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[libc-amd64-linux] Add more syscalls

These syscalls are going to be needed for raise()
and for signal()

--- a/libc/src/sys/amd64-linux/Makefile

+++ b/libc/src/sys/amd64-linux/Makefile

@@ -3,8 +3,11 @@

 include ../../../../config.mk

-OBJ = _brk.o _close.o _exit.o _lseek.o _open.o _read.o _write.o

-SRC = $(OBJ:.o=.s)

+OBJ_GEN = _read.o _write.o _open.o _close.o _lseek.o _brk.o\

+          _rt_sigaction.o _getpid.o _exit.o _kill.o

+

+ASM_GEN = $(OBJ_GEN:.o=.s)

+OBJ = $(OBJ_GEN)

 all: $(OBJ)

--- a/libc/src/sys/amd64-linux/syscall.lst

+++ b/libc/src/sys/amd64-linux/syscall.lst

@@ -1,4 +1,4 @@

-#number	#name

+#number	name

 0	_read

 1	_write

 2	_open

@@ -5,4 +5,7 @@

 3	_close

 3	_lseek

 12	_brk

+13	_rt_sigaction

+38	_getpid

 60	_exit

+32	_kill