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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-26 16:38:00 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-26 16:38:00 -0400
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treeb460cd850d0537eb71806ba30358840377b27688 /static/v10/man3/perror.3
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-.th PERROR III 11/5/73
-.sh NAME
-perror \*- system error messages
-.sh SYNOPSIS
-.ft B
-perror(s)
-.br
-char *s;
-.s3
-int sys\*_nerr;
-.br
-char *sys\*_errlist[];
-.s3
-int errno;
-.ft R
-.br
-.sh DESCRIPTION
-.it Perror
-produces a short error message
-describing the last error encountered during a call
-to the system from a C program.
-First the argument string
-.it s
-is printed, then a colon, then the message and a new-line.
-Most usefully, the argument string is the name
-of the program which incurred the error.
-The error number is taken from the external variable
-.it errno,
-which is set when errors occur but not cleared when
-non-erroneous calls are made.
-.s3
-To simplify variant formatting
-of messages, the vector of message strings
-.it sys\*_errlist
-is provided;
-.it errno
-can be used as an index in this table to get the
-message string without the newline.
-.it Sys\*_nerr
-is the largest message number provided for in the table;
-it should be checked because new
-error codes may be added to the system before
-they are added to the table.
-.sh "SEE ALSO"
-Introduction to System Calls
-.sh BUGS