| .TH POSTNOTE 3 | |
| .SH NAME | |
| postnote \- send a note to a process or process group | |
| .SH SYNOPSIS | |
| .B #include <u.h> | |
| .br | |
| .B #include <libc.h> | |
| .PP | |
| .nf | |
| .B | |
| int postnote(int who, int pid, char *note) | |
| .fi | |
| .SH DESCRIPTION | |
| .I Postnote | |
| sends a note to a process or process group. | |
| If | |
| .I who | |
| is | |
| .BR PNPROC , | |
| then | |
| .I note | |
| is written to | |
| .BI /proc/ pid /note\f1. | |
| If | |
| .I who | |
| is | |
| .BI PNGROUP , | |
| the note is delivered to the | |
| process group by writing | |
| .I note | |
| to | |
| .BI /proc/ pid /notepg\f1. | |
| For | |
| .B PNGROUP | |
| only, if the calling process is in the target group, the note is | |
| .I not | |
| delivered to that process. | |
| .PP | |
| If the write is successful, zero is returned. | |
| Otherwise \-1 is returned. | |
| .SH SOURCE | |
| .B /usr/local/plan9/src/libc/9sys/postnote.c | |
| .SH "SEE ALSO" | |
| .IR notify (3), | |
| .IR intro (3), | |
| .IR proc (3) | |
| .SH DIAGNOSTICS | |
| Sets | |
| .IR errstr . |