02-07-2010
This example works, I have a little more complicated comparison opperation. I have an index of IDs. These IDs are part of several substrings of a file. I want to see which IDs are in the file and which ones are not. Here are a few lines.
23873_ChemDiv_000A-0001
AVtclcactv01291016372D 0 0.00000 0.00000 1
31 34 0 0 0 0 0 0 0 0999 V2000
The ID is the first 5 characters of this string 23873_ChemDiv_000A-0001
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LEARN ABOUT FREEBSD
getresuid
SETRESUID(2) BSD System Calls Manual SETRESUID(2)
NAME
getresgid, getresuid, setresgid, setresuid -- get or set real, effective and saved user or group ID
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/types.h>
#include <unistd.h>
int
getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid);
int
getresuid(uid_t *ruid, uid_t *euid, uid_t *suid);
int
setresgid(gid_t rgid, gid_t egid, gid_t sgid);
int
setresuid(uid_t ruid, uid_t euid, uid_t suid);
DESCRIPTION
The setresuid() system call sets the real, effective and saved user IDs of the current process. The analogous setresgid() sets the real,
effective and saved group IDs.
Privileged processes may set these IDs to arbitrary values. Unprivileged processes are restricted in that each of the new IDs must match one
of the current IDs.
Passing -1 as an argument causes the corresponding value to remain unchanged.
The getresgid() and getresuid() calls retrieve the real, effective, and saved group and user IDs of the current process, respectively.
RETURN VALUES
Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the
error.
ERRORS
[EPERM] The calling process was not privileged and tried to change one or more IDs to a value which was not the current real ID,
the current effective ID nor the current saved ID.
[EFAULT] An address passed to getresgid() or getresuid() was invalid.
SEE ALSO
getegid(2), geteuid(2), getgid(2), getuid(2), issetugid(2), setgid(2), setregid(2), setreuid(2), setuid(2)
HISTORY
These functions first appeared in HP-UX.
BSD
February 7, 2015 BSD