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Document required size of buffer for elf_aux_info(3).

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PR:	241884
Reported by:	jbeich
Reviewed by:	brooks
Sponsored by:	The FreeBSD Foundation
MFC after:	3 days
Differential revision:	https://reviews.freebsd.org/D22380
This commit is contained in:
Konstantin Belousov 2019-11-17 14:11:08 +00:00
parent d3276301ab
commit 7ce4a1458e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=354787
1 changed files with 23 additions and 11 deletions
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34
lib/libc/gen/auxv.3
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@ -24,7 +24,7 @@
.\" .\"
.\" $FreeBSD$ .\" $FreeBSD$
.\" .\"
.Dd November 13, 2019 .Dd November 17, 2019
.Dt ELF_AUX_INFO 3 .Dt ELF_AUX_INFO 3
.Os .Os
.Sh NAME .Sh NAME
@ -44,29 +44,41 @@ function retrieves the auxiliary info vector requested in
The information is stored into the provided buffer if it will fit. The information is stored into the provided buffer if it will fit.
The following values, defined in The following values, defined in
.In sys/elf_common.h .In sys/elf_common.h
can be requested: can be requested (corresponding buffer sizes are specified in parenthesis):
.Bl -tag -width AT_OSRELDATE .Bl -tag -width AT_OSRELDATE
.It AT_CANARY .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 .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 This may not be present if the process was initialized by
.Xr fexecve 2 .Xr fexecve 2
and the namecache no longer contains the file's name. and the namecache no longer contains the file's name.
.It AT_HWCAP .It AT_HWCAP
CPU / hardware feature flags. CPU / hardware feature flags
.Dv (sizeof(u_long)).
.It AT_HWCAP2 .It AT_HWCAP2
CPU / hardware feature flags. CPU / hardware feature flags
.Dv (sizeof(u_long)).
.It AT_NCPUS .It AT_NCPUS
Number of CPUs. Number of CPUs
.Dv (sizeof(int)).
.It AT_OSRELDATE .It AT_OSRELDATE
Kernel OSRELDATE. The
.Dv OSRELDATE
of the kernel or jail the program is running on
.Dv (sizeof(int)).
.It AT_PAGESIZES .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 .It AT_PAGESZ
Page size in bytes. Page size in bytes
.Dv (sizeof(int)).
.It AT_TIMEKEEP .It AT_TIMEKEEP
Pointer to VDSO timehands (for library internal use). Pointer to VDSO timehands (for library internal use,
.Dv sizeof(void *)).
.El .El
.Sh RETURN VALUES .Sh RETURN VALUES
Returns zero on success, or an error number on failure. Returns zero on success, or an error number on failure.