Add getnucred system call. Contributed by Thomas Cort

include/minix/com.h

@@ -876,6 +876,9 @@
 #define PM_ENDPT				m1_i1
 #define PM_PENDPT				m1_i2
 
+#define PM_NUID					m2_i1
+#define PM_NGID					m2_i2
+
 /* Field names for GETSYSINFO_UP (PM). */
 #define SIU_WHAT	m2_i1
 #define SIU_LEN		m2_i2

lib/libc/other/Makefile.inc

@@ -13,6 +13,7 @@ SRCS+=  \
 	_getdents.c \
 	_getdma.c \
 	_getnpid.c \
+	_getnucred.c \
 	_getnuid.c \
 	_getngid.c \
 	_getnprocnr.c \

lib/libc/other/_getnucred.c

@@ -0,0 +1,29 @@
+#include <lib.h>
+#define getnucred	_getnucred
+#include <errno.h>
+#include <sys/ucred.h>
+#include <unistd.h>
+
+PUBLIC int getnucred(endpoint_t proc_ep, struct ucred *ucred)
+{
+  message m;
+  pid_t pid;
+
+  if (ucred == NULL) {
+    errno = EFAULT;
+    return -1;
+  }
+
+  m.m1_i1 = proc_ep;		/* search for this process */
+
+  pid = _syscall(PM_PROC_NR, GETEPINFO, &m);
+  if (pid < 0) {
+     return -1;
+  }
+
+  ucred->pid = pid;
+  ucred->uid = m.PM_NUID;
+  ucred->gid = m.PM_NGID;
+
+  return 0;
+}

lib/libc/syscall/Makefile.inc

@@ -46,6 +46,7 @@ SRCS+=  \
 	getgroups.S \
 	getitimer.S \
 	getnpid.S \
+	getnucred.S \
 	getnuid.S \
 	getngid.S \
 	getnprocnr.S \

lib/libc/syscall/getnucred.S

@@ -0,0 +1,7 @@
+.text
+.extern	__getnucred
+.globl	_getnucred
+.balign	2
+
+_getnucred:
+	jmp	__getnucred