Use /proc/self/auxv in Solaris to figure out the $^X.

(It seems that "./perl" gets resolved to "perl" now.)

p4raw-id: //depot/perl@13234

1 files changed, 38 insertions, 5 deletions

diff --git a/perl.c b/perl.c
index 5d4e5bbb25..13c7d31581 100644
--- a/perl.c
+++ b/perl.c
@@ -3421,7 +3421,7 @@ Perl_init_argv_symbols(pTHX_ register int argc, register char **argv)
 
 #ifdef HAS_PROCSELFEXE
 /* This is a function so that we don't hold on to MAXPATHLEN
-   bytes of stack longer than necessary
+   bytes of stack longer than necessary.
  */
 STATIC void
 S_procself_val(pTHX_ SV *sv, char *arg0)
@@ -3437,6 +3437,35 @@ S_procself_val(pTHX_ SV *sv, char *arg0)
 }
 #endif /* HAS_PROCSELFEXE */
 
+#if defined(sun) && defined(__svr4__) /* solaris */
+#include <sys/auxv.h>
+STATIC void
+S_procselfauxv(pTHX_ SV *sv, char *arg0) {
+    auxv_t auxv;
+    int fh;
+    int n;
+
+    fh = open("/proc/self/auxv", O_RDONLY);
+    if (fh < 0) {
+        sv_setpv(sv, arg0);
+        return;
+    }
+
+    while (1) {
+        n = read(fh, &auxv, sizeof(auxv));
+        if (n != sizeof(auxv))
+            break;
+        if (auxv.a_type == AT_SUN_EXECNAME) {
+            close(fh);
+            sv_setpv(sv, auxv.a_un.a_ptr);
+	    return;
+        }
+    }
+    close(fh);
+    sv_setpv(sv, arg0);
+}
+#endif /* solaris */
+
 STATIC void
 S_init_postdump_symbols(pTHX_ register int argc, register char **argv, register char **env)
 {
@@ -3473,11 +3502,15 @@ S_init_postdump_symbols(pTHX_ register int argc, register char **argv, register
 #ifdef HAS_PROCSELFEXE
 	S_procself_val(aTHX_ GvSV(tmpgv), PL_origargv[0]);
 #else
-#ifdef OS2
+#   ifdef OS2
 	sv_setpv(GvSV(tmpgv), os2_execname(aTHX));
-#else
-	sv_setpv(GvSV(tmpgv),PL_origargv[0]);
-#endif
+#   else
+#       if defined(sun) && defined(__svr4__) /* solaris */
+	S_procselfauxv(aTHX_ GvSV(tmpgv), PL_origargv[0]);
+#       else
+	sv_setpv(GvSV(tmpgv), PL_origargv[0]);
+#       endif
+#   endif
 #endif
     }
     if ((PL_envgv = gv_fetchpv("ENV",TRUE, SVt_PVHV))) {