NGX_INVALID_PID   573 src/core/nginx.c         return NGX_INVALID_PID;
NGX_INVALID_PID   581 src/core/nginx.c         return NGX_INVALID_PID;
NGX_INVALID_PID   631 src/core/nginx.c         return NGX_INVALID_PID;
NGX_INVALID_PID   636 src/core/nginx.c     if (pid == NGX_INVALID_PID) {
NGX_INVALID_PID   108 src/os/unix/ngx_process.c             return NGX_INVALID_PID;
NGX_INVALID_PID   121 src/os/unix/ngx_process.c             return NGX_INVALID_PID;
NGX_INVALID_PID   134 src/os/unix/ngx_process.c             return NGX_INVALID_PID;
NGX_INVALID_PID   142 src/os/unix/ngx_process.c             return NGX_INVALID_PID;
NGX_INVALID_PID   150 src/os/unix/ngx_process.c             return NGX_INVALID_PID;
NGX_INVALID_PID   157 src/os/unix/ngx_process.c             return NGX_INVALID_PID;
NGX_INVALID_PID   165 src/os/unix/ngx_process.c             return NGX_INVALID_PID;
NGX_INVALID_PID   173 src/os/unix/ngx_process.c             return NGX_INVALID_PID;
NGX_INVALID_PID   194 src/os/unix/ngx_process.c         return NGX_INVALID_PID;
NGX_INVALID_PID   624 src/os/unix/ngx_process_cycle.c                     == NGX_INVALID_PID)