prog.c:9:16: error: unknown type name ‘pid_t’
void fork4aCmd(pid_t*, char*);
^~~~~
prog.c:10:17: error: unknown type name ‘pid_t’
void wait4Child(pid_t*);
^~~~~
prog.c: In function ‘main’:
prog.c:15:2: error: unknown type name ‘pid_t’
pid_t pid;
^~~~~
prog.c:20:3: warning: implicit declaration of function ‘fork4aCmd’ [-Wimplicit-function-declaration]
fork4aCmd(buf);
^~~~~~~~~
prog.c:21:3: warning: implicit declaration of function ‘wait4child’ [-Wimplicit-function-declaration]
wait4child(pid);
^~~~~~~~~~
prog.c: At top level:
prog.c:33:16: error: unknown type name ‘pid_t’
void fork4aCmd(pid_t *pid, char *buf)
^~~~~
prog.c:46:17: error: unknown type name ‘pid_t’
void wait4Child(pid_t *pid)
^~~~~