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Document the set*id functions. 

In particular, document the fact that they only affect the calling thread
on Android.

Bug: http://b/13134174
Test: ran tests
Change-Id: Ica6af451400d47e24358f59495ded63b2110eb8b
This commit is contained in:
Elliott Hughes 2018-08-28 12:17:20 -07:00
parent 4b9379c889
commit 9c6017778b
1 changed files with 93 additions and 14 deletions
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107
libc/include/unistd.h
View File

@ -26,8 +26,7 @@
* SUCH DAMAGE.
*/
#ifndef _UNISTD_H_
#define _UNISTD_H_
#pragma once
#include <stddef.h>
#include <sys/cdefs.h>
@ -102,20 +101,100 @@ int fexecve(int __fd, char* const* __argv, char* const* __envp) __INTRODUCED_IN(
int nice(int __incr);
int setuid(uid_t __uid);
uid_t getuid(void);
int seteuid(uid_t __uid);
uid_t geteuid(void);
int setgid(gid_t __gid);
gid_t getgid(void);
/**
* [setegid(2)](http://man7.org/linux/man-pages/man2/setegid.2.html) sets
* the effective group ID.
*
* On Android, this function only affects the calling thread, not all threads
* in the process.
*
* Returns 0 on success, and returns -1 and sets `errno` on failure.
*/
int setegid(gid_t __gid);
/**
* [seteuid(2)](http://man7.org/linux/man-pages/man2/seteuid.2.html) sets
* the effective user ID.
*
* On Android, this function only affects the calling thread, not all threads
* in the process.
*
* Returns 0 on success, and returns -1 and sets `errno` on failure.
*/
int seteuid(uid_t __uid);
/**
* [setgid(2)](http://man7.org/linux/man-pages/man2/setgid.2.html) sets
* the group ID.
*
* On Android, this function only affects the calling thread, not all threads
* in the process.
*
* Returns 0 on success, and returns -1 and sets `errno` on failure.
*/
int setgid(gid_t __gid);
/**
* [setregid(2)](http://man7.org/linux/man-pages/man2/setregid.2.html) sets
* the real and effective group IDs (use -1 to leave an ID unchanged).
*
* On Android, this function only affects the calling thread, not all threads
* in the process.
*
* Returns 0 on success, and returns -1 and sets `errno` on failure.
*/
int setregid(gid_t __rgid, gid_t __egid);
/**
* [setresgid(2)](http://man7.org/linux/man-pages/man2/setresgid.2.html) sets
* the real, effective, and saved group IDs (use -1 to leave an ID unchanged).
*
* On Android, this function only affects the calling thread, not all threads
* in the process.
*
* Returns 0 on success, and returns -1 and sets `errno` on failure.
*/
int setresgid(gid_t __rgid, gid_t __egid, gid_t __sgid);
/**
* [setresuid(2)](http://man7.org/linux/man-pages/man2/setresuid.2.html) sets
* the real, effective, and saved user IDs (use -1 to leave an ID unchanged).
*
* On Android, this function only affects the calling thread, not all threads
* in the process.
*
* Returns 0 on success, and returns -1 and sets `errno` on failure.
*/
int setresuid(uid_t __ruid, uid_t __euid, uid_t __suid);
/**
* [setreuid(2)](http://man7.org/linux/man-pages/man2/setreuid.2.html) sets
* the real and effective group IDs (use -1 to leave an ID unchanged).
*
* On Android, this function only affects the calling thread, not all threads
* in the process.
*
* Returns 0 on success, and returns -1 and sets `errno` on failure.
*/
int setreuid(uid_t __ruid, uid_t __euid);
/**
* [setuid(2)](http://man7.org/linux/man-pages/man2/setuid.2.html) sets
* the user ID.
*
* On Android, this function only affects the calling thread, not all threads
* in the process.
*
* Returns 0 on success, and returns -1 and sets `errno` on failure.
*/
int setuid(uid_t __uid);
uid_t getuid(void);
uid_t geteuid(void);
gid_t getgid(void);
gid_t getegid(void);
int getgroups(int __size, gid_t* __list);
int setgroups(size_t __size, const gid_t* __list);
int setreuid(uid_t __ruid, uid_t __euid);
int setregid(gid_t __rgid, gid_t __egid);
int setresuid(uid_t __ruid, uid_t __euid, uid_t __suid);
int setresgid(gid_t __rgid, gid_t __egid, gid_t __sgid);
int getresuid(uid_t* __ruid, uid_t* __euid, uid_t* __suid);
int getresgid(gid_t* __rgid, gid_t* __egid, gid_t* __sgid);
char* getlogin(void);
@ -239,9 +318,9 @@ int setdomainname(const char* __name, size_t __n) __INTRODUCED_IN(26);
void swab(const void* __src, void* __dst, ssize_t __byte_count) __INTRODUCED_IN(28);
#if defined(__BIONIC_INCLUDE_FORTIFY_HEADERS)
#define _UNISTD_H_
#include <bits/fortify/unistd.h>
#undef _UNISTD_H_
#endif
__END_DECLS
#endif