Re: [PATCH 2/4] conf, passt: Rename stderr to force_stderr

On Wed, Mar 08, 2023 at 08:35:14AM +0100, Stefano Brivio wrote:

From: Chris Kuhn

While building against musl, gcc informs us that 'stderr' is a protected keyword. This probably comes from a #define stderr (stderr) in musl's stdio.h, to avoid a clash with extern FILE *const stderr, but I didn't really track it down. Just rename it to force_stderr, it makes more sense.

[sbrivio: Added commit message] Signed-off-by: Stefano Brivio

Reviewed-by: David Gibson Shadowing a libc global is not a great idea. Since it's a field, not a variable we're not *exactly* doing that, but it's close enough that I think this is better regardless of musl constraints. (I once had a particularly wonderful time tracking down a bizarre bug because 'index' ended up resolving to index(3) instead of the local variable I expected it to).

--- conf.c | 6 +++--- passt.c | 2 +- passt.h | 4 ++-- 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/conf.c b/conf.c index 15506ec..07b0b7b 100644 --- a/conf.c +++ b/conf.c @@ -1356,13 +1356,13 @@ void conf(struct ctx *c, int argc, char **argv) if (logfile) die("Can't log to both file and stderr");

- if (c->stderr) + if (c->force_stderr) die("Multiple --stderr options given");

- c->stderr = 1; + c->force_stderr = 1; break; case 'l': - if (c->stderr) + if (c->force_stderr) die("Can't log to both stderr and file");

if (logfile) diff --git a/passt.c b/passt.c index 5b8146e..f67213a 100644 --- a/passt.c +++ b/passt.c @@ -241,7 +241,7 @@ int main(int argc, char **argv) conf(&c, argc, argv); trace_init(c.trace);

- if (c.stderr || isatty(fileno(stdout))) + if (c.force_stderr || isatty(fileno(stdout))) __openlog(log_name, LOG_PERROR, LOG_DAEMON);

quit_fd = pasta_netns_quit_init(&c); diff --git a/passt.h b/passt.h index b73f4ff..006d1c1 100644 --- a/passt.h +++ b/passt.h @@ -158,7 +158,7 @@ struct ip6_ctx { * @trace: Enable tracing (extra debug) mode * @quiet: Don't print informational messages * @foreground: Run in foreground, don't log to stderr by default - * @stderr: Force logging to stderr + * @force_stderr: Force logging to stderr * @nofile: Maximum number of open files (ulimit -n) * @sock_path: Path for UNIX domain socket * @pcap: Path for packet capture file @@ -207,7 +207,7 @@ struct ctx { int trace; int quiet; int foreground; - int stderr; + int force_stderr; int nofile; char sock_path[UNIX_PATH_MAX]; char pcap[PATH_MAX];

-- David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_ | _way_ _around_! http://www.ozlabs.org/~dgibson