MarcoBuster/Magisk
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Proper xxread and xwrite implementation

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This commit is contained in:
topjohnwu 2021-01-17 01:42:45 -08:00
parent 1f4c595cd3
commit 79140c7636
2 changed files with 23 additions and 9 deletions
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2
gradle.properties
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@ -27,6 +27,6 @@ android.injected.testOnly=false
kapt.incremental.apt=true
# Magisk
magisk.versionCode=21303
magisk.versionCode=21304
magisk.ndkVersion=21d
magisk.fullNdkVersion=21.3.6528147

30
native/jni/utils/xwrap.cpp
View File

@ -61,12 +61,24 @@ int xopenat(int dirfd, const char *pathname, int flags, mode_t mode) {
return fd;
}
// Write exact same size as count
ssize_t xwrite(int fd, const void *buf, size_t count) {
int ret = write(fd, buf, count);
if (count != ret) {
PLOGE("write");
size_t write_sz = 0;
ssize_t ret;
do {
ret = write(fd, (byte *) buf + write_sz, count - write_sz);
if (ret < 0) {
if (errno == EINTR)
continue;
PLOGE("write");
return ret;
}
write_sz += ret;
} while (write_sz != count && ret != 0);
if (write_sz != count) {
PLOGE("write (%zu != %zu)", count, write_sz);
}
return ret;
return write_sz;
}
// Read error other than EOF
@ -81,15 +93,17 @@ ssize_t xread(int fd, void *buf, size_t count) {
// Read exact same size as count
ssize_t xxread(int fd, void *buf, size_t count) {
size_t read_sz = 0;
int ret = -1;
while (read_sz != count && ret != 0) {
ret = read(fd, buf, count);
ssize_t ret;
do {
ret = read(fd, (byte *) buf + read_sz, count - read_sz);
if (ret < 0) {
if (errno == EINTR)
continue;
PLOGE("read");
return ret;
}
read_sz += ret;
}
} while (read_sz != count && ret != 0);
if (read_sz != count) {
PLOGE("read (%zu != %zu)", count, read_sz);
}