execvp - execute a program found on the search path
Standard C Library (libc, -lc)
execvp(const char *program, char **args);
execvp searches for program on the program search path and execs it with execv if found. If program is not found or a serious error occurs, it returns.
If program contains a slash, no search is done; the specified string is passed directly to execv.
The args argument should be prepared exactly as for execv.
The search path is a colon-delimited list of directories retrieved by calling getenv to retrieve the PATH environment variable. Unless you implement execve and environment variable passing, the value used is from a default environment compiled into libc. This path searches the /bin, /sbin, and /testbin directories.
On success, execvp does not return; instead, the new program begins executing. On failure, execvp returns -1, and sets errno to a suitable error code for the error condition encountered.
execvp can fail for any of the reasons execv can. In addition, it produces ENOENT if the requested program is not found.