commit 47ffb905f363571072faefbd417938e7ff351a9f
author Bram Moolenaar <Bram@vim.org> Sun Mar 12 18:38:02 2017 +0100
committer Bram Moolenaar <Bram@vim.org> Sun Mar 12 18:38:02 2017 +0100
tree e5b758ca24a59efa72246dd742e9d508c3add5f7
parent abb4d5f73fd97d8f3c3e32311959929820e74b54

patch 8.0.0450: v:progpath is not reliably set

Problem:    v:progpath is not reliably set.
Solution:   Read /proc/self/exe if possible. (idea by Michal Grochmal)
            Also fixes missing #if.

src/config.h.in

diff --git a/src/config.h.in b/src/config.h.in
index 49ed596..a9bcf1e 100644
--- a/src/config.h.in
+++ b/src/config.h.in
@@ -446,6 +446,9 @@
 /* Define if fcntl()'s F_SETFD command knows about FD_CLOEXEC */
 #undef HAVE_FD_CLOEXEC
 
+/* Define if /proc/self/exe can be read */
+#undef HAVE_PROC_SELF_EXE
+
 /* Define if you want Cygwin to use the WIN32 clipboard, not compatible with X11*/
 #undef FEAT_CYGWIN_WIN32_CLIPBOARD
 

src/main.c

diff --git a/src/main.c b/src/main.c
index f96bca9..aa5a1a2 100644
--- a/src/main.c
+++ b/src/main.c
@@ -3539,16 +3539,27 @@
 {
     char_u *val = argv0;
 
+# ifdef HAVE_PROC_SELF_EXE
+    char    buf[PATH_MAX + 1];
+    ssize_t len;
+
+    len = readlink("/proc/self/exe", buf, PATH_MAX);
+    if (len > 0)
+    {
+	buf[len] = NUL;
+	val = (char_u *)buf;
+    }
+# else
     /* A relative path containing a "/" will become invalid when using ":cd",
      * turn it into a full path.
      * On MS-Windows "vim" should be expanded to "vim.exe", thus always do
      * this. */
-# ifdef WIN32
+#  ifdef WIN32
     char_u *path = NULL;
 
     if (mch_can_exe(argv0, &path, FALSE) && path != NULL)
 	val = path;
-# else
+#  else
     char_u buf[MAXPATHL];
 
     if (!mch_isFullName(argv0))

src/version.c

diff --git a/src/version.c b/src/version.c
index 54df706..257cba1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    450,
+/**/
     449,
 /**/
     448,