perror, strerror, sys_errlist, sys_nerr - system error mes-
S
\bSY
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\bNO
\bOP
\bPS
\bSI
\bIS
\bS
p
\bpe
\ber
\brr
\bro
\bor
\br(
\b(s
\bst
\btr
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\bin
\bng
\bg)
\b)
c
\bch
\bha
\bar
\br *
\b*s
\bst
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\bin
\bng
\bg;
\b;
s
\bst
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\bre
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\br(
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\bum
\bm)
\b)
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\bin
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\ber
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\bm;
\b;
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\bo,
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\br;
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e
\bex
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\bn c
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\br *
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\bDE
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\bIO
\bON
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_
\bP_
\be_
\br_
\br_
\bo_
\br produces a short error message on the standard error
file describing the last error encountered during a call to
the system from a C program. If _
\bs_
\bt_
\br_
\bi_
\bn_
\bg is non-NULL, it is
printed, followed by a colon, followed by a space, followed
by the message and a new-line. Otherwise, just the message
and the new-line are printed. Most usefully, the argument
string is the name of the program which incurred the error.
The error number is taken from the external variable _
\be_
\br_
\br_
\bn_
\bo
(see _
\bi_
\bn_
\bt_
\br_
\bo(2)), which is set when errors occur but not
cleared when non-erroneous calls are made.
To simplify variant formatting of messages, the _
\bs_
\bt_
\br_
\be_
\br_
\br_
\bo_
\br
function returns a pointer to the error message string
mapped to the error number _
\be_
\br_
\br_
\bn_
\bu_
\bm.
The message strings can be accessed directly using the
external character array _
\bs_
\by_
\bs__
\be_
\br_
\br_
\bl_
\bi_
\bs_
\bt. _
\bS_
\by_
\bs__
\bn_
\be_
\br_
\br is the total
number of messages in the array. The use of these variables
is deprecated; _
\bs_
\bt_
\br_
\be_
\br_
\br_
\bo_
\br should be used instead.
S
\bSE
\bEE
\bE A
\bAL
\bLS
\bSO
\bO
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