1 files changed, 29 insertions, 0 deletions
diff --git a/src/execline/getpid.c b/src/execline/getpid.c
new file mode 100644
index 0000000..03a517c
--- /dev/null
+++ b/src/execline/getpid.c
@@ -0,0 +1,29 @@
+/* ISC license. */
+
+#include <unistd.h>
+#include <skalibs/bytestr.h>
+#include <skalibs/uint.h>
+#include <skalibs/strerr2.h>
+#include <skalibs/env.h>
+#include <skalibs/djbunix.h>
+
+#define USAGE "getpid variable prog..."
+
+int main (int argc, char const *const *argv, char const *const *envp)
+{
+  unsigned int len ;
+  PROG = "getpid" ;
+  if (argc < 3) strerr_dieusage(100, USAGE) ;
+  len = str_len(argv[1]) ;
+  if (byte_chr(argv[1], len, '=') < len)
+    strerr_dief2x(100, "invalid variable name: ", argv[1]) ;
+  {
+    char fmt[UINT_FMT + len + 2] ;
+    unsigned int i = len+1 ;
+    byte_copy(fmt, len, argv[1]) ;
+    fmt[len] = '=' ;
+    i += uint_fmt(fmt+i, getpid()) ; fmt[i++] = 0 ;
+    pathexec_r(argv+2, envp, env_len(envp), fmt, i) ;
+  }
+  strerr_dieexec(111, argv[2]) ;
+}