date and time created 91/11/12 18:47:23 by mckusick

SCCS-vsn: lib/libc/gen/getgrouplist.c 5.1

diff --git a/usr/src/lib/libc/gen/getgrouplist.c b/usr/src/lib/libc/gen/getgrouplist.c
new file mode 100644 (file)
index 0000000..ebe48c1
--- /dev/null
+++ b/usr/src/lib/libc/gen/getgrouplist.c
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 1991 Regents of the University of California.
+ * All rights reserved.
+ *
+ * %sccs.include.redist.c%
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)getgrouplist.c     5.1 (Berkeley) %G%";
+#endif /* LIBC_SCCS and not lint */
+
+/*
+ * get credential
+ */
+#include <sys/types.h>
+#include <string.h>
+#include <grp.h>
+
+int
+getgrouplist(uname, agroup, groups, grpcnt)
+       const char *uname;
+       int agroup;
+       register int *groups;
+       int *grpcnt;
+{
+       register struct group *grp;
+       register struct passwd *pw;
+       register int i, ngroups;
+       int ret, maxgroups;
+
+       ret = 0;
+       ngroups = 0;
+       maxgroups = *grpcnt;
+       /*
+        * When installing primary group, duplicate it;
+        * the first element of groups is the effective gid
+        * and will be overwritten when a setgid file is executed.
+        */
+       groups[ngroups++] = agroup;
+       if (maxgroups > 1)
+               groups[ngroups++] = agroup;
+       /*
+        * Scan the group file to find additional groups.
+        */
+       setgrent();
+       while (grp = getgrent()) {
+               if (grp->gr_gid == agroup)
+                       continue;
+               if (ngroups >= maxgroups) {
+                       ret = -1;
+                       break;
+               }
+               for (i = 0; grp->gr_mem[i]; i++) {
+                       if (!strcmp(grp->gr_mem[i], uname)) {
+                               groups[ngroups++] = grp->gr_gid;
+                               break;
+                       }
+               }
+       }
+       endgrent();
+       *grpcnt = ngroups;
+       return (ret);
+}