mirror of
https://github.com/topjohnwu/Magisk.git
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137 lines
3.9 KiB
C++
137 lines
3.9 KiB
C++
// This file implements all missing symbols that should exist in normal API 21
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// libc.a but missing in our extremely lean libc.a replacements.
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#include <cstdlib>
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#include <cstring>
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#include <cerrno>
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#include <mntent.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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extern "C" {
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/* Original source: https://github.com/freebsd/freebsd/blob/master/contrib/file/src/getline.c
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* License: BSD, full copyright notice please check original source */
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ssize_t getdelim(char **buf, size_t *bufsiz, int delimiter, FILE *fp) {
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char *ptr, *eptr;
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if (*buf == nullptr || *bufsiz == 0) {
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*bufsiz = BUFSIZ;
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if ((*buf = (char *) malloc(*bufsiz)) == nullptr)
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return -1;
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}
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for (ptr = *buf, eptr = *buf + *bufsiz;;) {
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int c = fgetc(fp);
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if (c == -1) {
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if (feof(fp))
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return ptr == *buf ? -1 : ptr - *buf;
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else
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return -1;
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}
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*ptr++ = c;
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if (c == delimiter) {
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*ptr = '\0';
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return ptr - *buf;
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}
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if (ptr + 2 >= eptr) {
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char *nbuf;
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size_t nbufsiz = *bufsiz * 2;
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ssize_t d = ptr - *buf;
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if ((nbuf = (char *) realloc(*buf, nbufsiz)) == nullptr)
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return -1;
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*buf = nbuf;
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*bufsiz = nbufsiz;
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eptr = nbuf + nbufsiz;
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ptr = nbuf + d;
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}
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}
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}
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ssize_t getline(char **buf, size_t *bufsiz, FILE *fp) {
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return getdelim(buf, bufsiz, '\n', fp);
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}
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/* Original source: https://android.googlesource.com/platform/bionic/+/master/libc/bionic/mntent.cpp
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* License: AOSP, full copyright notice please check original source */
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struct mntent *getmntent_r(FILE *fp, struct mntent *e, char *buf, int buf_len) {
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memset(e, 0, sizeof(*e));
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while (fgets(buf, buf_len, fp) != nullptr) {
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// Entries look like "proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0".
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// That is: mnt_fsname mnt_dir mnt_type mnt_opts 0 0.
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int fsname0, fsname1, dir0, dir1, type0, type1, opts0, opts1;
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if (sscanf(buf, " %n%*s%n %n%*s%n %n%*s%n %n%*s%n %d %d",
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&fsname0, &fsname1, &dir0, &dir1, &type0, &type1, &opts0, &opts1,
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&e->mnt_freq, &e->mnt_passno) == 2) {
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e->mnt_fsname = &buf[fsname0];
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buf[fsname1] = '\0';
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e->mnt_dir = &buf[dir0];
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buf[dir1] = '\0';
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e->mnt_type = &buf[type0];
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buf[type1] = '\0';
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e->mnt_opts = &buf[opts0];
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buf[opts1] = '\0';
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return e;
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}
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}
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return nullptr;
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}
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FILE *setmntent(const char *path, const char *mode) {
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return fopen(path, mode);
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}
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int endmntent(FILE *fp) {
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if (fp != nullptr) {
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fclose(fp);
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}
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return 1;
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}
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// Missing system call wrappers
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int setns(int fd, int nstype) {
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return syscall(__NR_setns, fd, nstype);
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}
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int unshare(int flags) {
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return syscall(__NR_unshare, flags);
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}
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int accept4(int sockfd, struct sockaddr *addr, socklen_t *addrlen, int flags) {
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return syscall(__NR_accept4, sockfd, addr, addrlen, flags);
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}
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int dup3(int oldfd, int newfd, int flags) {
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return syscall(__NR_dup3, oldfd, newfd, flags);
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}
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ssize_t readlinkat(int dirfd, const char *pathname, char *buf, size_t bufsiz) {
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return syscall(__NR_readlinkat, dirfd, pathname, buf, bufsiz);
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}
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int symlinkat(const char *target, int newdirfd, const char *linkpath) {
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return syscall(__NR_symlinkat, target, newdirfd, linkpath);
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}
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int linkat(int olddirfd, const char *oldpath,
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int newdirfd, const char *newpath, int flags) {
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return syscall(__NR_linkat, olddirfd, oldpath, newdirfd, newpath, flags);
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}
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int inotify_init1(int flags) {
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return syscall(__NR_inotify_init1, flags);
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}
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int faccessat(int dirfd, const char *pathname, int mode, int flags) {
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return syscall(__NR_faccessat, dirfd, pathname, mode, flags);
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}
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#if !defined(__LP64__)
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void android_set_abort_message(const char *msg) {}
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#endif
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} // extern "C"
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