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dlinfo.3: Document the RTLD_DI_PHDR request

PATCH Superseded Florian Weimer 2 participants 3 messages Aug 28, 2024 Man-pages: manual pages for Linux -- Sections 2, 3, 4, 5, and 7

v1 of 2 Superseded Latest is v2 →

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PATCH 1/1 dlinfo.3: Document the RTLD_DI_PHDR request

First added in glibc 2.36, backported upstream to glibc 2.34, so mention 2.34.1 for the first version.

---
 man/man3/dlinfo.3 | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)
man/man3/dlinfo.3 +14 -1
index 84b696f8c..8d61f81e8 100644
@@ -194,10 +194,23 @@ If this object does not define a PT_TLS segment,
 or if the calling thread has not allocated a block for it,
 NULL is placed in
 .IR *info .
+.TP
+.BR RTLD_DI_PHDR " (\fIconst ElfW(Phdr *)\fP, since glibc 2.34.1)"
+.\" glibc commit d056c212130280c0a54d9a4f72170ec621b70ce5 (2.36)
+.\" glibc commit d056c212130280c0a54d9a4f72170ec621b70ce5 (2.35)
+.\" glibc commit 91c2e6c3db44297bf4cb3a2e3c40236c5b6a0b23 (2.34)
+Obtain the address of this shared object's program header and place it
+in
+.IR *info .
+This
+.B dlinfo
+call returns the number of program headers in the shared object.
 .SH RETURN VALUE
 On success,
 .BR dlinfo ()
-returns 0.
+returns 0
+(if not specified explicitly),
+or a positive value corresponding to the request.
 On failure, it returns \-1; the error can be diagnosed using
 .BR dlerror (3).
 .SH ATTRIBUTES

base-commit: 6a7f1461b0e5474d50ef1920558dec103c0c058f

#1 lore raw

Hi Florian,

Quoted 14 lines · Florian Weimer

First added in glibc 2.36, backported upstream to glibc 2.34, so mention 2.34.1 for the first version.

---
 man/man3/dlinfo.3 | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)
man/man3/dlinfo.3 +0 -0
index 84b696f8c..8d61f81e8 100644

man/man3/dlinfo.3 If this object does not define a PT_TLS segment, · line 201

Quoted 8 lines
man/man3/dlinfo.3 +5 -0
@@ -194,10 +194,23 @@ If this object does not define a PT_TLS segment,
 or if the calling thread has not allocated a block for it,
 NULL is placed in
 .IR *info .
+.TP
+.BR RTLD_DI_PHDR " (\fIconst ElfW(Phdr *)\fP, since glibc 2.34.1)"
+.\" glibc commit d056c212130280c0a54d9a4f72170ec621b70ce5 (2.36)
+.\" glibc commit d056c212130280c0a54d9a4f72170ec621b70ce5 (2.35)
+.\" glibc commit 91c2e6c3db44297bf4cb3a2e3c40236c5b6a0b23 (2.34)

I think the two above should say 2.35.1 and 2.34.1. (I'm assuming it's 2.35.1, can you confirm?)

Have a lovely day!
Alex

Quoted 19 lines
man/man3/dlinfo.3 +9 -1
+Obtain the address of this shared object's program header and place it
+in
+.IR *info .
+This
+.B dlinfo
+call returns the number of program headers in the shared object.
 .SH RETURN VALUE
 On success,
 .BR dlinfo ()
-returns 0.
+returns 0
+(if not specified explicitly),
+or a positive value corresponding to the request.
 On failure, it returns \-1; the error can be diagnosed using
 .BR dlerror (3).
 .SH ATTRIBUTES

base-commit: 6a7f1461b0e5474d50ef1920558dec103c0c058f

Signature · 1 line
<https://www.alejandro-colomar.es/>
#2 lore raw

* Alejandro Colomar:

Quoted 10 lines · Florian Weimer
Quoted 9 lines

First added in glibc 2.36, backported upstream to glibc 2.34, so mention 2.34.1 for the first version.

---
 man/man3/dlinfo.3 | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)
Quoted 16 lines

man/man3/dlinfo.3 If this object does not define a PT_TLS segment, · line 201

Quoted 13 lines
man/man3/dlinfo.3 +5 -0
index 84b696f8c..8d61f81e8 100644
@@ -194,10 +194,23 @@ If this object does not define a PT_TLS segment,
 or if the calling thread has not allocated a block for it,
 NULL is placed in
 .IR *info .
+.TP
+.BR RTLD_DI_PHDR " (\fIconst ElfW(Phdr *)\fP, since glibc 2.34.1)"
+.\" glibc commit d056c212130280c0a54d9a4f72170ec621b70ce5 (2.36)
+.\" glibc commit d056c212130280c0a54d9a4f72170ec621b70ce5 (2.35)
+.\" glibc commit 91c2e6c3db44297bf4cb3a2e3c40236c5b6a0b23 (2.34)

I think the two above should say 2.35.1 and 2.34.1. (I'm assuming it's 2.35.1, can you confirm?)

Sure, will re-check and fix as appropriate.

Thanks,
Florian