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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | EXAMPLES | NOTES | AUTHOR | SEE ALSO | COLOPHON |
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seccomp_precompute(3) libseccomp Documentation seccomp_precompute(3)
seccomp_precompute - Precompute the current seccomp filter
#include <seccomp.h>
typedef void * scmp_filter_ctx;
int seccomp_precompute(scmp_filter_ctx ctx);
Link with -lseccomp.
Precomputes the seccomp filter for later use by seccomp_load()
and similar functions. Not only does this improve performance of
seccomp_load() it also ensures that the seccomp filter can be
loaded in an async-signal-safe manner if no changes have been
made to the filter since it was precomputed.
Returns zero on success or one of the following error codes on
failure:
-ECANCELED
There was a system failure beyond the control of the
library.
-EFAULT
Internal libseccomp failure.
-EINVAL
Invalid input, either the context or architecture token is
invalid.
-ENOMEM
The library was unable to allocate enough memory.
If the SCMP_FLTATR_API_SYSRAWRC filter attribute is non-zero then
additional error codes may be returned to the caller; these
additional error codes are the negative errno values returned by
the system. Unfortunately libseccomp can make no guarantees
about these return values.
#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_precompute(ctx);
if (rc < 0)
goto out;
/* ... */
rc = seccomp_load(ctx);
if (rc < 0)
goto out;
/* ... */
out:
seccomp_release(ctx);
return -rc;
}
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_load(3) signal-safety(7)
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 2023-12-22. (At that
time, the date of the most recent commit that was found in the
repository was 2023-12-01.) 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 19 September 2022 seccomp_precompute(3)
Pages that refer to this page: seccomp_load(3)
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HTML rendering created 2023-12-22 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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