NAME

       seccomp_syscall_resolve_name - Resolve a syscall name

SYNOPSIS

       #include <seccomp.h>

       int seccomp_syscall_resolve_name(const char *name);
       int seccomp_syscall_resolve_name_arch(uint32_t arch_token,
                                             const char *name);
       int seccomp_syscall_resolve_name_rewrite(uint32_t arch_token,
                                                const char *name);
       char *seccomp_syscall_resolve_num_arch(uint32_t arch_token, int num);

       Link with -lseccomp.

DESCRIPTION

       The      seccomp_syscall_resolve_name(),      seccomp_syscall_resolve_name_arch(),     and
       seccomp_syscall_resolve_name_rewrite() functions resolve the commonly used syscall name to
       the  syscall  number  used  by  the  kernel  and  the  rest  of  the  libseccomp API, with
       seccomp_syscall_resolve_name_rewrite() rewriting the syscall number for architectures that
       modify the syscall.  Syscall rewriting typically happens in case of a multiplexed syscall,
       like socketcall(2) or ipc(2) on x86.  seccomp_syscall_resolve_num_arch() function resolves
       the syscall number used by the kernel to the commonly used syscall name.

       The     caller    is    responsible    for    freeing    the    returned    string    from
       seccomp_syscall_resolve_num_arch().

RETURN VALUE

       In the case of  seccomp_syscall_resolve_name(),  seccomp_syscall_resolve_name_arch(),  and
       seccomp_syscall_resolve_name_rewrite() the associated syscall number is returned, with the
       negative pseudo syscall number being returned in cases where the given  syscall  does  not
       exist  for  the architecture.  The value __NR_SCMP_ERROR is returned in case of error.  In
       all cases, the return value is suitable for use  in  any  libseccomp  API  function  which
       requires     the    syscall    number,    examples    include    seccomp_rule_add()    and
       seccomp_rule_add_exact().

       In the case of seccomp_syscall_resolve_num_arch() the associated syscall name is  returned
       and it remains the callers responsibility to free the returned string via free(3).

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;

            /* ... */

            rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW,
                                  seccomp_syscall_resolve_name("open"), 0);
            if (rc < 0)
                 goto out;

            /* ... */

            rc = seccomp_load(ctx);
            if (rc < 0)
                 goto out;

            /* ... */

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

NOTES

       In   case   of   bare   syscalls   implemented   on   top   of   a   multiplexed  syscall,
       seccomp_syscall_resolve_name() and  seccomp_syscall_resolve_name_arch()  can  be  used  to
       verify   if   a   bare   syscall   is  implemented  for  a  specific  architecture,  while
       seccomp_syscall_resolve_name_rewrite() can be used to determine the underlying multiplexed
       syscall.

       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_rule_add(3), seccomp_rule_add_exact(3)