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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 {
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GLIBC_2.0 {
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# global variables
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___brk_addr; __curbrk; __progname; __progname_full;
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# interface of malloc functions
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__sbrk; __getpagesize;
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# functions used in other libraries
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__select;
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# variables in normal name space
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error_message_count; error_one_per_line; error_print_progname;
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# variables in normal name space
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loc1; loc2; locs;
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program_invocation_name; program_invocation_short_name;
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# a*
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acct; addmntent; advance;
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# b*
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brk;
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# c*
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chflags; chroot; closelog;
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# d*
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daemon; dirname;
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# e*
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ecvt; ecvt_r; endfsent; endmntent; endttyent; endusershell;
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# e*
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err; error; error_at_line; errx;
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# f*
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fchflags; fcvt; fcvt_r; fdatasync; fsync; ftruncate;
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# g*
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gcvt; get_avphys_pages; get_nprocs; get_nprocs_conf; get_phys_pages;
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getfsent; getfsfile; getfsspec; gethostid; gethostname; getmntent;
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getmntent_r; getpagesize; getpass; getttyent; getttynam; getusershell;
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gtty;
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# h*
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hasmntopt; hcreate; hcreate_r; hdestroy; hdestroy_r; hsearch; hsearch_r;
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# i*
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insque; ioctl;
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# j*
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jrand48; jrand48_r; lfind; lsearch;
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# m*
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madvise; mkstemp; mktemp; mlock; mlockall; mmap; mount; mprotect; msync;
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munlock; munlockall; munmap;
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# o*
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openlog;
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# p*
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ptrace;
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# q*
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qecvt; qecvt_r; qfcvt; qfcvt_r; qgcvt;
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# r*
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readv; reboot; remque; revoke;
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# s*
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sbrk; select; setdomainname; setfsent; sethostent; sethostid; sethostname;
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setlogmask; setmntent; setregid; setreuid; setttyent; setusershell; sstk;
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stty; sync; syscall; syslog;
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# t*
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tdelete; tfind; truncate; tsearch; ttyslot; twalk;
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# u*
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ualarm; usleep; ustat; utimes;
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# v*
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verr; verrx; vhangup; vsyslog; vwarn; vwarnx;
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# w*
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warn; warnx;
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# w*
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writev;
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}
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GLIBC_2.1 {
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# f*
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ftruncate64;
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# m*
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mmap64;
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# t*
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tdestroy; truncate64;
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}
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GLIBC_2.2 {
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# g*
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getloadavg;
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# m*
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mincore; mkdtemp; mkstemp64;
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# p*
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posix_madvise;
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}
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GLIBC_2.3 {
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# f*
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fgetxattr; flistxattr; fremovexattr; fsetxattr;
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futimes;
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# g*
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getxattr;
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# l*
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listxattr;
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lgetxattr; llistxattr; lremovexattr; lsetxattr;
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lutimes;
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# r*
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removexattr;
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# s*
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setxattr;
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}
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GLIBC_2.3.3 {
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remap_file_pages;
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}
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GLIBC_2.4 {
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futimesat;
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__syslog_chk; __vsyslog_chk;
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}
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GLIBC_2.7 {
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mkostemp; mkostemp64;
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}
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GLIBC_2.10 {
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preadv; preadv64; pwritev; pwritev64;
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}
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GLIBC_2.11 {
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mkstemps; mkstemps64; mkostemps; mkostemps64;
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}
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GLIBC_2.14 {
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syncfs;
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}
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GLIBC_2.16 {
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__getauxval; getauxval;
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}
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GLIBC_2.23 {
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# SHLIB_COMPAT(GLIBC_2_0, GLIBC_2_23) used in regexp.c
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}
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GLIBC_2.25 {
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gnu_dev_major; gnu_dev_minor; gnu_dev_makedev;
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}
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GLIBC_2.26 {
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preadv2; preadv64v2; pwritev2; pwritev64v2;
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}
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GLIBC_PRIVATE {
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__madvise;
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__mktemp;
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__libc_ifunc_impl_list;
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__tdelete; __tfind; __tsearch; __twalk;
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}
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}
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