tpostnote.c - plan9port - [fork] Plan 9 from user space
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       ---
       tpostnote.c (514B)
       ---
            1 #include <u.h>
            2 #define NOPLAN9DEFINES
            3 #include <libc.h>
            4 
            5 #include <signal.h>
            6 
            7 
            8 extern int _p9strsig(char*);
            9 
           10 int
           11 postnote(int who, int pid, char *msg)
           12 {
           13         int sig;
           14 
           15         sig = _p9strsig(msg);
           16         if(sig == 0){
           17                 werrstr("unknown note");
           18                 return -1;
           19         }
           20 
           21         if(pid <= 0){
           22                 werrstr("bad pid in postnote");
           23                 return -1;
           24         }
           25 
           26         switch(who){
           27         default:
           28                 werrstr("bad who in postnote");
           29                 return -1;
           30         case PNPROC:
           31                 return kill(pid, sig);
           32         case PNGROUP:
           33                 if((pid = getpgid(pid)) < 0)
           34                         return -1;
           35                 return killpg(pid, sig);
           36         }
           37 }