diff options
Diffstat (limited to 'doc/autoconf.texi')
| -rw-r--r-- | doc/autoconf.texi | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/doc/autoconf.texi b/doc/autoconf.texi index e8abc9ff..9ba182af 100644 --- a/doc/autoconf.texi +++ b/doc/autoconf.texi @@ -5599,13 +5599,17 @@ If @code{setpgrp} takes no argument (the Posix version), define @code{SETPGRP_VOID}. Otherwise, it is the BSD version, which takes two process IDs as arguments. This macro does not check whether @code{setpgrp} exists at all; if you need to work in that situation, -first call @code{AC_CHECK_FUNC} for @code{setpgrp}. +first call @code{AC_CHECK_FUNC} for @code{setpgrp}. This macro also +does not check for the Solaris variant of @code{setpgrp}, which returns +a @code{pid_t} instead of an @code{int}; portable code should only use +the return value by comparing it against @code{-1} to check for errors. The result of this macro is cached in the @code{ac_cv_func_setpgrp_void} variable. -This macro is obsolescent, as current systems have a @code{setpgrp} -whose signature conforms to Posix. New programs need not use this macro. +This macro is obsolescent, as all forms of @code{setpgrp} are also +obsolescent. New programs should use the Posix function @code{setpgid}, +which takes two process IDs as arguments (like the BSD @code{setpgrp}). @end defmac @defmac AC_FUNC_STAT |