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gets()
—Reads a string from standard input.
Synopsis:
#include <stdio.h> 
char *gets(char *s); 
Arguments:
s
Pointer to array to store into.
Returns:
s
on success and NULL on failure.
Description:
Read characters from 
stdin
into the array pointed to by 
s
until a newline is read or
end-of-file is encountered. Any newline read is discarded and a null character is written after
the last character is read into the array.
Reference:
C 4.9.7.7 & P 8.2.3.5
Notes:
This function is not equivalent to 
fgets(stdin,s)
There is no checking to see if the input
characters fit in the array, and is thus very dangerous. Use 
fgets()
instead.
P
age 326
getuid()
—Gets real user ID.
Synopsis:
#include <sys/types.h> 
#include <unistd.h> 
uid_t getuid(void); 
Arguments:
None.
Returns:
Real user ID.
Description:
The 
getuid()
function returns the user ID of the calling process.
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Reference:
P 4.2.1.1
Conversion:
Add to the list of headers:
#include <unistd.h>
BSD returns 
int
.
SVR1-3 returns 
unsigned
short
.
Notes:
P
age 327
gmtime()
—Breaks down a timer value into a 
time
structure in
Coordinated Universal Time (UTC).
Synopsis:
#include <time.h> 
struct tm *gmtime(const time_t *timer); 
Arguments:
timer
time_t
returned by 
time()
.
Returns:
A pointer to a 
struct
tm
.
Description:
The 
gmtime()
function breaks down the time in the 
time_t
pointed to by 
timer
into year,
month, day, hours, minutes, seconds, etc., and stores the information in a 
struct
tm
. A
pointer to the 
struct
tm
is returned.
Reference:
C 4.12.3.3
Conversion:
BSD used the header 
<sys/time.h>
instead of 
<time.h>
.
BSD and SVR1-3 used long for timer.
Notes:
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See 
localtime()
.
See description on Page 133.
P
age 328
isalnum()
—Tests for alphabetic or numeric character.
Synopsis:
#include <ctype.h> 
int isalnum(int c); 
Arguments:
c
Character to be tested.
Returns:
Non-zero (true) if the argument is an uppercase or lowercase letter or a digit.
Description:
The call 
isalnum(c)
is equivalent to 
isalpha(c) || isdigit(c)
.
Reference:
C 4.3.1.1
Notes:
P
age 329
isalpha()
—Tests for alphabetic character.
Synopsis:
#include <ctype.h> 
int isalpha(int c); 
Arguments:
c
Character to be tested.
Returns:
Non-zero (true) if the argument is an uppercase or lowercase letter.
Description:
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The 
isalpha()
function returns true if the argument is an alphabetic character in the current
locale. In the "
C
" or "
POSIX
" locale 
isalpha(c)
is equivalent to 
isupper(c) ||
islower(c)
.
Reference:
C 4.3.1.2
Notes:
P
age 330
isatty()
—Determines if a file descriptor is associated with a terminal.
Synopsis:
#include <unistd.h> 
int isatty(int fildes); 
Arguments:
fildes
File descriptor to test.
Returns:
1
if 
fildes
refers to a terminal and zero if it does not.
Description:
The 
isatty()
function returns 
1
if 
fildes
is a valid file descriptor associated with a
terminal, zero otherwise.
Reference:
P 4.7.2.1
Conversion:
Add to the list of headers:
#include <unistd.h>
Notes:
P
age 331
iscntrl()
—Tests for control character.
Synopsis:
#include <ctype.h> 
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int iscntrl(int c); 
Arguments:
c
Character to be tested.
Returns:
Non-zero (true) if the argument is a control character.
Description:
The 
iscntrl()
function returns non-zero if the argument is a control character in the current
locale.
Reference:
C 4.3.1.3
Notes:
P
age 332
isdigit()
—Tests for decimal-digit character.
Synopsis:
#include <ctype.h> 
int isdigit(int c); 
Arguments:
c
Character to be tested.
Returns
:
Non-zero (true) if the argument is a decimal-digit character.
Description:
The 
isdigit()
returns non-zero if the argument is one of 
'0'
'1'
'2'
'3'
'4'
'5'
,
'6'
'7'
'8'
, or 
'9'
.
Reference:
C 4.3.1.4
Notes:
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age 333
isgraph()
—Tests for printing character.
Synopsis:
#include <ctype.h> 
int isgraph(int c); 
Arguments:
c
Character to be tested.
Returns:
Non-zero (true) if the argument is any printing character except space.
Description:
The 
isgrah()
function returns non-zero for any character except 
' '
.
Reference:
C 4.3.1.5
Conversion:
Not supported in BSD 4.2, but added in 4.3.
Notes:
P
age 334
islower()
—Tests for lowercase character.
Synopsis:
#include <ctype.h> 
int islower(int c); 
Arguments:
c
Character to be tested.
Returns:
Non-zero (true) if the argument is a lowercase letter.
Description:
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The 
islower()
function returns non-zero if the argument is a lowercase letter in the current
locale.
Reference:
C 4.3.1.6
Notes:
P
age 335
isprint()
—Tests for printing character.
Synopsis:
#include <ctype.h> 
int isprint(int c); 
Arguments:
c
Character to be tested.
Returns:
Non-zero (true) if the argument is any printing character including space.
Description:
The 
isprint()
function tests for any printing character including a space in the current
locale.
Reference:
C 4.3.1.7
Notes:
P
age 336
ispunct()
—Tests for punctuation.
Synopsis:
#include <ctype.h> 
int ispunct(int c); 
Arguments:
c
Character to be tested.
Returns:
Non-zero (true) if the argument is an printing character which is not a space, an uppercase
letter, a lowercase letter, or a digit.
Description:
The call 
ispunct(c)
is equivalent to 
((c != ' ') && !isalnum(c))
Reference:
C 4.3.1.8
Notes:
P
age 337
isspace()
—Tests for white-space character.
Synopsis:
#include <ctype.h> 
int isspace(int c); 
Arguments:
c
Character to be tested.
Returns:
Non-zero (true) if the argument is a standard or implementation defined white-space character.
Description:
The 
isspace()
function returns non-zero if the argument is a white-space character in the
current locale. In the "
C
" or "
POSIX
" locales, the white-space characters are: space,
form-feed ('
\f
'
)
, newline ('
\n
'), carriage return ('
\r
'), horizontal tab ('
\t
'),
and vertical tab
('
\v
').
Reference:
C 4.3.1.9
Notes:
P
age 338
isupper()
—Tests for uppercase alphabetic character.
Synopsis:
#include <ctype.h> 
int isupper(int c); 
Arguments:
c
Character to be tested.
Returns:
Non-zero (true) if the argument is an uppercase letter.
Description:
The call 
isupper(c)
is equivalent to 
(!iscntrl(c) && !isdigit(c) &&
!ispunct(c) && !isspace(c)).
Reference:
C 4.3.1.10
Notes:
P
age 339
isxdigit()
—Tests for hexadecimal-digit character.
Synopsis:
#include <ctype.h> 
int isxdigit(int c); 
Arguments:
c
Character to be tested.
Returns:
Non-zero (true) if the argument is one of:
0123456789abcdefABCDEF
Description:
The 
isxdigit()
function returns non-zero if the argument is one of:
0123456789abcdefABCDEF
Reference:
C 4.3.1.11
Conversion:
Not supported in BSD 4.2, but added in 4.3.
Notes:
P
age 340
kill()
—Sends a signal to a process.
Synopsis:
#include <sys/types.h> 
#include <signal.h> 
int kill(pid_t pid, int sig); 
Arguments:
pid
Process ID of the process or processes to be signalled.
sig
Signal number to deliver.
Returns:
Zero on success and 
-1
on failure.
If an error occurs, a code is stored in 
errno
to identify the error.
Errors:
EINVAL, EPERM, ESRCH
Description:
The 
kill()
function sends a signal to a process or a group of processes specified by 
pid
. If
the signal is zero, error checking is performed but no signal is actually sent. This can be used to
check for a valid 
pid
.
If 
pid
is greater than zero, 
sig
is sent to the process whose process ID is 
pid
. If 
pid
is
negative, 
sig
is sent to all processes whose process group ID is equal to the absolute value of
pid
.
If the 
kill()
function causes a signal to be generated for the calling process, and if 
sig
is
not blocked, either 
sig
or another pending unblocked signal will be delivered before the
kill()
function returns.
Reference:
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