diff options
Diffstat (limited to 'lib/libc/sys')
| -rw-r--r-- | lib/libc/sys/ktrace.2 | 35 |
1 files changed, 16 insertions, 19 deletions
diff --git a/lib/libc/sys/ktrace.2 b/lib/libc/sys/ktrace.2 index 467734f164d..594a3591334 100644 --- a/lib/libc/sys/ktrace.2 +++ b/lib/libc/sys/ktrace.2 @@ -1,4 +1,4 @@ -.\" $OpenBSD: ktrace.2,v 1.21 2011/09/03 22:59:07 jmc Exp $ +.\" $OpenBSD: ktrace.2,v 1.22 2012/11/29 02:35:04 guenther Exp $ .\" $NetBSD: ktrace.2,v 1.2 1995/02/27 12:33:58 cgd Exp $ .\" .\" Copyright (c) 1993 @@ -30,7 +30,7 @@ .\" .\" @(#)ktrace.2 8.1 (Berkeley) 6/4/93 .\" -.Dd $Mdocdate: September 3 2011 $ +.Dd $Mdocdate: November 29 2012 $ .Dt KTRACE 2 .Os .Sh NAME @@ -114,17 +114,23 @@ Trace various structs Inherit tracing to future children. .El .Pp +The +.Fa pid +parameter refers to a process ID. +If it is negative, +it refers to a process group ID. +.Pp Each tracing event outputs a record composed of a generic header followed by a trace point specific structure. The generic header is: .Bd -literal struct ktr_header { - size_t ktr_len; /* length of buf */ + uint ktr_type; /* trace record type */ pid_t ktr_pid; /* process id */ + pid_t ktr_tid; /* thread id */ + struct timespec ktr_time; /* timestamp */ char ktr_comm[MAXCOMLEN+1]; /* command name */ - short ktr_type; /* trace record type */ - struct timeval ktr_time; /* timestamp */ - caddr_t ktr_buf; + size_t ktr_len; /* length of buf */ }; .Ed .Pp @@ -134,17 +140,14 @@ field specifies the length of the .Fa ktr_type data that follows this header. The -.Fa ktr_pid +.Fa ktr_pid , ktr_tid , and .Fa ktr_comm -fields specify the process and command generating the record. +fields specify the process, thread, and command generating the record. The .Fa ktr_time -field gives the time (with microsecond resolution) +field gives the time (with nanosecond resolution) that the record was generated. -The -.Fa ktr_buf -is an internal kernel pointer and is not useful. .Pp The generic header is followed by .Fa ktr_len @@ -154,12 +157,6 @@ record. The type specific records are defined in the .Aq Pa sys/ktrace.h include file. -.Pp -The -.Fa pid -parameter refers to a process ID. -If it is negative, -it refers to a process group ID. .Sh RETURN VALUES On successful completion a value of 0 is returned. Otherwise, a value of \-1 is returned and @@ -172,7 +169,7 @@ will fail if: .It Bq Er ENOTDIR A component of the path prefix is not a directory. .It Bq Er EINVAL -The pathname contains a character with the high-order bit set. +No trace points were selected. .It Bq Er ENAMETOOLONG A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters. |