glibc/include/sys, branch master

Update copyright dates with scripts/update-copyrights

2024-01-01T18:53:40Z

malloc: Use __get_nprocs on arena_get2 (BZ 30945)

2023-11-22T12:39:29Z

This restore the 2.33 semantic for arena_get2. It was changed by 11a02b035b46 to avoid arena_get2 call malloc (back when __get_nproc was refactored to use an scratch_buffer - 903bc7dcc2acafc). The __get_nproc was refactored over then and now it also avoid to call malloc. The 11a02b035b46 did not take in consideration any performance implication, which should have been discussed properly. The __get_nprocs_sched is still used as a fallback mechanism if procfs and sysfs is not acessible. Checked on x86_64-linux-gnu. Reviewed-by: DJ Delorie

linux: Add PR_SET_VMA_ANON_NAME support

2023-11-07T13:27:20Z

Linux 5.17 added support to naming anonymous virtual memory areas through the prctl syscall. The __set_vma_name is a wrapper to avoid optimizing the prctl call if the kernel does not support it. If the kernel does not support PR_SET_VMA_ANON_NAME, prctl returns EINVAL. And it also returns the same error for an invalid argument. Since it is an internal-only API, it assumes well-formatted input: aligned START, with (START, START+LEN) being a valid memory range, and NAME with a limit of 80 characters without an invalid one ("\\`$[]"). Reviewed-by: DJ Delorie

misc/bits/syslog.h: Clearly separate declaration from definition

2023-07-05T14:59:48Z

This allows to include bits/syslog-decl.h in include/sys/syslog.h and therefore be able to create the libc_hidden_builtin_proto (__syslog_chk) prototype. Reviewed-by: Siddhesh Poyarekar

misc/bits/select2.h: Clearly separate declaration from definitions

2023-07-05T14:59:48Z

The __fdelt_chk declaration needs to be available so that libc_hidden_proto can be used while not redefining __FD_ELT. Thus, misc/bits/select-decl.h is created to hold the corresponding prototypes. Reviewed-by: Siddhesh Poyarekar

misc/sys/cdefs.h: Create FORTIFY redirects for internal calls

2023-07-05T14:59:48Z

The __REDIRECT* macros are creating aliases which may lead to unwanted PLT entries when fortification is enabled. To prevent these entries, the REDIRECT alias should be set to point to the existing __GI_* aliases. This is done transparently by creating a __REDIRECT_FORTIFY* version of these macros, that can be overwritten internally when necessary. Reviewed-by: Siddhesh Poyarekar

Fix all the remaining misspellings -- BZ 25337

2023-06-02T01:39:48Z

Use __nonnull for the epoll_wait(2) family of syscalls

2023-06-01T17:50:42Z

Signed-off-by: Alejandro Colomar Reviewed-by: Adhemerval Zanella

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2023-01-06T21:14:39Z

Linux: Add ppoll fortify symbol for 64 bit time_t (BZ# 29746)

2022-11-08T16:37:06Z

Similar to ppoll, the poll.h header needs to redirect the poll call to a proper fortified ppoll with 64 bit time_t support. The implementation is straightforward, just need to add a similar check as __poll_chk and call the 64 bit time_t ppoll version. The debug fortify tests are also extended to cover 64 bit time_t for affected ABIs. Unfortunately it requires an aditional symbol, which makes backport tricky. One possibility is to add a static inline version if compiler supports is and call abort instead of __chk_fail, so fortified version will call __poll64 in the end. Another possibility is to just remove the fortify support for _TIME_BITS=64. Checked on i686-linux-gnu.