Complete revamp of the pathexec functions

- pathexec_run is now called exec_ae
    a for provided file name (default: argv[0])
    e for provided envp (default: environ)
- pathexec is now called mexec. m for merge environment. Option letters are:
    a for provided file name (default: argv[0])
    e for provided envp (default: environ)
    f for provided envp *and* length of the envp
    m for provided modif string plus its length (the length is always needed
because the modifs are null-terminated)
    n for provided modif string, length *and* number of modifs
- functions have a foo0 version for _exit(0) when argv[0] is null
- functions have a xfoo version to die if the exec fails
- and a xfoo0
- Compatibility #defines and #includes are there until the next major bump

1 files changed, 12 insertions, 0 deletions

diff --git a/src/libenvexec/xmexec0_afn.c b/src/libenvexec/xmexec0_afn.c
new file mode 100644
index 0000000..73eeb04
--- /dev/null
+++ b/src/libenvexec/xmexec0_afn.c
@@ -0,0 +1,12 @@
+/* ISC license. */
+
+#include <errno.h>
+
+#include <skalibs/exec.h>
+#include <skalibs/strerr2.h>
+
+void xmexec0_afn (char const *file, char const *const *argv, char const *const *envp, size_t envlen, char const *modif, size_t modiflen, size_t modifn)
+{
+  mexec0_afn(file, argv, envp, envlen, modif, modiflen, modifn) ;
+  strerr_dieexec(errno == ENOENT ? 127 : 126, file) ;
+}