NAME

       seccomp_arch_add,  seccomp_arch_remove,  seccomp_arch_exist,  seccomp_arch_native - Manage
       seccomp filter architectures

SYNOPSIS

       #include <seccomp.h>

       typedef void * scmp_filter_ctx;

       #define SCMP_ARCH_NATIVE
       #define SCMP_ARCH_X86
       #define SCMP_ARCH_X86_64
       #define SCMP_ARCH_X32
       #define SCMP_ARCH_ARM
       #define SCMP_ARCH_AARCH64
       #define SCMP_ARCH_MIPS
       #define SCMP_ARCH_MIPS64
       #define SCMP_ARCH_MIPS64N32
       #define SCMP_ARCH_MIPSEL
       #define SCMP_ARCH_MIPSEL64
       #define SCMP_ARCH_MIPSEL64N32
       #define SCMP_ARCH_PPC
       #define SCMP_ARCH_PPC64
       #define SCMP_ARCH_PPC64LE
       #define SCMP_ARCH_S390
       #define SCMP_ARCH_S390X
       #define SCMP_ARCH_PARISC
       #define SCMP_ARCH_PARISC64
       #define SCMP_ARCH_RISCV64

       uint32_t seccomp_arch_resolve_name(const char *arch_name);
       uint32_t seccomp_arch_native();
       int seccomp_arch_exist(const scmp_filter_ctx ctx, uint32_t arch_token);
       int seccomp_arch_add(scmp_filter_ctx ctx, uint32_t arch_token);
       int seccomp_arch_remove(scmp_filter_ctx ctx, uint32_t arch_token);

       Link with -lseccomp.

DESCRIPTION

       The seccomp_arch_exist() function tests to see if a given architecture has been  added  to
       the  seccomp filter in ctx, where the seccomp_arch_add() and seccomp_arch_remove() add and
       remove, respectively, architectures from the seccomp filter.  In all three functions,  the
       architecture  values given in arch_token should be the SCMP_ARCH_* defined constants; with
       the SCMP_ARCH_NATIVE constant always referring to the native compiled  architecture.   The
       seccomp_arch_native()  function  returns the system's architecture such that it will match
       one of the SCMP_ARCH_* constants.  While  the  seccomp_arch_resolve_name()  function  also
       returns  a  SCMP_ARCH_*  constant, the returned token matches the name of the architecture
       passed as an argument to the function.

       When a seccomp  filter  is  initialized  with  the  call  to  seccomp_init(3)  the  native
       architecture is automatically added to the filter.

       While  it  is  possible  to remove all architectures from a filter, most of the libseccomp
       APIs will fail if the filter does not contain at least one architecture.

       When adding a new architecture to an existing filter, the existing rules will not be added
       to  the  new architecture.  However, rules added after adding the new architecture will be
       added to all of the architectures in the filter.

RETURN VALUE

       The seccomp_arch_add(), seccomp_arch_remove(), and seccomp_arch_exist()  functions  return
       zero on success or one of the following error codes on failure:

       -EDOM  Architecture specific failure.

       -EEXIST
              In  the  case of seccomp_arch_add() the architecture already exists and in the case
              of seccomp_arch_remove() the architecture does not exist.

       -EINVAL
              Invalid input, either the context or architecture token is invalid.

       -ENOMEM
              The library was unable to allocate enough memory.

EXAMPLES

       #include <seccomp.h>

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

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

            if (seccomp_arch_exist(ctx, SCMP_ARCH_X86) == -EEXIST) {
                 rc = seccomp_arch_add(ctx, SCMP_ARCH_X86);
                 if (rc != 0)
                      goto out_all;
                 rc = seccomp_arch_remove(ctx, SCMP_ARCH_NATIVE);
                 if (rc != 0)
                      goto out_all;
            }

            /* ... */

       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_reset(3), seccomp_merge(3)