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LibC: Implement crappy version of pread()

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This patch adds a crappy pread() just to get "git" working locally.
A proper version would be implemented in the kernel so that we don't
have to mess with the file descriptor's offset at all.
This commit is contained in:
Andreas Kling 2020-02-20 06:59:23 +01:00
parent 7c12d66f61
commit cd495786a8
2 changed files with 11 additions and 0 deletions
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10
Libraries/LibC/unistd.cpp
View file

@ -702,6 +702,16 @@ int unveil(const char* path, const char* permissions)
__RETURN_WITH_ERRNO(rc, rc, -1); __RETURN_WITH_ERRNO(rc, rc, -1);
} }
ssize_t pread(int fd, void* buf, size_t count, off_t offset)
{
// FIXME: This is not thread safe and should be implemented in the kernel instead.
off_t old_offset = lseek(fd, 0, SEEK_CUR);
lseek(fd, offset, SEEK_SET);
ssize_t nread = read(fd, buf, count);
lseek(fd, old_offset, SEEK_SET);
return nread;
}
char* getpass(const char* prompt) char* getpass(const char* prompt)
{ {
dbg() << "FIXME: getpass(\"" << prompt << "\")"; dbg() << "FIXME: getpass(\"" << prompt << "\")";

1
Libraries/LibC/unistd.h
View file

@ -99,6 +99,7 @@ int setgid(gid_t);
pid_t tcgetpgrp(int fd); pid_t tcgetpgrp(int fd);
int tcsetpgrp(int fd, pid_t pgid); int tcsetpgrp(int fd, pid_t pgid);
ssize_t read(int fd, void* buf, size_t count); ssize_t read(int fd, void* buf, size_t count);
ssize_t pread(int fd, void* buf, size_t count, off_t);
ssize_t write(int fd, const void* buf, size_t count); ssize_t write(int fd, const void* buf, size_t count);
int close(int fd); int close(int fd);
int chdir(const char* path); int chdir(const char* path);