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truss: Fix display of shm_open(SHM_ANON, ...).

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Currently truss(1) shows shm_open(SHM_ANON, ...) as shm_open("(null)", ...).
Detect the special value and display it by name.

Reviewed by:    jhb, allanjude, tuexen
Approved by:    mjg (mentor)
MFC with:       r339224
Differential Revision:  https://reviews.freebsd.org/D17461
This commit is contained in:
Thomas Munro 2018-10-28 10:59:49 +00:00
parent c964e17bfe
commit 5b05dc5a8b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=339840
2 changed files with 10 additions and 1 deletions
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1
usr.bin/truss/syscall.h
View File

@ -151,6 +151,7 @@ enum Argtype {
PQuadHex,
PUInt,
Readlinkres,
ShmName,
StringArray,
/* Pointers to structures. */

10
usr.bin/truss/syscalls.c
View File

@ -44,6 +44,7 @@ __FBSDID("$FreeBSD$");
#define _WANT_FREEBSD11_KEVENT
#include <sys/event.h>
#include <sys/ioccom.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/ptrace.h>
#include <sys/resource.h>
@ -462,7 +463,7 @@ static struct syscall decoded_syscalls[] = {
.args = { { Int, 0 }, { Sockoptlevel, 1 }, { Sockoptname, 2 },
{ Ptr | IN, 3 }, { Socklent, 4 } } },
{ .name = "shm_open", .ret_type = 1, .nargs = 3,
.args = { { Name | IN, 0 }, { Open, 1 }, { Octal, 2 } } },
.args = { { ShmName | IN, 0 }, { Open, 1 }, { Octal, 2 } } },
{ .name = "shm_unlink", .ret_type = 1, .nargs = 1,
.args = { { Name | IN, 0 } } },
{ .name = "shutdown", .ret_type = 1, .nargs = 2,
@ -1593,6 +1594,13 @@ print_arg(struct syscall_args *sc, unsigned long *args, long *retval,
case Sizet:
fprintf(fp, "%zu", (size_t)args[sc->offset]);
break;
case ShmName:
/* Handle special SHM_ANON value. */
if ((char *)args[sc->offset] == SHM_ANON) {
fprintf(fp, "SHM_ANON");
break;
}
/* FALLTHROUGH */
case Name: {
/* NULL-terminated string. */
char *tmp2;