[PATCH 03/13] oslib-posix: default exec_dir to bindir

[Paolo Bonzini <pbonzini@redhat.com>]

If the exec_dir cannot be retrieved, just assume it's the installation
directory that was specified at configure time.  This makes it simpler
to reason about what the callers will do if they get back an empty
path.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 meson.build        |  2 +-
 util/oslib-posix.c | 23 ++++++++---------------
 util/oslib-win32.c |  2 ++
 3 files changed, 11 insertions(+), 16 deletions(-)

diff --git a/meson.build b/meson.build
index 93182d36e3..10ab189bc5 100644
--- a/meson.build
+++ b/meson.build
@@ -415,7 +415,7 @@ config_host_data.set('QEMU_VERSION_MINOR', meson.project_version().split('.')[1]
 config_host_data.set('QEMU_VERSION_MICRO', meson.project_version().split('.')[2])
 
 arrays = ['CONFIG_AUDIO_DRIVERS', 'CONFIG_BDRV_RW_WHITELIST', 'CONFIG_BDRV_RO_WHITELIST']
-strings = ['HOST_DSOSUF', 'CONFIG_IASL', 'qemu_confdir', 'qemu_datadir',
+strings = ['HOST_DSOSUF', 'CONFIG_IASL', 'bindir', 'qemu_confdir', 'qemu_datadir',
            'qemu_moddir', 'qemu_localstatedir', 'qemu_helperdir', 'qemu_localedir',
            'qemu_icondir', 'qemu_desktopdir', 'qemu_firmwarepath']
 foreach k, v: config_host
diff --git a/util/oslib-posix.c b/util/oslib-posix.c
index 0dd8d24076..a68fccb52d 100644
--- a/util/oslib-posix.c
+++ b/util/oslib-posix.c
@@ -358,15 +358,14 @@ void qemu_set_tty_echo(int fd, bool echo)
     tcsetattr(fd, TCSANOW, &tty);
 }
 
-static char exec_dir[PATH_MAX];
+static char *exec_dir;
 
 void qemu_init_exec_dir(const char *argv0)
 {
-    char *dir;
     char *p = NULL;
     char buf[PATH_MAX];
 
-    if (exec_dir[0]) {
+    if (exec_dir) {
         return;
     }
 
@@ -425,20 +424,14 @@ void qemu_init_exec_dir(const char *argv0)
 #endif
     /* If we don't have any way of figuring out the actual executable
        location then try argv[0].  */
-    if (!p) {
-        if (!argv0) {
-            return;
-        }
+    if (!p && argv0) {
         p = realpath(argv0, buf);
-        if (!p) {
-            return;
-        }
     }
-    dir = g_path_get_dirname(p);
-
-    pstrcpy(exec_dir, sizeof(exec_dir), dir);
-
-    g_free(dir);
+    if (p) {
+        exec_dir = g_path_get_dirname(p);
+    } else {
+        exec_dir = g_strdup(CONFIG_BINDIR);
+    }
 }
 
 const char *qemu_get_exec_dir(void)
diff --git a/util/oslib-win32.c b/util/oslib-win32.c
index 1a33912944..8d3f940a54 100644
--- a/util/oslib-win32.c
+++ b/util/oslib-win32.c
@@ -341,6 +341,8 @@ void qemu_init_exec_dir(const char *argv0)
     *p = 0;
     if (access(buf, R_OK) == 0) {
         exec_dir = g_strdup(buf);
+    } else {
+        exec_dir = g_strdup(CONFIG_BINDIR);
     }
 }
 
-- 
2.26.2