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Clarify discussion of feature test macros that are needed to 

expose Sysem V and BSD versions of this function in glibc.
This commit is contained in:
Michael Kerrisk 2007-05-27 16:10:33 +00:00
parent 2addd91025
commit 98817d8387
1 changed files with 9 additions and 3 deletions
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12
man3/sigpause.3
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@ -68,11 +68,16 @@ function, that takes a
.I "sigset_t *"
parameter (instead of an
.IR int ).
.LP
.SS Linux Notes
On Linux, this routine is a system call only on the Sparc (sparc64)
architecture.
Libc4 and libc5 only know about the BSD version.
Glibc uses the BSD version unless _XOPEN_SOURCE is defined.
Glibc uses the BSD version if the _BSD_SOURCE feature test macro is
defined and none of _POSIX_SOURCE, _POSIX_C_SOURCE, _XOPEN_SOURCE,
_GNU_SOURCE, or _SVID_SOURCE is defined.
The System V version is used if _XOPEN_SOURCE is defined.
.\"
.\" For the BSD version, one usually uses a zero
.\" .I sigmask
@ -83,4 +88,5 @@ Glibc uses the BSD version unless _XOPEN_SOURCE is defined.
.BR sigprocmask (2),
.BR sigsuspend (2),
.BR sigblock (3),
.BR sigvec (3)
.BR sigvec (3),
.BR feature_test_macros (7)