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04da832e16
Linux/Alpha has two versions of several system call wrappers that take or return data of type "struct timeval" (possibly nested inside a larger structure). The GLIBC_2.0 version is a compat symbol that calls __NR_osf_foo or __NR_old_foo and uses a struct timeval with a 32-bit tv_sec field. The GLIBC_2.1 version is used for current code, calls __NR_foo, and uses a struct timeval with a 64-bit tv_sec field. This patch changes all of the compat symbols of this type to be wrappers around their GLIBC_2.1 counterparts; the compatibility system calls will no longer be used. It serves as a proposal for part of how we do the transition to 64-bit time_t on systems that currently use 32-bit time_t: * The patched glibc will NOT use system calls that involve 32-bit time_t to implement its compatibility symbols. This will make both our lives and the kernel maintainers' lives easier. The primary argument I've seen against it is that the kernel could warn about uses of the old system calls, helping people find old binaries that need to be recompiled. I think there are several other ways we could accomplish this, e.g. scripts to scan the filesystem for binaries with references to the old symbol versions, or issuing diagnostics ourselves. * The compat symbols do NOT report failure after the Y2038 deadline. An earlier revision of this patch had them return -1 and set errno to EOVERFLOW, but Adhemerval pointed out that many of them have already performed side effects at the point where we discover the overflow, so that would break more than it fixes. Also, we don't want people to be _checking_ for EOVERFLOW from these functions; we want them to recompile with 64-bit time_t. So it's not actually useful for them to report failure to the calling code. * What they do do, when they encounter overflow, is saturate the overflowed "struct timeval"(s): tv_sec is set to INT32_MAX and tv_nsec is set to 999999. That means time stops advancing for programs with 32-bit time_t when they reach the deadline. That's obviously going to break stuff, but I think wrapping around is probably going to break _more_ stuff. I'd be interested to hear arguments against, if anyone has one. The new header file tv32-compat.h is currently Alpha-specific but I mean for it to be reused to aid in writing wrappers for all affected architectures. I only put it in sysdeps/unix/sysv/linux/alpha for now because I haven't checked whether the various "foo32" structures it defines agree with the ABI for ports other than Linux/Alpha. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
114 lines
4.9 KiB
Plaintext
114 lines
4.9 KiB
Plaintext
# File name Caller Syscall name Args Strong name Weak names
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alarm - alarm i:i alarm
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bdflush EXTRA bdflush i:ii __compat_bdflush bdflush@GLIBC_2.0:GLIBC_2.23
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capget EXTRA capget i:pp capget
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capset EXTRA capset i:pp capset
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clock_adjtime EXTRA clock_adjtime i:ip clock_adjtime
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create_module EXTRA create_module 3 __compat_create_module create_module@GLIBC_2.0:GLIBC_2.23
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delete_module EXTRA delete_module 3 delete_module
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epoll_create EXTRA epoll_create i:i epoll_create
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epoll_create1 EXTRA epoll_create1 i:i epoll_create1
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epoll_ctl EXTRA epoll_ctl i:iiip epoll_ctl
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eventfd EXTRA eventfd2 i:ii eventfd
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execve - execve i:spp __execve execve
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flock - flock i:ii __flock flock
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get_kernel_syms EXTRA get_kernel_syms i:p __compat_get_kernel_syms get_kernel_syms@GLIBC_2.0:GLIBC_2.23
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getpid - getpid Ei: __getpid getpid
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getegid - getegid Ei: __getegid getegid
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geteuid - geteuid Ei: __geteuid geteuid
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getpgid - getpgid i:i __getpgid getpgid
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getpgrp - getpgrp Ei: getpgrp
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getppid - getppid Ei: __getppid getppid
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getresuid - getresuid i:ppp getresuid
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getresgid - getresgid i:ppp getresgid
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getsid - getsid i:i getsid
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init_module EXTRA init_module 5 init_module
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inotify_add_watch EXTRA inotify_add_watch i:isi inotify_add_watch
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inotify_init EXTRA inotify_init i: inotify_init
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inotify_init1 EXTRA inotify_init1 i:I inotify_init1
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inotify_rm_watch EXTRA inotify_rm_watch i:ii inotify_rm_watch
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ioperm - ioperm i:iii ioperm
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iopl - iopl i:i iopl
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klogctl EXTRA syslog i:isi klogctl
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lchown - lchown i:sii __lchown lchown
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mincore - mincore i:anV mincore
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mlock - mlock i:bn mlock
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mlockall - mlockall i:i mlockall
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mount EXTRA mount i:sssip __mount mount
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mremap EXTRA mremap b:ainip __mremap mremap
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munlock - munlock i:ai munlock
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munlockall - munlockall i: munlockall
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nfsservctl EXTRA nfsservctl i:ipp __compat_nfsservctl nfsservctl@GLIBC_2.0:GLIBC_2.28
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pipe - pipe i:f __pipe pipe
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pipe2 - pipe2 i:fi __pipe2 pipe2
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pivot_root EXTRA pivot_root i:ss pivot_root
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prctl EXTRA prctl i:iiiii __prctl prctl
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query_module EXTRA query_module i:sipip __compat_query_module query_module@GLIBC_2.0:GLIBC_2.23
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quotactl EXTRA quotactl i:isip quotactl
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remap_file_pages - remap_file_pages i:piiii __remap_file_pages remap_file_pages
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sched_getp - sched_getparam i:ip __sched_getparam sched_getparam
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sched_gets - sched_getscheduler i:i __sched_getscheduler sched_getscheduler
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sched_primax - sched_get_priority_max i:i __sched_get_priority_max sched_get_priority_max
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sched_primin - sched_get_priority_min i:i __sched_get_priority_min sched_get_priority_min
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sched_rr_gi - sched_rr_get_interval i:ip __sched_rr_get_interval sched_rr_get_interval
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sched_setp - sched_setparam i:ip __sched_setparam sched_setparam
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sched_sets - sched_setscheduler i:iip __sched_setscheduler sched_setscheduler
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sched_yield - sched_yield i: __sched_yield sched_yield
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sendfile - sendfile i:iipi sendfile
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sendfile64 - sendfile64 i:iipi sendfile64
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setfsgid EXTRA setfsgid i:i setfsgid
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setfsuid EXTRA setfsuid i:i setfsuid
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setpgid - setpgid i:ii __setpgid setpgid
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sigaltstack - sigaltstack i:PP __sigaltstack sigaltstack
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stime - stime i:p stime
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sysinfo EXTRA sysinfo i:p __sysinfo sysinfo
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swapon - swapon i:si __swapon swapon
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swapoff - swapoff i:s __swapoff swapoff
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unshare EXTRA unshare i:i unshare
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uselib EXTRA uselib i:s __compat_uselib uselib@GLIBC_2.0:GLIBC_2.23
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utime - utime i:sP utime
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wait4 - wait4 i:iWiP __wait4 wait4
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chown - chown i:sii __libc_chown __chown chown
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fchownat - fchownat i:isiii fchownat
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linkat - linkat i:isisi linkat
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mkdirat - mkdirat i:isi mkdirat
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readlinkat - readlinkat i:issi readlinkat
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symlinkat - symlinkat i:sis symlinkat
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unlinkat - unlinkat i:isi unlinkat
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setxattr - setxattr i:sspii setxattr
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lsetxattr - lsetxattr i:sspii lsetxattr
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fsetxattr - fsetxattr i:ispii fsetxattr
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getxattr - getxattr i:sspi getxattr
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lgetxattr - lgetxattr i:sspi lgetxattr
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fgetxattr - fgetxattr i:ispi fgetxattr
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listxattr - listxattr i:ssi listxattr
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llistxattr - llistxattr i:ssi llistxattr
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flistxattr - flistxattr i:isi flistxattr
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removexattr - removexattr i:ss removexattr
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lremovexattr - lremovexattr i:ss lremovexattr
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fremovexattr - fremovexattr i:is fremovexattr
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mq_setattr - mq_getsetattr i:ipp mq_setattr
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timerfd_create EXTRA timerfd_create i:ii timerfd_create
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timerfd_settime EXTRA timerfd_settime i:iipp timerfd_settime
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timerfd_gettime EXTRA timerfd_gettime i:ip timerfd_gettime
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fanotify_init EXTRA fanotify_init i:ii fanotify_init
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name_to_handle_at EXTRA name_to_handle_at i:isppi name_to_handle_at
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setns EXTRA setns i:ii setns
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process_vm_readv EXTRA process_vm_readv i:ipipii process_vm_readv
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process_vm_writev EXTRA process_vm_writev i:ipipii process_vm_writev
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memfd_create EXTRA memfd_create i:si memfd_create
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pkey_alloc EXTRA pkey_alloc i:ii pkey_alloc
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pkey_free EXTRA pkey_free i:i pkey_free
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gettid EXTRA gettid Ei: __gettid gettid
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tgkill EXTRA tgkill i:iii __tgkill tgkill
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