seccomp_export_bpf(3) — Linux manual page


seccomp_export_bpf(3)     libseccomp Documentation     seccomp_export_bpf(3)

NAME         top

       seccomp_export_bpf, seccomp_export_pfc - Export the seccomp filter

SYNOPSIS         top

       #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         top

       The seccomp_export_bpf() and seccomp_export_pfc() functions generate
       and output the current seccomp filter in either BPF (Berkeley 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

       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         top

       Return zero on success or one of the following error codes on

              There was a system failure beyond the control of the library.

              Internal libseccomp failure.

              Invalid input, either the context or architecture token is

              The library was unable to allocate enough memory.

       If the SCMP_FLTATR_API_SYSRAWRC filter attribute is non-zero then
       additional error codes may be returned to the caller; these
       additional error codes are the negative errno values returned by the
       system.  Unfortunately libseccomp can make no guarantees about these
       return values.

EXAMPLES         top

       #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) {
                 goto out;

            /* ... */

            return -rc;

NOTES         top

       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  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         top

       Paul Moore <>

SEE ALSO         top

       seccomp_init(3), seccomp_release(3)

COLOPHON         top

       This page is part of the libseccomp (high-level API to the Linux
       Kernel's seccomp filter) project.  Information about the project can
       be found at ⟨⟩.  If you have a
       bug report for this manual page, see
       ⟨⟩.  This page was ob‐
       tained from the project's upstream Git repository
       ⟨⟩ on 2020-11-01.  (At that
       time, the date of the most recent commit that was found in the repos‐
       itory was 2020-10-25.)  If you discover any rendering problems in
       this HTML version of the page, or you believe there is a better or
       more up-to-date source for the page, or you have corrections or im‐
       provements to the information in this COLOPHON (which is not part of
       the original manual page), send a mail to              30 May 2020           seccomp_export_bpf(3)

Pages that refer to this page: seccomp(2)