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-rw-r--r--src/libposixplz/setgroups.c50
1 files changed, 50 insertions, 0 deletions
diff --git a/src/libposixplz/setgroups.c b/src/libposixplz/setgroups.c
new file mode 100644
index 0000000..d064ed2
--- /dev/null
+++ b/src/libposixplz/setgroups.c
@@ -0,0 +1,50 @@
+/* ISC license. */
+
+#include <skalibs/sysdeps.h>
+
+#ifdef SKALIBS_HASSETGROUPS
+
+#include <skalibs/nonposix.h>
+#include <string.h>
+#include <unistd.h>
+#include <grp.h>
+#include <skalibs/setgroups.h>
+
+int setgroups_and_gid (gid_t g, size_t n, gid_t const *tab)
+{
+ size_t i = 1 ;
+ if (!n) return setgroups(1, &g) ;
+ if (tab[0] == g) return setgroups(n, tab) ;
+ for (; i < n ; i++) if (tab[i] == g) break ;
+ if (i < n)
+ {
+ gid_t newtab[n] ;
+ newtab[0] = g ;
+ memcpy(newtab + 1, tab, i * sizeof(gid_t)) ;
+ memcpy(newtab + i + 1, tab + i + 1, (n - i - 1) * sizeof(gid_t)) ;
+ return setgroups(n, newtab) ;
+ }
+ else
+ {
+ gid_t newtab[n+1] ;
+ newtab[0] = g ;
+ memcpy(newtab + 1, tab, n * sizeof(gid_t)) ;
+ return setgroups(n+1, newtab) ;
+ }
+}
+
+int setgroups_with_egid (size_t n, gid_t const *tab)
+{
+ return setgroups_and_gid(getegid(), n, tab) ;
+}
+
+int skalibs_setgroups (size_t n, gid_t const *tab)
+{
+#ifdef SKALIBS_BSD_SUCKS
+ return setgroups_with_egid(n, tab) ;
+#else
+ return setgroups(n, tab) ;
+#endif
+}
+
+#endif