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setreuid.2: Add NOTES explaining 32-bit system calls added in Linux 2.4

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Michael Kerrisk 2010-11-22 08:49:52 +01:00
parent 6dc1520bfb
commit ee3b2c7697
1 changed files with 17 additions and 1 deletions
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man2/setreuid.2
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@ -40,7 +40,7 @@
.\" 2004-07-04 by aeb
.\" 2004-05-27 by Michael Kerrisk
.\"
.TH SETREUID 2 2010-09-20 "Linux" "Linux Programmer's Manual"
.TH SETREUID 2 2010-11-22 "Linux" "Linux Programmer's Manual"
.SH NAME
setreuid, setregid \- set real and/or effective user or group ID
.SH SYNOPSIS
@ -138,6 +138,22 @@ across implementations.
POSIX.1 makes no specification about the effect of these calls
on the saved set-user-ID and saved set-group-ID.
The original Linux
.BR setreuid ()
and
.BR setregid ()
system calls supported only 16-bit user and group IDs.
Subsequently, Linux 2.4 added
.BR setreuid32 ()
and
.BR setregid32 (),
supporting 32-bit IDs.
The glibc
.BR setreuid ()
and
.BR setregid ()
wrapper functions transparently deal with the variations across kernel versions.
.SH "SEE ALSO"
.BR getgid (2),
.BR getuid (2),