M
msc
Hi guys,
How to get the user information like userid written in C
language.
How to get the user information like userid written in C
language.
M
Mark McIntyre
You can't do this in standard C - you'd have to use some operating
system specific extension.
Ask again in a group specialising in your compiler or OS, and consider
whether your OS stores this in the user's environment or something.
Mark McIntyre
K
Kenny McCormack
I.e.:
Not portable. Can't discuss it here. Blah, blah, blah.
F
Flash Gordon
msc said:
You can't in standard C so you will have to ask on a group dedicated to
your system.
R
Richard Heathfield
msc said:
If the information you seek is stored in environment variables, you can get
it using the ISO C standard function, getenv().
For example:
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
const char *user = getenv("USER");
if(user != NULL)
{
printf("User name: [%s]\n", user);
}
return 0;
}
The C Standard does not, of course, guarantee the existence or semantics of
particular environment variables.
If the information you seek is stored in environment variables, you can get
it using the ISO C standard function, getenv().
For example:
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
const char *user = getenv("USER");
if(user != NULL)
{
printf("User name: [%s]\n", user);
}
return 0;
}
The C Standard does not, of course, guarantee the existence or semantics of
particular environment variables.
S
Stan Milam
Flash said:
True. Usually the operating system has some environment variable used
to identify the user. Under Windoze it is "username" and with UNIX it
is usually "LOGNAME." So, look around on your operating system and
determine what environment variable is.
K
Keith Thompson
Stan Milam said:
This illustrates the dangers of posting partial system-specific
answers.
Though standard C provides no way to set or modify an environment
variable, many systems do. On such a system, using an environment
variable to identify a user allows a user to masquerade as someone
else. Whether this is a problem depends on the application.
Many systems provide ways to identify a user (whatever that happens to
mean) in a more reliable manner. See a system-specific newsgroup (or
your documentation) for more details.
K
Kenneth Brody
Stan said:
Ooh, goodie!
LOGNAME=root /path/to/program
or
set username=administrator
\path\to\program
You need to use a system-specific method to return this information, which
may or may not actually be available. (How does one get the username under
MS-DOS, for example?)
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