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)

paul@paul-moore.com                                8 May 2014                    seccomp_syscall_resolve_name(3)