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Index: head/lib/libc/gen/auxv.3
===================================================================
--- head/lib/libc/gen/auxv.3
+++ head/lib/libc/gen/auxv.3
@@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd November 13, 2019
+.Dd November 17, 2019
.Dt ELF_AUX_INFO 3
.Os
.Sh NAME
@@ -44,29 +44,41 @@
The information is stored into the provided buffer if it will fit.
The following values, defined in
.In sys/elf_common.h
-can be requested:
+can be requested (corresponding buffer sizes are specified in parenthesis):
.Bl -tag -width AT_OSRELDATE
.It AT_CANARY
-The canary value for SSP.
+The canary value for SSP (arbitrary sized buffer, as many bytes are
+returned as it fits into it, rest is zeroed).
.It AT_EXECPATH
-The path of executed program.
+The path of executed program
+.Dv (MAXPATHLEN).
This may not be present if the process was initialized by
.Xr fexecve 2
and the namecache no longer contains the file's name.
.It AT_HWCAP
-CPU / hardware feature flags.
+CPU / hardware feature flags
+.Dv (sizeof(u_long)).
.It AT_HWCAP2
-CPU / hardware feature flags.
+CPU / hardware feature flags
+.Dv (sizeof(u_long)).
.It AT_NCPUS
-Number of CPUs.
+Number of CPUs
+.Dv (sizeof(int)).
.It AT_OSRELDATE
-Kernel OSRELDATE.
+The
+.Dv OSRELDATE
+of the kernel or jail the program is running on
+.Dv (sizeof(int)).
.It AT_PAGESIZES
-Vector of page sizes.
+Vector of page sizes (arbitrary sized buffer, as many elements of the
+.Dv pagesizes
+array are returned as it fits).
.It AT_PAGESZ
-Page size in bytes.
+Page size in bytes
+.Dv (sizeof(int)).
.It AT_TIMEKEEP
-Pointer to VDSO timehands (for library internal use).
+Pointer to VDSO timehands (for library internal use,
+.Dv sizeof(void *)).
.El
.Sh RETURN VALUES
Returns zero on success, or an error number on failure.

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