getpeuid implementation. Get the uid of a process (by endpoint)

include/minix/callnr.h

@@ -95,6 +95,7 @@
 #if 0
 #define FREEMEM		106	/* to PM, not used, not implemented */
 #endif
+#define GETPUID		107	/* to PM: get the uid of a process (endpoint) */
 
 #define DEVCTL		120	/* to FS, map or unmap a device */
 #define TASK_REPLY	121	/* to FS: reply code from drivers, not 

include/unistd.h

@@ -198,6 +198,7 @@ _PROTOTYPE( int freemem, (phys_bytes size, phys_bytes base)		);
 #define unmapdriver(device) devctl(DEV_UNMAP, 0, device, 0)
 _PROTOTYPE( int devctl, (int ctl_req, int driver, int device, int style, 
 	int force)							);
+_PROTOTYPE( uid_t getpeuid, (endpoint_t ep)				);
 
 /* For compatibility with other Unix systems */
 _PROTOTYPE( int getpagesize, (void)					);

lib/other/Makefile.in

@@ -44,6 +44,7 @@ libc_FILES=" \
 	getlogin.c \
 	getpagesize.c \
 	getpass.c \
+	getpeuid.c \
 	getpwent.c \
 	getttyent.c \
 	getw.c \

lib/other/getpeuid.c

@@ -0,0 +1,12 @@
+#include <lib.h>
+#include <unistd.h>
+
+PUBLIC uid_t getpeuid(ep)
+endpoint_t ep;
+{
+  message m;
+
+  m.m1_i1= ep;
+  if (_syscall(MM, GETPUID, &m) < 0) return ( (uid_t) -1);
+  return( (uid_t) m.m2_i1);
+}

servers/pm/main.c

@@ -119,6 +119,9 @@ PUBLIC int main()
 	case GETPROCNR:
 		result= do_getprocnr();
 		break;
+	case GETPUID:
+		result= do_getpuid();
+		break;
 	default:
 		/* Else, if the system call number is valid, perform the
 		 * call.

servers/pm/misc.c

@@ -5,6 +5,7 @@
  *   do_procstat: request process status  (Jorrit N. Herder)
  *   do_getsysinfo: request copy of PM data structure  (Jorrit N. Herder)
  *   do_getprocnr: lookup process slot number  (Jorrit N. Herder)
+ *   do_getpuid: get the uid/euid of a process given it's endpoint
  *   do_allocmem: allocate a chunk of memory  (Jorrit N. Herder)
  *   do_freemem: deallocate a chunk of memory  (Jorrit N. Herder)
  *   do_getsetpriority: get/set process priority
@@ -358,6 +359,35 @@ PUBLIC int do_getprocnr()
   return(OK);
 }
 
+/*===========================================================================*
+ *				do_getpuid			             *
+ *===========================================================================*/
+PUBLIC int do_getpuid()
+{
+  register struct mproc *rmp;
+  endpoint_t ep;
+
+  /* This call should be moved to DS. */
+  if (mp->mp_effuid != 0)
+  {
+	printf("PM: unauthorized call of do_getpuid by proc %d\n",
+		mp->mp_endpoint);
+	return EPERM;
+  }
+
+  ep= m_in.endpt;
+
+  for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++) {
+	if ((rmp->mp_flags & IN_USE) && (rmp->mp_endpoint == ep)) {
+		mp->mp_reply.reply_res2 = rmp->mp_effuid;
+		return(rmp->mp_realuid);
+	}
+  } 
+
+  /* Process not found */
+  return(ESRCH);			
+}
+
 /*===========================================================================*
  *				do_reboot				     *
  *===========================================================================*/

servers/pm/proto.h

@@ -68,6 +68,7 @@ _PROTOTYPE( int do_sysuname, (void)					);
 _PROTOTYPE( int do_getsysinfo, (void)					);
 _PROTOTYPE( int do_getsysinfo_up, (void)					);
 _PROTOTYPE( int do_getprocnr, (void)					);
+_PROTOTYPE( int do_getpuid, (void)					);
 _PROTOTYPE( int do_svrctl, (void)					);
 _PROTOTYPE( int do_allocmem, (void)					);
 _PROTOTYPE( int do_freemem, (void)					);