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// This file implements all missing symbols that should exist in normal API 21
// libc.a but missing in our extremely lean libc.a replacements.
#include <cstdlib>
#include <cstring>
#include <cerrno>
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#include <mntent.h>
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#include <unistd.h>
#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
// 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) {
char *ptr, *eptr;
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if (*buf == nullptr || *bufsiz == 0) {
*bufsiz = BUFSIZ;
if ((*buf = (char *) malloc(*bufsiz)) == nullptr)
return -1;
}
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for (ptr = *buf, eptr = *buf + *bufsiz;;) {
int c = fgetc(fp);
if (c == -1) {
if (feof(fp))
return ptr == *buf ? -1 : ptr - *buf;
else
return -1;
}
*ptr++ = c;
if (c == delimiter) {
*ptr = '\0';
return ptr - *buf;
}
if (ptr + 2 >= eptr) {
char *nbuf;
size_t nbufsiz = *bufsiz * 2;
ssize_t d = ptr - *buf;
if ((nbuf = (char *) realloc(*buf, nbufsiz)) == nullptr)
return -1;
*buf = nbuf;
*bufsiz = nbufsiz;
eptr = nbuf + nbufsiz;
ptr = nbuf + d;
}
}
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}
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ssize_t getline(char **buf, size_t *bufsiz, FILE *fp) {
return getdelim(buf, bufsiz, '\n', fp);
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}
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FILE *setmntent(const char *path, const char *mode) {
return fopen(path, mode);
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}
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int endmntent(FILE *fp) {
if (fp != nullptr) {
fclose(fp);
}
return 1;
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}
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// Missing system call wrappers
int setns(int fd, int nstype) {
return syscall(__NR_setns, fd, nstype);
}
int unshare(int flags) {
return syscall(__NR_unshare, flags);
}
int accept4(int sockfd, struct sockaddr *addr, socklen_t *addrlen, int flags) {
return syscall(__NR_accept4, sockfd, addr, addrlen, flags);
}
int dup3(int oldfd, int newfd, int flags) {
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) {
return syscall(__NR_readlinkat, dirfd, pathname, buf, bufsiz);
}
int symlinkat(const char *target, int newdirfd, const char *linkpath) {
return syscall(__NR_symlinkat, target, newdirfd, linkpath);
}
int linkat(int olddirfd, const char *oldpath,
int newdirfd, const char *newpath, int flags) {
return syscall(__NR_linkat, olddirfd, oldpath, newdirfd, newpath, flags);
}
int inotify_init1(int flags) {
return syscall(__NR_inotify_init1, flags);
}
int faccessat(int dirfd, const char *pathname, int mode, int flags) {
return syscall(__NR_faccessat, dirfd, pathname, mode, flags);
}
#define SPLIT_64(v) (unsigned)((v) & 0xFFFFFFFF), (unsigned)((v) >> 32)
#if defined(__arm__)
// Why the additional 0 is required: https://man7.org/linux/man-pages/man2/syscall.2.html
int ftruncate64(int fd, off64_t length) {
return syscall(__NR_ftruncate64, fd, 0, SPLIT_64(length));
}
#elif defined(__i386__)
int ftruncate64(int fd, off64_t length) {
return syscall(__NR_ftruncate64, fd, SPLIT_64(length));
}
#endif
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#if !defined(__LP64__)
void android_set_abort_message(const char *) {}
// Original source: <android/legacy_signal_inlines.h>
int sigaddset(sigset_t *set, int signum) {
/* Signal numbers start at 1, but bit positions start at 0. */
int bit = signum - 1;
auto *local_set = (unsigned long *)set;
if (set == nullptr || bit < 0 || bit >= (int)(8 * sizeof(sigset_t))) {
errno = EINVAL;
return -1;
}
local_set[bit / LONG_BIT] |= 1UL << (bit % LONG_BIT);
return 0;
}
int sigemptyset(sigset_t *set) {
if (set == nullptr) {
errno = EINVAL;
return -1;
}
memset(set, 0, sizeof(sigset_t));
return 0;
}
#include "fortify.hpp"
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#endif
} // extern "C"