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mmap.2: NOTES: add "C library/kernel ABI differences" subheading 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2014-05-15 22:40:36 +02:00
parent de76572d12
commit 35c189fbd6
1 changed files with 16 additions and 15 deletions
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man2/mmap.2
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@ -511,21 +511,6 @@ is defined in \fI<unistd.h>\fP to a value greater than 0.
.\" -1: unavailable, 0: ask using sysconf().
.\" glibc defines it to 1.
.SH NOTES
This page describes the interface provided by the glibc
.BR mmap ()
wrapper function.
Originally, this function invoked a system call of the same name.
Since kernel 2.4, that system call has been superseded by
.BR mmap2 (2),
and nowadays
.\" Since around glibc 2.1/2.2, depending on the platform.
the glibc
.BR mmap ()
wrapper function invokes
.BR mmap2 (2)
with a suitably adjusted value for
.IR offset .
On some hardware architectures (e.g., i386),
.B PROT_WRITE
implies
@ -582,6 +567,22 @@ The relevant flags are:
.BR MAP_POPULATE ,
and
.BR MAP_STACK .
.\"
.SS C library/kernel ABI differences
This page describes the interface provided by the glibc
.BR mmap ()
wrapper function.
Originally, this function invoked a system call of the same name.
Since kernel 2.4, that system call has been superseded by
.BR mmap2 (2),
and nowadays
.\" Since around glibc 2.1/2.2, depending on the platform.
the glibc
.BR mmap ()
wrapper function invokes
.BR mmap2 (2)
with a suitably adjusted value for
.IR offset .
.SH BUGS
On Linux there are no guarantees like those suggested above under
.BR MAP_NORESERVE .