Provided by: libseccomp-dev_2.4.1-0ubuntu0.19.10.3_amd64 bug

NAME

       seccomp_export_bpf, seccomp_export_pfc - Export the seccomp filter

SYNOPSIS

       #include <seccomp.h>

       typedef void * scmp_filter_ctx;

       int seccomp_export_bpf(const scmp_filter_ctx ctx, int fd);
       int seccomp_export_pfc(const scmp_filter_ctx ctx, int fd);

       Link with -lseccomp.

DESCRIPTION

       The  seccomp_export_bpf()  and  seccomp_export_pfc()  functions  generate  and  output the
       current seccomp filter in either BPF (Berkley Packet Filter) or PFC (Pseudo Filter  Code).
       The  output  of  seccomp_export_bpf()  is  suitable for loading into the kernel, while the
       output of seccomp_export_pfc() is human readable and is intended primarily as a  debugging
       tool  for  developers  using  libseccomp.   Both functions write the filter to the fd file
       descriptor.

       The filter context ctx is the value returned by the call to seccomp_init(3).

       While the two output formats are guaranteed to be functionally equivalent  for  the  given
       seccomp  filter  configuration,  the  filter  instructions,  and  their  ordering, are not
       guaranteed to be the same in both the BPF and PFC formats.

RETURN VALUE

       Returns zero on success, negative errno values on failure.

EXAMPLES

       #include <seccomp.h>

       int main(int argc, char *argv[])
       {
            int rc = -1;
            scmp_filter_ctx ctx;
            int filter_fd;

            ctx = seccomp_init(SCMP_ACT_KILL);
            if (ctx == NULL)
                 goto out;

            /* ... */

            filter_fd = open("/tmp/seccomp_filter.bpf", O_WRONLY);
            if (filter_fd == -1) {
                 rc = -errno;
                 goto out;
            }

            rc = seccomp_export_bpf(ctx, filter_fd);
            if (rc < 0) {
                 close(filter_fd);
                 goto out;
            }
            close(filter_fd);

            /* ... */

       out:
            seccomp_release(ctx);
            return -rc;
       }

NOTES

       While the seccomp filter can be generated independent of the  kernel,  kernel  support  is
       required to load and enforce the seccomp filter generated by libseccomp.

       The  libseccomp project site, with more information and the source code repository, can be
       found at https://github.com/seccomp/libseccomp.  This tool,  as  well  as  the  libseccomp
       library,  is  currently  under  development, please report any bugs at the project site or
       directly to the author.

AUTHOR

       Paul Moore <paul@paul-moore.com>

SEE ALSO

       seccomp_init(3), seccomp_release(3)