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diff --git a/reference/C/MAN/setuid.htm b/reference/C/MAN/setuid.htm new file mode 100644 index 0000000..f6551d3 --- /dev/null +++ b/reference/C/MAN/setuid.htm @@ -0,0 +1,99 @@ +<TITLE>setuid</TITLE> +<body bgcolor="#ffffcc"> +<hr> +<pre> + + + +<h3>SETUID(2) Linux Programmer's Manual SETUID(2) +</h3> + +<h3>NAME +</h3> setuid - set user identity + +<h3>SYNOPSIS +</h3> #include <unistd.h> + + int setuid(uid_t uid) + +<h3>DESCRIPTION +</h3> setuid sets the effective user ID of the current process. + If the caller is the superuser, the real and saved user + ID's are also set. + + Under Linux, setuid is implemented like SYSV with + SAVED_IDS. This allows a setuid (other than root) program + to drop all of it's user privileges, do some un-privileged + work, and then re-engage the original effective user ID in + a secure manner. + + If the user is root or the program is setuid root, special + care must be taken. The setuid function checks the effec- + tive uid of the caller and if it is the superuser, all + process related user ID's are set to uid. After this has + occurred, it is impossible for the program to regain root + privileges. + +<h3>RETURN VALUE +</h3> On success, zero is returned. On error, -1 is returned, + and errno is set appropriately. + +<h3>ERRORS +</h3> EPERM The user is not the super-user, and uid does not + match the effective or saved user ID of the call- + ing process. + +<h3>CONFORMING TO +</h3> System V + +</pre> +<hr> +<h3>SEE ALSO +</h3><p> +<a href=getuid.htm>getuid</a>, +<a href=setreuid.htm>setreuid</a>, +<a href=seteuid.htm>seteuid</a>, +<pre> + + + + + + + + + + + + + + + + + +<h3>Linux 1.1.36 29 July 1994 1 +</h3> + +
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