This is needed for stat'ing loop devices > 255 since otherwise kernel returns EOVERFLOW becasue it needs st_rdev/st_dev to be larger than 16bits but in kernel it uses __old_kernel_stat for stat syscall which has st_rdev/st_dev as unsigned short
Add a testcase Signed-off-by: Khem Raj <[email protected]> --- libc/sysdeps/linux/common/stat.c | 12 +++++++++--- test/stat/stat-loop256.c | 32 ++++++++++++++++++++++++++++++++ 2 files changed, 41 insertions(+), 3 deletions(-) create mode 100644 test/stat/stat-loop256.c diff --git a/libc/sysdeps/linux/common/stat.c b/libc/sysdeps/linux/common/stat.c index a6ab291..5850266 100644 --- a/libc/sysdeps/linux/common/stat.c +++ b/libc/sysdeps/linux/common/stat.c @@ -14,18 +14,24 @@ #define __NR___syscall_stat __NR_stat #undef stat -static __inline__ _syscall2(int, __syscall_stat, - const char *, file_name, struct kernel_stat *, buf) int stat(const char *file_name, struct stat *buf) { int result; +#ifdef __NR_stat64 + struct kernel_stat64 kbuf; + result = INLINE_SYSCALL(stat64, 2, file_name, &kbuf); + if (result == 0) { + __xstat32_conv(&kbuf, buf); + } +#else struct kernel_stat kbuf; - result = __syscall_stat(file_name, &kbuf); + result = INLINE_SYSCALL(stat, 2, file_name, &kbuf); if (result == 0) { __xstat_conv(&kbuf, buf); } +#endif return result; } libc_hidden_def(stat) diff --git a/test/stat/stat-loop256.c b/test/stat/stat-loop256.c new file mode 100644 index 0000000..fad4962 --- /dev/null +++ b/test/stat/stat-loop256.c @@ -0,0 +1,32 @@ +#include <stdio.h> +#include <unistd.h> +#include <stdlib.h> +#include <sys/stat.h> +int main() +{ + struct stat statbuf; + int ret = 0; + char* loop255 = "/dev/loop255"; + char* loop256 = "/dev/loop256"; + mode_t mode = 0660; + mknod(loop255, mode, 0x7ff); + mknod(loop256, mode, 0x100700); + ret = stat(loop255, &statbuf); + if(ret < 0) { + printf("stat: Cant stat %s\n",loop255); + unlink(loop255); + exit(1); + } + ret = stat(loop256, &statbuf); + if(ret < 0) { + printf("stat: Cant stat %s\n",loop256); + unlink(loop255); + unlink(loop256); + exit(1); + } + + unlink(loop255); + unlink(loop256); + exit(0); +} + -- 1.7.5.4 _______________________________________________ uClibc mailing list [email protected] http://lists.busybox.net/mailman/listinfo/uclibc
