path: root/include/nftables.h
diff options
authorPhil Sutter <>2017-09-28 17:17:45 +0200
committerPablo Neira Ayuso <>2017-09-29 12:37:51 +0200
commit2535ba7006f22a6470f4c88ea7d30c343a1d8799 (patch)
treee09697d8d9a59394170fa412276346d64b5b62e7 /include/nftables.h
parent15a1f5bd55735f6f65a6fd9e2e86bb4a3f5ac815 (diff)
src: get rid of printf
This patch introduces nft_print()/nft_gmp_print() functions which have to be used instead of printf to output information that were previously send to stdout. These functions print to a FILE pointer defined in struct output_ctx. It is set by calling: | old_fp = nft_ctx_set_output(ctx, new_fp); Having an application-defined FILE pointer is actually quite flexible: Using fmemopen() or even fopencookie(), an application gains full control over what is printed and where it should go to. Signed-off-by: Eric Leblond <> Signed-off-by: Phil Sutter <> Signed-off-by: Pablo Neira Ayuso <>
Diffstat (limited to 'include/nftables.h')
1 files changed, 6 insertions, 0 deletions
diff --git a/include/nftables.h b/include/nftables.h
index 3429e4c1..01d72a87 100644
--- a/include/nftables.h
+++ b/include/nftables.h
@@ -30,6 +30,7 @@ struct output_ctx {
unsigned int ip2name;
unsigned int handle;
unsigned int echo;
+ FILE *output_fp;
struct nft_cache {
@@ -148,4 +149,9 @@ void realm_table_meta_exit(void);
void devgroup_table_exit(void);
void realm_table_rt_exit(void);
+int nft_print(struct output_ctx *octx, const char *fmt, ...)
+ __attribute__((format(printf, 2, 3)));
+int nft_gmp_print(struct output_ctx *octx, const char *fmt, ...)
+ __attribute__((format(printf, 2, 0)));