Add sagetexecname() and all the necessary infrastructure

Signed-off-by: Laurent Bercot <ska@appnovation.com>

1 files changed, 111 insertions, 0 deletions

diff --git a/src/libstddjb/sagetexecname.c b/src/libstddjb/sagetexecname.c
new file mode 100644
index 0000000..d3c300b
--- /dev/null
+++ b/src/libstddjb/sagetexecname.c
@@ -0,0 +1,111 @@
+/* ISC license. */
+
+#include <skalibs/sysdeps.h>
+
+#if defined(SKALIBS_PROCSELFEXE)
+
+#include <skalibs/stralloc.h>
+#include <skalibs/djbunix.h>
+
+int sagetexecname (stralloc *sa)
+{
+  return sareadlink(sa, SKALIBS_PROCSELFEXE) ;
+}
+
+#elif defined(SKALIBS_HASGETEXECNAME)
+
+#include <skalibs/nonposix.h>
+#include <stdlib.h>
+
+#include <skalibs/stralloc.h>
+#include <skalibs/djbunix.h>
+
+int sagetexecname (stralloc *sa)
+{
+  return sarealpath(sa, getexecname()) ;
+}
+
+#elif defined(SKALIBS_HASKERNPROCPATHNAME)
+
+#include <skalibs/nonposix.h>
+#ifdef __NetBSD__
+#include <sys/param.h>
+#endif
+#include <limits.h>
+#include <sys/sysctl.h>
+
+#include <skalibs/stralloc.h>
+#include <skalibs/djbunix.h>
+
+int sagetexecname (stralloc *sa)
+{
+  int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 } ;
+  char buf[PATH_MAX] ;
+  size_t len = sizeof(buf) ;
+  if (sysctl(mib, 4, buf, &len, 0, 0) == -1) return -1 ;
+  if (!stralloc_catb(sa, buf, len) || !stralloc_0(sa)) return -1 ;
+  return 0 ;
+}
+
+#elif defined(SKALIBS_HAS_NSGETEXECUTABLEPATH)
+
+#include <skalibs/nonposix.h>
+#include <sys/types.h>
+#include <stdint.h>
+#include <macho-o/dyld.h>
+
+#include <skalibs/stralloc.h>
+#include <skalibs/djbunix.h>
+
+int sagetexecname (stralloc *sa)
+{
+  char buf[4096] ;
+  uint32_t len = sizeof(buf) ;
+  if (_NSGetExecutablePath(buf, &len) == -1) return -1 ;
+  return sarealpath(sa, buf) ;
+}
+
+#elif defined(SKALIBS_HASGETAUXVAL)
+
+#include <skalibs/nonposix.h>
+#include <sys/auxv.h>
+
+#include <skalibs/stralloc.h>
+#include <skalibs/djbunix.h>
+
+int sagetexecname (stralloc *sa)
+{
+  unsigned long x = getauxval(AT_EXECFN) ;
+  return sarealpath(sa, (char const *)x) ;
+}
+
+#elif defined(SKALIBS_HASDLADDR)
+
+#include <skalibs/nonposix.h>
+#include <dlfcn.h>
+
+#include <skalibs/stralloc.h>
+#include <skalibs/djbunix.h>
+
+int sagetexecname (stralloc *sa)
+{
+  Dl_info info ;
+  if (!dladdr(&main, &info)) return -1 ;
+  if (!stralloc_cats(sa, info.dli_fname) || !stralloc_0(sa)) return -1 ;
+  return 0 ;
+}
+
+#else  /* we tried */
+
+#include <errno.h>
+
+#include <skalibs/stralloc.h>
+#include <skalibs/djbunix.h>
+
+int sagetexecname (stralloc *sa)
+{
+  errno = ENOSYS ;
+  return -1 ;
+}
+
+#endif