start of an external exe to deal with permissions issues

src/sigar_main.c

@@ -0,0 +1,122 @@
+#include <dlfcn.h>
+#include <stdio.h>
+#include <strings.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include "sigar.h"
+#include "sigar_fileinfo.h"
+
+typedef struct {
+    const char *name;
+    void *func;
+} sigar_callback_t;
+
+struct {
+    struct {
+        const char *name;
+        sigar_version_t * (*func)(void);
+    } version;
+
+    struct {
+        const char *name;
+        int (*func)(sigar_t *, pid_t, sigar_proc_exe_t *);
+    } proc_exe;
+    struct {
+        const char *name;
+        int (*func)(sigar_t *, pid_t, sigar_proc_args_t *);
+    } proc_args;
+    struct {
+        const char *name;
+        int (*func)(sigar_t *, pid_t, sigar_proc_env_t *);
+    } proc_env;
+    struct {
+        const char *name;
+        int (*func)(sigar_t *, pid_t, sigar_proc_modules_t *);
+    } proc_modules;
+    struct {
+        const char *name;
+        int (*func)(sigar_t *, pid_t, sigar_proc_fd_t *);
+    } proc_fd;
+    struct {
+        const char *name;
+        int (*func)(sigar_t *, int, unsigned long, sigar_pid_t *);
+    } proc_port;
+
+    struct {
+        const char *name;
+        int (*func)(sigar_t *, const char *dir, sigar_dir_stat_t *);
+    } dir_stat;
+    struct {
+        const char *name;
+        int (*func)(sigar_t *, const char *dir, sigar_dir_usage_t *);
+    } dir_usage;
+    sigar_callback_t end;
+} sigar_callbacks = {
+    { "sigar_version_get", NULL },
+    { "sigar_proc_exe_get", NULL },
+    { "sigar_proc_args_get", NULL },
+    { "sigar_proc_env_get", NULL },
+    { "sigar_proc_modules_get", NULL },
+    { "sigar_proc_fd_get", NULL },
+    { "sigar_proc_port_get", NULL },
+    { "sigar_dir_stat_get", NULL },
+    { "sigar_dir_usage_get", NULL },
+    { NULL, NULL }
+}; 
+
+static int sigar_main(char *argv0)
+{
+    char *ptr;
+    char sigarlib[8096], archlib[512];
+    void *handle;
+    sigar_callback_t *callbacks =
+        (sigar_callback_t *)&sigar_callbacks;
+    int i;
+
+    strcpy(sigarlib, argv0);
+    ptr = rindex(sigarlib, '/');
+    if (ptr) {
+        ++ptr;
+        sprintf(archlib, "lib%s.so", ptr);
+        strcpy(ptr, archlib);
+    }
+
+#if defined(__sun)
+    dlopen("/usr/lib/libnsl.so", RTLD_NOW|RTLD_GLOBAL);
+#endif
+
+    if (!(handle = dlopen(sigarlib, RTLD_LAZY))) {
+        fprintf(stderr, "Error opening '%s': %s\n",
+                sigarlib, dlerror());
+        exit(1);
+    }
+
+    while (callbacks->name) {
+        callbacks->func = dlsym(handle, callbacks->name);
+        callbacks++;
+    }
+
+    if (isatty(fileno(stdin))) {
+        sigar_version_t *version =
+            sigar_callbacks.version.func();
+
+        printf("version=%s, build date=%s\n",
+               version->version, version->build_date);
+        dlclose(handle);
+        exit(0);
+    }
+
+    dlclose(handle);
+
+    return 0;
+}
+
+int main(int argc, char **argv)
+{
+    if (argc == 1) {
+        return sigar_main(argv[0]);
+    }
+    else {
+        return 1; /*XXX*/
+    }
+}