NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | EXAMPLES | NOTES | AUTHOR | SEE ALSO | COLOPHON

seccomp_syscall_resolve_name(3)ccomp Documentationmp_syscall_resolve_name(3)

NAME         top

       seccomp_syscall_resolve_name - Resolve a syscall name

SYNOPSIS         top

       #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         top

       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         top

       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         top

       #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         top

       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         top

       Paul Moore <paul@paul-moore.com>

SEE ALSO         top

       seccomp_rule_add(3), seccomp_rule_add_exact(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 ⟨https://github.com/seccomp/libseccomp⟩.  If you have a
       bug report for this manual page, see 
       ⟨https://groups.google.com/d/forum/libseccomp⟩.  This page was
       obtained from the project's upstream Git repository 
       ⟨https://github.com/seccomp/libseccomp⟩ on 2017-07-05.  If you dis‐
       cover 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 improvements to the information in this
       COLOPHON (which is not part of the original manual page), send a mail
       to man-pages@man7.org

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

Pages that refer to this page: seccomp_rule_add(3)