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author | Rich Felker <dalias@aerifal.cx> | 2019-07-18 21:46:33 -0400 |
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committer | Rich Felker <dalias@aerifal.cx> | 2019-07-18 21:46:33 -0400 |
commit | dfc81828f7ab41da08f744c44117a1bb20a05749 (patch) | |
tree | 98f334767e4e146b96ba40dc5f094528003a18e9 | |
parent | 67bf602f14249ff1757c54f071faa3f778279c02 (diff) | |
download | musl-dfc81828f7ab41da08f744c44117a1bb20a05749.tar.gz musl-dfc81828f7ab41da08f744c44117a1bb20a05749.tar.bz2 musl-dfc81828f7ab41da08f744c44117a1bb20a05749.tar.xz musl-dfc81828f7ab41da08f744c44117a1bb20a05749.zip |
implement fstatat with SYS_statx, conditional on undersized kstat time
this commit adds a new backend for fstatat (and thereby the whole stat
family) using the SYS_statx syscall, but conditions the new code on
the kernel stat structure's time fields being smaller than time_t. in
principle that should make it all dead code at present, but mips64 has
a broken stat structure with 32-bit time fields despite having 64-bit
time_t elsewhere, so on mips64 it is a functional change that makes
post-Y2038 filesystem timestamps accessible.
whenever the 32-bit archs end up getting 64-bit time_t, regardless of
how that happens, the changes in this commit will automatically take
effect for them too.
-rw-r--r-- | src/stat/fstatat.c | 70 |
1 files changed, 68 insertions, 2 deletions
diff --git a/src/stat/fstatat.c b/src/stat/fstatat.c index 29d63343..31907e98 100644 --- a/src/stat/fstatat.c +++ b/src/stat/fstatat.c @@ -3,10 +3,65 @@ #include <string.h> #include <fcntl.h> #include <errno.h> +#include <stdint.h> +#include <sys/sysmacros.h> #include "syscall.h" #include "kstat.h" -int fstatat(int fd, const char *restrict path, struct stat *restrict st, int flag) +struct statx { + uint32_t stx_mask; + uint32_t stx_blksize; + uint64_t stx_attributes; + uint32_t stx_nlink; + uint32_t stx_uid; + uint32_t stx_gid; + uint16_t stx_mode; + uint16_t pad1; + uint64_t stx_ino; + uint64_t stx_size; + uint64_t stx_blocks; + uint64_t stx_attributes_mask; + struct { + int64_t tv_sec; + uint32_t tv_nsec; + int32_t pad; + } stx_atime, stx_btime, stx_ctime, stx_mtime; + uint32_t stx_rdev_major; + uint32_t stx_rdev_minor; + uint32_t stx_dev_major; + uint32_t stx_dev_minor; + uint64_t spare[14]; +} stx; + +static int fstatat_statx(int fd, const char *restrict path, struct stat *restrict st, int flag) +{ + struct statx stx; + + int ret = __syscall(SYS_statx, fd, path, flag, 0x7ff, &stx); + if (ret) return ret; + + *st = (struct stat){ + .st_dev = makedev(stx.stx_dev_major, stx.stx_dev_minor), + .st_ino = stx.stx_ino, + .st_mode = stx.stx_mode, + .st_nlink = stx.stx_nlink, + .st_uid = stx.stx_uid, + .st_gid = stx.stx_gid, + .st_rdev = makedev(stx.stx_rdev_major, stx.stx_rdev_minor), + .st_size = stx.stx_size, + .st_blksize = stx.stx_blksize, + .st_blocks = stx.stx_blocks, + .st_atim.tv_sec = stx.stx_atime.tv_sec, + .st_atim.tv_nsec = stx.stx_atime.tv_nsec, + .st_mtim.tv_sec = stx.stx_mtime.tv_sec, + .st_mtim.tv_nsec = stx.stx_mtime.tv_nsec, + .st_ctim.tv_sec = stx.stx_ctime.tv_sec, + .st_ctim.tv_nsec = stx.stx_ctime.tv_nsec, + }; + return 0; +} + +static int fstatat_kstat(int fd, const char *restrict path, struct stat *restrict st, int flag) { int ret; struct kstat kst; @@ -36,7 +91,7 @@ int fstatat(int fd, const char *restrict path, struct stat *restrict st, int fla #endif else ret = __syscall(SYS_fstatat, fd, path, &kst, flag); - if (ret) return __syscall_ret(ret); + if (ret) return ret; *st = (struct stat){ .st_dev = kst.st_dev, @@ -60,4 +115,15 @@ int fstatat(int fd, const char *restrict path, struct stat *restrict st, int fla return 0; } +int fstatat(int fd, const char *restrict path, struct stat *restrict st, int flag) +{ + int ret; + if (sizeof((struct kstat){0}.st_atime_sec) < sizeof(time_t)) { + ret = fstatat_statx(fd, path, st, flag); + if (ret!=-ENOSYS) return __syscall_ret(ret); + } + ret = fstatat_kstat(fd, path, st, flag); + return __syscall_ret(ret); +} + weak_alias(fstatat, fstatat64); |