github.com/roboticscm/goman@v0.0.0-20210203095141-87c07b4a0a55/src/lib9/run_unix.c (about)

     1  // Copyright 2013 The Go Authors.  All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // +build darwin dragonfly freebsd linux netbsd openbsd solaris
     6  
     7  #include <u.h>
     8  #include <errno.h>
     9  #include <sys/wait.h>
    10  #define NOPLAN9DEFINES
    11  #include <libc.h>
    12  
    13  int
    14  runcmd(char **argv)
    15  {
    16  	int pid, pid1, status;
    17  	
    18  	switch(pid = fork()) {
    19  	case -1:
    20  		return -1;
    21  	case 0:
    22  		execvp(argv[0], argv);
    23  		fprint(2, "exec %s: %r\n", argv[0]);
    24  		_exit(1);
    25  	}
    26  	
    27  	while((pid1 = wait(&status)) < 0) {
    28  		if(errno != EINTR) {
    29  			werrstr("waitpid: %r");
    30  			return -1;
    31  		}
    32  	}
    33  	if(pid1 != pid) {
    34  		werrstr("unexpected pid in wait");
    35  		return -1;
    36  	}
    37  	if(!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
    38  		werrstr("unsuccessful exit status %#x", status);
    39  		return -1;
    40  	}
    41  	return 0;
    42  }
    43