fl x.
Option
.Fl A
has the same restriction.
This idiosyncrasy is both in contradiction with
.St -p1003.1-2024
and arguably with common sense, and is expected to be removed soon.
.Pp
.Nm ps
currently does not correctly limit the ouput width, and in most cases does not
limit it at all when it should.

9
bin/ps/ps.c
View file

@ -528,7 +528,14 @@ main(int argc, char *argv[])
free(keywords_info);
keywords_info = NULL;
if (!all && nselectors == 0) {
if (all)
/*
* We have to display all processes, regardless of other
* options.
*/
nselectors = 0;
else if (nselectors == 0) {
/* Default is to request our processes only. */
uidlist.l.ptr = malloc(sizeof(uid_t));
if (uidlist.l.ptr == NULL)
xo_errx(1, "malloc failed");