The function getttyent() returns a pointer to the static variable, so it is not thread-safe. The functions setttyent() and endttyent() use a static variable "tf", so they are not thread-safe. The function getttynam() calls unsafe function getttyent(), so it is not thread-safe. Signed-off-by: Peng Haitao <penght@xxxxxxxxxxxxxx> --- man3/getttyent.3 | 19 ++++++++++++++++++- 1 files changed, 18 insertions(+), 1 deletions(-) diff --git a/man3/getttyent.3 b/man3/getttyent.3 index 1cf8ebc..a4e9b17 100644 --- a/man3/getttyent.3 +++ b/man3/getttyent.3 @@ -1,7 +1,7 @@ .\" Copyright 2002 walter harms (walter.harms@xxxxxxxxxxxxxxxxxxxxxxxxxxx) .\" Distributed under GPL .\" -.TH GETTTYENT 3 2002-07-18 "GNU" "Linux Programmer's Manual" +.TH GETTTYENT 3 2011-09-15 "GNU" "Linux Programmer's Manual" .SH NAME getttyent, getttynam, setttyent, endttyent \- get ttys file entry .SH SYNOPSIS @@ -66,6 +66,23 @@ can be: #define TTY_ON 0x01 /* enable logins (start ty_getty program) */ #define TTY_SECURE 0x02 /* allow UID 0 to login */ .fi +.SH ATTRIBUTES +.SS Multithreading (see pthreads(7)) +The +.BR getttyent () +returns a pointer to the static variable, so it is not thread-safe. +.LP +The +.BR setttyent () +and +.BR endttyent () +use a static variable, so they are not thread-safe. +.LP +The +.BR getttynam () +calls thread-unsafe function +.BR getttyent () +so it is not thread-safe. .SH "CONFORMING TO" Not in POSIX.1-2001. Present on the BSDs, and perhaps other systems. -- 1.7.1 -- Best Regards, Peng Haitao -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
