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Top Forums Programming Very simple Unix Prog in C, could use advice/help Post 17238 by Perderabo on Tuesday 12th of March 2002 01:40:17 PM
Old 03-12-2002
Originally posted by AtleRamsli

I have a 'standard' way for dealing with opening/creation.

Try to open, if that fails, _try_to_ create.
If create was successful, close.
Now, we have done what we can to make sure
we can open the file, so now try to open
and return the result.
if (fd = open(...) == -1) {
if (fd = creat(...) != -1)
fd = open(...);

What is the point of all of that? Why not just use open() with an O_CREAT flag and a mode argument?

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SRV(3)							     Library Functions Manual							    SRV(3)

srv - server registry SYNOPSIS
bind #s /srv #s/service1 #s/service2 ... DESCRIPTION
The srv device provides a one-level directory holding already-open channels to services. In effect, srv is a bulletin board on which pro- cesses may post open file descriptors to make them available to other processes. To install a channel, create a new file such as /srv/myserv and then write a text string (suitable for strtoul; see atof(2)) giving the file descriptor number of an open file. Any process may then open /srv/myserv to acquire another reference to the open file that was reg- istered. An entry in srv holds a reference to the associated file even if no process has the file open. Removing the file from /srv releases that reference. It is an error to write more than one number into a server file, or to create a file with a name that is already being used. EXAMPLE
To drop one end of a pipe into /srv, that is, to create a named pipe: int fd, p[2]; char buf[32]; pipe(p); fd = create("/srv/namedpipe", 1, 0666); sprint(buf, "%d", p[0]); write(fd, buf, strlen(buf)); close(fd); close(p[0]); write(p[1], "hello", 5); At this point, any process may open and read /srv/namedpipe to receive the hello string. Data written to /srv/namedpipe will be received by executing read(p[1], buf, sizeof buf); in the above process. SOURCE
/sys/src/9/port/devsrv.c SRV(3)

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