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perror(3) Library Functions Manual perror(3) NAME perror - Writes a message explaining the current setting of errno LIBRARY Standard C Library (libc.a, libc.so) SYNOPSIS #include <stdio.h> void perror( const char *string); STANDARDS Interfaces documented on this reference page conform to industry stan- dards as follows: perror(): ISO C, POSIX.1, XPG4, XPG4-UNIX Refer to the standards(5) reference page for more information about in- dustry standards and associated tags. PARAMETERS Points to a string containing the name of the program that caused the error. DESCRIPTION The perror() function writes a message on the standard error stream that describes the current setting of the external variable errno. The error message includes the string pointed to by the string parameter, followed by a : (colon), a blank, the system message string, and a new- line character. The string parameter string should point to the name of the program that caused the error. To get the system error message string for use by a program, as opposed to displaying it on standard error, use the strerror() function. For more information, see strerror(3). RELATED INFORMATION Routines: printf(3), strerror(3) Standards: standards(5) delim off perror(3)