Carp (3pm)           - warn of errors (from perspective of caller)
Error (3pm)          - Error/exception handling in an OO-ish way
aio_error (3)        - get error status of asynchronous I/O operation
aio_error (3p)       - retrieve errors status for an asynchronous I/O operati...
APR::Error (3pm)     - Perl API for APR/Apache/mod_perl exceptions
assert_perror (3)    - test errnum and abort
cerf (3)             - complex error function
cerfc (3)            - complex error function
cerfcf (3)           - complex error function
cerfcl (3)           - complex error function
cerff (3)            - complex error function
cerfl (3)            - complex error function
clnt_pcreateerror (3) - library routines for remote procedure calls
clnt_perror (3)      - library routines for remote procedure calls
clnt_spcreateerror (3) - library routines for remote procedure calls
clnt_sperror (3)     - library routines for remote procedure calls
dbm_error (3p)       - database functions
dlerror (3)          - programming interface to dynamic linking loader
dlerror (3p)         - get diagnostic information
erf (3)              - error function
erf (3p)             - error functions
erfc (3)             - complementary error function
erfc (3p)            - complementary error functions
erfcf (3)            - complementary error function
erfcf (3p)           - complementary error functions
erfcl (3)            - complementary error function
erfcl (3p)           - complementary error functions
erff (3)             - error function
erff (3p)            - error functions
erfl (3)             - error function
erfl (3p)            - error functions
err (3)              - formatted error messages
errno (3)            - number of last error
errno (3p)           - error return value
errno.h (0p)         - system error numbers
error (3)            - glibc error reporting functions
Error::Simple (3pm)  - the simple error sub-class of Error
error_at_line (3)    - glibc error reporting functions
error_message_count (3) - glibc error reporting functions
error_on_per_line (3) - glibc error reporting functions
error_print_progname (3) - glibc error reporting functions
errstr (1ssl)        - lookup error codes
errx (3)             - formatted error messages
ferror (1)           - print a stack trace when the given message is printed ...
ferror (3)           - check and reset stream status
ferror (3p)          - test error indicator on a stream
ferror_unlocked (3)  - nonlocking stdio functions
fmtmsg (3)           - print formatted error messages
fmtmsg (3p)          - display a message in the specified format on standard ...
function::errno_str (3stap) - Symbolic string associated with error code
function::error (3stap) - Send an error message
function::kernel_string2 (3stap) - Retrieves string from kernel memory with a...
function::user_string2 (3stap) - Retrieves string from user space with altern...
gai_strerror (3)     - network address and service translation
gai_strerror (3p)    - address and name information error description
gendiff (1)          - utility to aid in error-free diff file generation
h_errno (3p)         - error return value for network database operations
herror (3)           - get network host entry
hstrerror (3)        - get network host entry
IPC::Open3 (3pm)     - open a process for reading, writing, and error handlin...
ldns_get_errorstr_by_id (3) - (unknown subject)
Mail::SpamAssassin::Logger::Stderr (3pm) - log to standard error
math_error (7)       - detecting errors from mathematical functions
ntfsfix (8)          - fix common errors and force Windows to check NTFS
perror (1)           - explain error codes
perror (3)           - print a system error message
perror (3p)          - write error messages to standard error
Pod::Checker (3pm)   - check pod documents for syntax errors
Pod::Perldoc::ToChecker (3pm) - let Perldoc check Pod for errors
probe::ipmib.InAddrErrors (3stap) - Count arriving packets with an incorrect ...
regerror (3)         - POSIX regex functions
regerror (3p)        - regular expression matching
smp_rep_phy_err_log (8) - invoke REPORT PHY ERROR LOG SMP function
strerror (3)         - return string describing error number
strerror (3p)        - get error message string
strerror_r (3)       - return string describing error number
strerror_r (3p)      - get error message string
sys_errlist (3)      - print a system error message
sys_nerr (3)         - print a system error message
syslog.h (0p)        - definitions for system error logging
libunbound (3)       - Unbound DNS validating resolver 1.4.13 functions.
unbound-checkconf (8) - Check unbound configuration file for errors.
verr (3)             - formatted error messages
verrx (3)            - formatted error messages
vwarn (3)            - formatted error messages
vwarnx (3)           - formatted error messages
warn (3)             - formatted error messages
warnx (3)            - formatted error messages