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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | EXAMPLES | NOTES | AUTHOR | SEE ALSO | COLOPHON |
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seccomp_merge(3) libseccomp Documentation seccomp_merge(3)
seccomp_merge - Merge two seccomp filters
#include <seccomp.h>
typedef void * scmp_filter_ctx;
int seccomp_merge(scmp_filter_ctx dst, scmp_filter_ctx src);
Link with -lseccomp.
The seccomp_merge() function merges the seccomp filter in src with
the filter in dst and stores the resulting in the dst filter. If
successful, the src seccomp filter is released and all internal
memory associated with the filter is freed; there is no need to
call seccomp_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.
Returns zero on success or one of the following error codes on
failure:
-EDOM Unable to merge the filters due to architecture issues,
e.g. byte endian mismatches.
-EEXIST
The architecture already exists in the filter.
-EINVAL
One of the filters is invalid.
-ENOMEM
The library was unable to allocate enough memory.
#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/* NOTE: the 'ctx_32' filter is no longer valid at this point */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;
}
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.
Paul Moore <paul@paul-moore.com>
seccomp_init(3), seccomp_reset(3), seccomp_arch_add(3),
seccomp_arch_remove(3), seccomp_attr_get(3), seccomp_attr_set(3)
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 2025-08-11. (At that
time, the date of the most recent commit that was found in the
repository was 2025-05-09.) If you discover 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 30 May 2020 seccomp_merge(3)
Pages that refer to this page: seccomp_arch_add(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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