include: move qemu_*_exec_dir() to cutils

The function is required by get_relocated_path() (already in cutils),
and used by qemu-ga and may be generally useful.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20220525144140.591926-2-marcandre.lureau@redhat.com>

include/qemu/cutils.h

@@ -193,6 +193,13 @@ int uleb128_decode_small(const uint8_t *in, uint32_t *n);
  */
 int qemu_pstrcmp0(const char **str1, const char **str2);
 
+/* Find program directory, and save it for later usage with
+ * qemu_get_exec_dir().
+ * Try OS specific API first, if not working, parse from argv0. */
+void qemu_init_exec_dir(const char *argv0);
+
+/* Get the saved exec dir.  */
+const char *qemu_get_exec_dir(void);
 
 /**
  * get_relocated_path:

include/qemu/osdep.h

@@ -557,14 +557,6 @@ void qemu_set_cloexec(int fd);
  */
 char *qemu_get_local_state_dir(void);
 
-/* Find program directory, and save it for later usage with
- * qemu_get_exec_dir().
- * Try OS specific API first, if not working, parse from argv0. */
-void qemu_init_exec_dir(const char *argv0);
-
-/* Get the saved exec dir.  */
-const char *qemu_get_exec_dir(void);
-
 /**
  * qemu_getauxval:
  * @type: the auxiliary vector key to lookup

qemu-io.c

@@ -16,6 +16,7 @@
 #endif
 
 #include "qemu/help-texts.h"
+#include "qemu/cutils.h"
 #include "qapi/error.h"
 #include "qemu-io.h"
 #include "qemu/error-report.h"

storage-daemon/qemu-storage-daemon.c

@@ -44,6 +44,7 @@
 
 #include "qemu/help-texts.h"
 #include "qemu-version.h"
+#include "qemu/cutils.h"
 #include "qemu/config-file.h"
 #include "qemu/error-report.h"
 #include "qemu/help_option.h"

tests/qtest/fuzz/fuzz.c

@@ -15,6 +15,7 @@
 
 #include <wordexp.h>
 
+#include "qemu/cutils.h"
 #include "qemu/datadir.h"
 #include "sysemu/sysemu.h"
 #include "sysemu/qtest.h"

util/cutils.c

@@ -26,6 +26,15 @@
 #include "qemu/host-utils.h"
 #include <math.h>
 
+#ifdef __FreeBSD__
+#include <sys/sysctl.h>
+#include <sys/user.h>
+#endif
+
+#ifdef __NetBSD__
+#include <sys/sysctl.h>
+#endif
+
 #include "qemu/ctype.h"
 #include "qemu/cutils.h"
 #include "qemu/error-report.h"
@@ -931,6 +940,114 @@ static inline const char *next_component(const char *dir, int *p_len)
     return dir;
 }
 
+static const char *exec_dir;
+
+void qemu_init_exec_dir(const char *argv0)
+{
+#ifdef G_OS_WIN32
+    char *p;
+    char buf[MAX_PATH];
+    DWORD len;
+
+    if (exec_dir) {
+        return;
+    }
+
+    len = GetModuleFileName(NULL, buf, sizeof(buf) - 1);
+    if (len == 0) {
+        return;
+    }
+
+    buf[len] = 0;
+    p = buf + len - 1;
+    while (p != buf && *p != '\\') {
+        p--;
+    }
+    *p = 0;
+    if (access(buf, R_OK) == 0) {
+        exec_dir = g_strdup(buf);
+    } else {
+        exec_dir = CONFIG_BINDIR;
+    }
+#else
+    char *p = NULL;
+    char buf[PATH_MAX];
+
+    if (exec_dir) {
+        return;
+    }
+
+#if defined(__linux__)
+    {
+        int len;
+        len = readlink("/proc/self/exe", buf, sizeof(buf) - 1);
+        if (len > 0) {
+            buf[len] = 0;
+            p = buf;
+        }
+    }
+#elif defined(__FreeBSD__) \
+      || (defined(__NetBSD__) && defined(KERN_PROC_PATHNAME))
+    {
+#if defined(__FreeBSD__)
+        static int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1};
+#else
+        static int mib[4] = {CTL_KERN, KERN_PROC_ARGS, -1, KERN_PROC_PATHNAME};
+#endif
+        size_t len = sizeof(buf) - 1;
+
+        *buf = '\0';
+        if (!sysctl(mib, ARRAY_SIZE(mib), buf, &len, NULL, 0) &&
+            *buf) {
+            buf[sizeof(buf) - 1] = '\0';
+            p = buf;
+        }
+    }
+#elif defined(__APPLE__)
+    {
+        char fpath[PATH_MAX];
+        uint32_t len = sizeof(fpath);
+        if (_NSGetExecutablePath(fpath, &len) == 0) {
+            p = realpath(fpath, buf);
+            if (!p) {
+                return;
+            }
+        }
+    }
+#elif defined(__HAIKU__)
+    {
+        image_info ii;
+        int32_t c = 0;
+
+        *buf = '\0';
+        while (get_next_image_info(0, &c, &ii) == B_OK) {
+            if (ii.type == B_APP_IMAGE) {
+                strncpy(buf, ii.name, sizeof(buf));
+                buf[sizeof(buf) - 1] = 0;
+                p = buf;
+                break;
+            }
+        }
+    }
+#endif
+    /* If we don't have any way of figuring out the actual executable
+       location then try argv[0].  */
+    if (!p && argv0) {
+        p = realpath(argv0, buf);
+    }
+    if (p) {
+        exec_dir = g_path_get_dirname(p);
+    } else {
+        exec_dir = CONFIG_BINDIR;
+    }
+#endif
+}
+
+const char *qemu_get_exec_dir(void)
+{
+    return exec_dir;
+}
+
 char *get_relocated_path(const char *dir)
 {
     size_t prefix_len = strlen(CONFIG_PREFIX);

util/oslib-posix.c

@@ -48,14 +48,13 @@
 #endif
 
 #ifdef __FreeBSD__
-#include <sys/sysctl.h>
-#include <sys/user.h>
 #include <sys/thr.h>
+#include <sys/types.h>
+#include <sys/user.h>
 #include <libutil.h>
 #endif
 
 #ifdef __NetBSD__
-#include <sys/sysctl.h>
 #include <lwp.h>
 #endif
 
@@ -283,87 +282,6 @@ void qemu_set_tty_echo(int fd, bool echo)
     tcsetattr(fd, TCSANOW, &tty);
 }
 
-static const char *exec_dir;
-
-void qemu_init_exec_dir(const char *argv0)
-{
-    char *p = NULL;
-    char buf[PATH_MAX];
-
-    if (exec_dir) {
-        return;
-    }
-
-#if defined(__linux__)
-    {
-        int len;
-        len = readlink("/proc/self/exe", buf, sizeof(buf) - 1);
-        if (len > 0) {
-            buf[len] = 0;
-            p = buf;
-        }
-    }
-#elif defined(__FreeBSD__) \
-      || (defined(__NetBSD__) && defined(KERN_PROC_PATHNAME))
-    {
-#if defined(__FreeBSD__)
-        static int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1};
-#else
-        static int mib[4] = {CTL_KERN, KERN_PROC_ARGS, -1, KERN_PROC_PATHNAME};
-#endif
-        size_t len = sizeof(buf) - 1;
-
-        *buf = '\0';
-        if (!sysctl(mib, ARRAY_SIZE(mib), buf, &len, NULL, 0) &&
-            *buf) {
-            buf[sizeof(buf) - 1] = '\0';
-            p = buf;
-        }
-    }
-#elif defined(__APPLE__)
-    {
-        char fpath[PATH_MAX];
-        uint32_t len = sizeof(fpath);
-        if (_NSGetExecutablePath(fpath, &len) == 0) {
-            p = realpath(fpath, buf);
-            if (!p) {
-                return;
-            }
-        }
-    }
-#elif defined(__HAIKU__)
-    {
-        image_info ii;
-        int32_t c = 0;
-
-        *buf = '\0';
-        while (get_next_image_info(0, &c, &ii) == B_OK) {
-            if (ii.type == B_APP_IMAGE) {
-                strncpy(buf, ii.name, sizeof(buf));
-                buf[sizeof(buf) - 1] = 0;
-                p = buf;
-                break;
-            }
-        }
-    }
-#endif
-    /* If we don't have any way of figuring out the actual executable
-       location then try argv[0].  */
-    if (!p && argv0) {
-        p = realpath(argv0, buf);
-    }
-    if (p) {
-        exec_dir = g_path_get_dirname(p);
-    } else {
-        exec_dir = CONFIG_BINDIR;
-    }
-}
-
-const char *qemu_get_exec_dir(void)
-{
-    return exec_dir;
-}
-
 #ifdef CONFIG_LINUX
 static void sigbus_handler(int signal, siginfo_t *siginfo, void *ctx)
 #else /* CONFIG_LINUX */

util/oslib-win32.c

@@ -269,42 +269,6 @@ void qemu_set_tty_echo(int fd, bool echo)
     }
 }
 
-static const char *exec_dir;
-
-void qemu_init_exec_dir(const char *argv0)
-{
-
-    char *p;
-    char buf[MAX_PATH];
-    DWORD len;
-
-    if (exec_dir) {
-        return;
-    }
-
-    len = GetModuleFileName(NULL, buf, sizeof(buf) - 1);
-    if (len == 0) {
-        return;
-    }
-
-    buf[len] = 0;
-    p = buf + len - 1;
-    while (p != buf && *p != '\\') {
-        p--;
-    }
-    *p = 0;
-    if (access(buf, R_OK) == 0) {
-        exec_dir = g_strdup(buf);
-    } else {
-        exec_dir = CONFIG_BINDIR;
-    }
-}
-
-const char *qemu_get_exec_dir(void)
-{
-    return exec_dir;
-}
-
 int getpagesize(void)
 {
     SYSTEM_INFO system_info;