root/src/lib9/run_unix.c

DEFINITIONS

1. runcmd

// Copyright 2013 The Go Authors.  All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// +build darwin dragonfly freebsd linux netbsd openbsd solaris

#include <u.h>
#include <errno.h>
#include <sys/wait.h>
#define NOPLAN9DEFINES
#include <libc.h>

int
runcmd(char **argv)
{
        int pid, pid1, status;
        
        switch(pid = fork()) {
        case -1:
                return -1;
        case 0:
                execvp(argv[0], argv);
                fprint(2, "exec %s: %r\n", argv[0]);
                _exit(1);
        }
        
        while((pid1 = wait(&status)) < 0) {
                if(errno != EINTR) {
                        werrstr("waitpid: %r");
                        return -1;
                }
        }
        if(pid1 != pid) {
                werrstr("unexpected pid in wait");
                return -1;
        }
        if(!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
                werrstr("unsuccessful exit status %#x", status);
                return -1;
        }
        return 0;
}