seccomp_merge(3) [centos man page]

seccomp_merge(3)					     libseccomp Documentation						  seccomp_merge(3)

NAME

       seccomp_merge - Merge two seccomp filters

SYNOPSIS

       #include <seccomp.h>

       typedef void * scmp_filter_ctx;

       int seccomp_merge(scmp_filter_ctx dst, scmp_filter_ctx src);

       Link with -lseccomp.

DESCRIPTION

       The  seccomp_merge()  function merges the seccomp filter in src with the filter in dst and stores the resulting in the dst filter.  If suc-
       cessfull, the src seccomp filter is released and all internal memory assocated with the filter is freed; there is  no  need  to	call  sec-
       comp_release(3) on src and the caller should discard any references to the filter.

       In order to merge two seccomp filters, both filters must have the same attribute values and no overlapping architectures.

RETURN VALUE

       Returns zero on success and negative values on failure.

EXAMPLES

       #include <seccomp.h>

       int main(int argc, char *argv[])
       {
	    int rc = -1;
	    scmp_filter_ctx ctx_32, ctx_64;

	    ctx_32 = seccomp_init(SCMP_ACT_KILL);
	    if (ctx_32 == NULL)
		 goto out_all;
	    ctx_64 = seccomp_init(SCMP_ACT_KILL);
	    if (ctx_64 == NULL)
		 goto out_all;

	    if (seccomp_arch_exist(ctx_32, SCMP_ARCH_X86) == -EEXIST) {
		 rc = seccomp_arch_add(ctx_32, SCMP_ARCH_X86);
		 if (rc != 0)
		      goto out_all;
		 rc = seccomp_arch_remove(ctx_32, SCMP_ARCH_NATIVE);
		 if (rc != 0)
		      goto out_all;
	    }
	    if (seccomp_arch_exist(ctx_64, SCMP_ARCH_X86_64) == -EEXIST) {
		 rc = seccomp_arch_add(ctx_64, SCMP_ARCH_X86_64);
		 if (rc != 0)
		      goto out_all;
		 rc = seccomp_arch_remove(ctx_64, SCMP_ARCH_NATIVE);
		 if (rc != 0)
		      goto out_all;
	    }

	    /* ... */

	    rc = seccomp_merge(ctx_64, ctx_32);
	    if (rc != 0)
		 goto out_all;

	    /* NOTE: the 'ctx_32' filter is no longer valid at this point */

	    /* ... */

       out:
	    seccomp_release(ctx_64);
	    return -rc;
       out_all:
	    seccomp_release(ctx_32);
	    goto out;
       }

NOTES

       While the seccomp filter can be generated independent of the kernel, kernel support is required to load and enforce the seccomp filter gen-
       erated by libseccomp.

       The libseccomp project site, with more information and the source code repository, can be found at http://libseccomp.sf.net.  This  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_arch_add(3), seccomp_arch_remove(3), seccomp_attr_get(3), seccomp_attr_set(3)

paul@paul-moore.com						 28 September 2012						  seccomp_merge(3)

Check Out this Related Man Page

seccomp_export_bpf(3)					     libseccomp Documentation					     seccomp_export_bpf(3)

NAME

       seccomp_export_bpf, seccomp_export_pfc - Export the seccomp filter

SYNOPSIS

       #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

       The  seccomp_export_bpf()  and  seccomp_export_pfc() functions generate and output the current seccomp filter in either BPF (Berkley Packet
       Filter) or PFC (Pseudo Filter Code).  The output of seccomp_export_bpf() is suitable for loading into the kernel, while the output of  sec-
       comp_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 seccomp_init(3).

       While the two output formats are guaranteed to be functionally equivalent for the given seccomp filter configuration, the  filter  instruc-
       tions, and their ordering, are not guaranteed to be the same in both the BPF and PFC formats.

RETURN VALUE

       Returns zero on success, negative errno values on failure.

EXAMPLES

       #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) {
		 close(filter_fd);
		 goto out;
	    }
	    close(filter_fd);

	    /* ... */

       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 gen-
       erated by libseccomp.

       The libseccomp project site, with more information and the source code repository, can be found at http://libseccomp.sf.net.  This  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_release(3)

paul@paul-moore.com						   25 July 2012 					     seccomp_export_bpf(3)

Linux and UNIX Man Pages

seccomp_merge(3) [centos man page]

Check Out this Related Man Page