libauth: re-implement procsetuser() to use /proc instead of #c/user
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1 changed files with 22 additions and 8 deletions
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@ -5,16 +5,30 @@
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int
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int
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procsetuser(char *user)
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procsetuser(char *user)
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{
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{
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int fd, n;
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char name[32];
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Dir dir;
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fd = open("#c/user", OWRITE|OCEXEC);
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nulldir(&dir);
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if(fd < 0)
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dir.uid = user;
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return -1;
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snprint(name, sizeof(name), "/proc/%lud/ctl", (ulong)getpid());
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n = strlen(user);
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if(dirwstat(name, &dir) < 0){
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if(write(fd, user, n) != n){
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/*
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* this is backwards compatibility code as
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* devproc initially didnt allow changing
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* the user to none.
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*/
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int fd;
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if(strcmp(user, "none") != 0)
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return -1;
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fd = open("#c/user", OWRITE|OCEXEC);
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if(fd < 0)
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return -1;
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if(write(fd, "none", 4) != 4){
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close(fd);
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return -1;
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}
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close(fd);
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close(fd);
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return -1;
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}
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}
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close(fd);
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return 0;
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return 0;
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}
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}
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