mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-27 13:10:29 +00:00
52bd938169
This patch adds support of preadv2 and pwritev2 which are similar to preadv/pwritev but with an extra flag argument. As for preadv/pwritev both interfaces are added a non-standard GNU API. For default 'posix' implementation trying to emulate the Linux supported flags is troublesome: * We can not temporary change the file state of the O_DSYNC and O_SYNC flags to emulate RWF_{D}SYNC (attempts to change the state of using fcntl are silently ignored). * IOCB_HIPRI requires the file opened in O_DIRECT and uses an internal semantic not provided by any other flag (O_NONBLOCK for instance). So default sysdeps/posix implementations fails with EOPNOTSUPP for any non supported flag (which are none currently) calls generic preadv/pwritev. Basically this implementation supports only preadv2 called as preadv (with flags sets to 0). The Linux one uses the preadv2/pwritev2 syscall if defined, otherwise it call preadv/writev. Instead of using the previous __ASSUME_* to unconditionally issue the syscall (and avoid building the fallback routine), it call pread/write if the preadv2/pwritev2 syscalls fails. The idea is just avoid adding another __ASSUME_* and checking each architecture on every kernel bump and simplify code conditionals. Checked on x86_64-linux-gnu and on i686-linux-gnu and a check with run-built-tests=no on aarch64-linux-gnu, alpha-linux-gnu, arm-linux-gnueabihf, ia64-linux-gnu, m68k-linux-gnu, microblaze-linux-gnu, mips{64,64n32}-linux-gnu, nios2-linux-gnu, powerpc{64,64le}-linux-gnu, s390{x}-linux-gnu, sparc{64,v9}-linux-gnu, tile{gx,pro}-linux-gnu, and sh4-linux-gnu (all using gcc 6.3). * NEWS: Add note about pwritev2 and preadv2 inclusion. * misc/Makefile (routines): Add preadv2, preadv64v2, pwritev2, and pwritev64v2. (tests): Add tst-preadvwritev2 and tst-preadvwritev64v2. * misc/Versions (GLIBC_2.26): Add preadv2, preadv64v2, pwritev2, and pwritev64v2. * misc/preadv2.c: New file. * misc/preadv64v2.c: Likewise. * misc/pwritev2.c: Likewise. * misc/pwritev64v2.c: Likewise. * misc/tst-preadvwritev2.c: Likewise. * misc/tst-preadvwritev64v2.c: Likewise. * manual/llio.texi: Add preadv2 and pwritev2 documentation. * misc/sys/uio.h [__USE_GNU && !__USE_FILE_OFFSET64] (preadv2): New prototype. [__USE_GNU && !__USE_FILE_OFFSET64] (pwritev2): Likewise. [__USE_GNU && __USE_FILE_OFFSET64] (preadv64v2): Likewise. [__USE_GNU && __USE_FILE_OFFSET64] (pwritev64v2): Likewise. * misc/tst-preadvwritev-common.c (PREADV): Define if not defined. (PWRITEV): Likewise. (do_test_with_offset): Use PREADV and PWRITEV macros and check for ENOSYS. * nptl/tst-cancel4.c (tf_pwritev2): New test. (tf_preadv2): Likewise. (tf_fsync): Add tf_pwritev2 and tf_preadv2. * sysdeps/posix/preadv2.c: Likewise. * sysdeps/posix/preadv64v2.c: Likewise. * sysdeps/posix/pwritev2.c: Likewise. * sysdeps/posix/pwritev64v2.c: Likewise. * sysdeps/unix/sysv/linux/kernel-features.h: Add comment for syscall support in kernel. * sysdeps/unix/sysv/linux/preadv2.c: Likewise. * sysdeps/unix/sysv/linux/preadv64v2.c: Likewise. * sysdeps/unix/sysv/linux/pwritev2.c: Likewise. * sysdeps/unix/sysv/linux/pwritev64v2.c: Likewise. * sysdeps/unix/sysv/linux/preadv.c (preadv): Add libc_hidden_def. * sysdeps/unix/sysv/linux/preadv64.c (preadv64): Likewise. * sysdeps/unix/sysv/linux/pwritev.c (pwritev): Likewise. * sysdeps/unix/sysv/linux/pwritev64.c (pwritev64): Likewise. * sysdeps/unix/sysv/linux/bits/uio.h: Add supported preadv2/pwritev2 support flags on Linux. * sysdeps/unix/sysv/linux/aarch64/libc.abilist (GLIBC_2.26): Add preadv2, preadv64v2, pwritev2, pwritev64v2. * sysdeps/unix/sysv/linux/alpha/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/arm/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/hppa/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/i386/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/ia64/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/microblaze/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/nios2/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/sh/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/sysv/linux/tile/tilegx/tilegx32/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/sysv/linux/tile/tilegx/tilegx64/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/x86_64/64/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist (GLIBC_2.26): Likewise.
168 lines
3.0 KiB
Plaintext
168 lines
3.0 KiB
Plaintext
libc {
|
|
GLIBC_2.0 {
|
|
# global variables
|
|
___brk_addr; __curbrk; __progname; __progname_full;
|
|
|
|
# interface of malloc functions
|
|
__sbrk; __getpagesize;
|
|
|
|
# functions used in other libraries
|
|
__select;
|
|
|
|
# variables in normal name space
|
|
error_message_count; error_one_per_line; error_print_progname;
|
|
|
|
# variables in normal name space
|
|
loc1; loc2; locs;
|
|
program_invocation_name; program_invocation_short_name;
|
|
|
|
# a*
|
|
acct; addmntent; advance;
|
|
|
|
# b*
|
|
brk;
|
|
|
|
# c*
|
|
chflags; chroot; closelog;
|
|
|
|
# d*
|
|
daemon; dirname;
|
|
|
|
# e*
|
|
ecvt; ecvt_r; endfsent; endmntent; endttyent; endusershell;
|
|
|
|
# e*
|
|
err; error; error_at_line; errx;
|
|
|
|
# f*
|
|
fchflags; fcvt; fcvt_r; fdatasync; fsync; ftruncate;
|
|
|
|
# g*
|
|
gcvt; get_avphys_pages; get_nprocs; get_nprocs_conf; get_phys_pages;
|
|
getfsent; getfsfile; getfsspec; gethostid; gethostname; getmntent;
|
|
getmntent_r; getpagesize; getpass; getttyent; getttynam; getusershell;
|
|
gtty;
|
|
|
|
# h*
|
|
hasmntopt; hcreate; hcreate_r; hdestroy; hdestroy_r; hsearch; hsearch_r;
|
|
|
|
# i*
|
|
insque; ioctl;
|
|
|
|
# j*
|
|
jrand48; jrand48_r; lfind; lsearch;
|
|
|
|
# m*
|
|
madvise; mkstemp; mktemp; mlock; mlockall; mmap; mount; mprotect; msync;
|
|
munlock; munlockall; munmap;
|
|
|
|
# o*
|
|
openlog;
|
|
|
|
# p*
|
|
ptrace;
|
|
|
|
# q*
|
|
qecvt; qecvt_r; qfcvt; qfcvt_r; qgcvt;
|
|
|
|
# r*
|
|
readv; reboot; remque; revoke;
|
|
|
|
# s*
|
|
sbrk; select; setdomainname; setfsent; sethostent; sethostid; sethostname;
|
|
setlogmask; setmntent; setregid; setreuid; setttyent; setusershell; sstk;
|
|
stty; sync; syscall; syslog;
|
|
|
|
# t*
|
|
tdelete; tfind; truncate; tsearch; ttyslot; twalk;
|
|
|
|
# u*
|
|
ualarm; usleep; ustat; utimes;
|
|
|
|
# v*
|
|
verr; verrx; vhangup; vsyslog; vwarn; vwarnx;
|
|
|
|
# w*
|
|
warn; warnx;
|
|
|
|
# w*
|
|
writev;
|
|
}
|
|
GLIBC_2.1 {
|
|
# f*
|
|
ftruncate64;
|
|
|
|
# m*
|
|
mmap64;
|
|
|
|
# t*
|
|
tdestroy; truncate64;
|
|
}
|
|
GLIBC_2.2 {
|
|
# g*
|
|
getloadavg;
|
|
|
|
# m*
|
|
mincore; mkdtemp; mkstemp64;
|
|
|
|
# p*
|
|
posix_madvise;
|
|
}
|
|
GLIBC_2.3 {
|
|
# f*
|
|
fgetxattr; flistxattr; fremovexattr; fsetxattr;
|
|
futimes;
|
|
|
|
# g*
|
|
getxattr;
|
|
|
|
# l*
|
|
listxattr;
|
|
lgetxattr; llistxattr; lremovexattr; lsetxattr;
|
|
lutimes;
|
|
|
|
# r*
|
|
removexattr;
|
|
|
|
# s*
|
|
setxattr;
|
|
}
|
|
GLIBC_2.3.3 {
|
|
remap_file_pages;
|
|
}
|
|
GLIBC_2.4 {
|
|
futimesat;
|
|
__syslog_chk; __vsyslog_chk;
|
|
}
|
|
GLIBC_2.7 {
|
|
mkostemp; mkostemp64;
|
|
}
|
|
GLIBC_2.10 {
|
|
preadv; preadv64; pwritev; pwritev64;
|
|
}
|
|
GLIBC_2.11 {
|
|
mkstemps; mkstemps64; mkostemps; mkostemps64;
|
|
}
|
|
GLIBC_2.14 {
|
|
syncfs;
|
|
}
|
|
GLIBC_2.16 {
|
|
__getauxval; getauxval;
|
|
}
|
|
GLIBC_2.23 {
|
|
# SHLIB_COMPAT(GLIBC_2_0, GLIBC_2_23) used in regexp.c
|
|
}
|
|
GLIBC_2.25 {
|
|
gnu_dev_major; gnu_dev_minor; gnu_dev_makedev;
|
|
}
|
|
GLIBC_2.26 {
|
|
preadv2; preadv64v2; pwritev2; pwritev64v2;
|
|
}
|
|
GLIBC_PRIVATE {
|
|
__madvise;
|
|
__mktemp;
|
|
__libc_ifunc_impl_list;
|
|
__tdelete; __tfind; __tsearch; __twalk;
|
|
}
|
|
}
|