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diff --git a/lib/libsys/Makefile.sys b/lib/libsys/Makefile.sys
--- a/lib/libsys/Makefile.sys
+++ b/lib/libsys/Makefile.sys
@@ -1,5 +1,20 @@
-
-# sys sources
+# Implement symbols common to libc and libsys.
+#
+# When dynamically linked, the libc symbols are filtered by the actual
+# implementations in libsys. When statically linked, both libc and
+# libsys contain full implementations to preserve the API of libc.a.
+#
+# The following variable are programmer-defined:
+#
+# MDASM Override the default syscall implementation in MIASM
+# (from syscall.mk below). Each entry is a source file
+# name (e.g., vfork.S).
+# Generally defined in <arch>/Makefile.sys.
+# PSEUDO Generate _<sys> and __sys_<sys> symbols, but not <sys>.
+# Each entry is a bare syscall name (e.g., "clock_gettime").
+# INTERPOSED Like PSEUDO, but <sys>.c is added to SRCS.
+# Used for syscalls intercepted by the threading library.
+#
.PATH: ${LIBSYS_SRCTOP}/${LIBC_ARCH} ${LIBSYS_SRCTOP}
# Include the generated makefile containing the *complete* list
@@ -7,10 +22,6 @@
.include "${SRCTOP}/sys/sys/syscall.mk"
# Include machine dependent definitions.
-#
-# MDASM names override the default syscall names in MIASM.
-# PSEUDO generates _<sys>() and __sys_<sys>() symbols, but not <sys>().
-#
.include "${LIBSYS_SRCTOP}/${LIBC_ARCH}/Makefile.sys"
.if ${LIBC_ARCH} == "i386" || ${LIBC_ARCH} == "amd64"
.include "${LIBSYS_SRCTOP}/x86/Makefile.sys"
@@ -50,11 +61,11 @@
.endif
PSEUDO= \
- _clock_gettime.o \
- _exit.o \
- _getlogin.o \
- _gettimeofday.o \
- _sched_getcpu.o
+ clock_gettime \
+ exit \
+ getlogin \
+ gettimeofday \
+ sched_getcpu
INTERPOSED = \
accept \
@@ -98,7 +109,7 @@
writev
SRCS+= ${INTERPOSED:S/$/.c/}
-PSEUDO+= ${INTERPOSED:C/^.*$/_&.o/}
+PSEUDO+= ${INTERPOSED}
# Add machine dependent asm sources:
SRCS+=${MDASM}
@@ -108,14 +119,14 @@
# without a trival <sys> symbol (PSEUDO). Add each syscall that satisfies
# these conditions to the ASM list.
.for _asm in ${MIASM}
-.if !${MDASM:R:M${_asm:R}} && !${PSEUDO:R:M_${_asm:R}}
+.if !${MDASM:R:M${_asm:R}} && !${PSEUDO:M${_asm:R}}
ASM+=$(_asm)
.endif
.endfor
SASM= ${ASM:S/.o/.S/}
-SPSEUDO= ${PSEUDO:S/.o/.S/}
+SPSEUDO= ${PSEUDO:C/^.*$/_&.S/}
SRCS+= ${SASM} ${SPSEUDO}

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