Add the `-O emul' format option, which prints the name of the system-call

emulation environment the process is in.  "emul" as a keyword is picked
up from OpenBSD.

PR:		bin/65803
Submitted by:	Cyrille Lefevre

3 files changed, 13 insertions, 0 deletions

diff --git a/bin/ps/extern.h b/bin/ps/extern.h
index ca12a79..3642fc9 100644
--- a/bin/ps/extern.h
+++ b/bin/ps/extern.h
@@ -48,6 +48,7 @@ void	 command(KINFO *, VARENT *);
 void	 cputime(KINFO *, VARENT *);
 int	 donlist(void);
 void	 elapsed(KINFO *, VARENT *);
+void	 emulname(KINFO *, VARENT *);
 VARENT	*find_varentry(VAR *);
 const	 char *fmt_argv(char **, char *, size_t);
 double	 getpcpu(const KINFO *);
diff --git a/bin/ps/keyword.c b/bin/ps/keyword.c
index f5aa959..6764b90 100644
--- a/bin/ps/keyword.c
+++ b/bin/ps/keyword.c
@@ -57,6 +57,7 @@ static int  vcmp(const void *, const void *);
 #define	KOFF(x)	offsetof(struct kinfo_proc, x)
 #define	ROFF(x)	offsetof(struct rusage, x)
 
+#define	EMULLEN	13		/* enough for "FreeBSD ELF32" */
 #define	LWPFMT	"d"
 #define	LWPLEN	6
 #define	NLWPFMT	"d"
@@ -85,6 +86,8 @@ static VAR var[] = {
 	{"cpu", "CPU", NULL, 0, kvar, NULL, 3, KOFF(ki_estcpu), UINT, "d",
 		0},
 	{"cputime", "", "time", 0, NULL, NULL, 0, 0, CHAR, NULL, 0},
+	{"emul", "EMUL", NULL, LJUST, emulname, NULL, EMULLEN, 0, CHAR,
+		NULL, 0},
 	{"etime", "ELAPSED", NULL, USER, elapsed, NULL, 12, 0, CHAR, NULL, 0},
 	{"f", "F", NULL, 0, kvar, NULL, 7, KOFF(ki_flag), INT, "x", 0},
 	{"flags", "", "f", 0, NULL, NULL, 0, 0, CHAR, NULL, 0},
diff --git a/bin/ps/print.c b/bin/ps/print.c
index 76e29ab..01e7e1c 100644
--- a/bin/ps/print.c
+++ b/bin/ps/print.c
@@ -750,6 +750,15 @@ rvar(KINFO *k, VARENT *ve)
 }
 
 void
+emulname(KINFO *k, VARENT *ve)
+{
+	VAR *v;
+
+	v = ve->var;
+	printf("%-*s", v->width, *k->ki_p->ki_emul ? k->ki_p->ki_emul : "-");
+}
+
+void
 label(KINFO *k, VARENT *ve)
 {
 	char *string;