The perror() function produces a message on standard error describing the last error encountered during a call to a system or library function. First (if s is not NULL and *s is not a null byte ('\0')), the argument string s is printed, followed by a colon and a blank.

2016年1月11日 · You use perror() to print a message to stderr that corresponds to errno. You use fprintf() to print anything to stderr , or any other stream. perror() is a very specialized printing function:

2021年6月20日 · Prints a textual description of the error code currently stored in the system variable errno to stderr. The description is formed by concatenating the following components: …

The C library perror() function is designed to print a descriptive error message to the standard error stream (stderr), which helps in debugging and understanding what went wrong in your program. Syntax

2025年2月3日 · The perror() function in C displays a custom error message based on the error code stored in the errno variable when a system call fails.

C 库函数 void perror(const char *str) 把一个描述性错误消息输出到标准错误 stderr。 首先输出字符串 str ，后跟一个冒号，然后是一个空格。 声明

errno is an integral variable whose value describes the error condition or diagnostic information produced by a call to a library function (any function of the C standard library may set a value …

2022年12月1日 · perror prints the appropriate error message using the errno value as an index to _sys_errlist. The value of the variable _sys_nerr is defined as the maximum number of …

2015年12月5日 · perror. The general purpose of the function is to halt the execution process due to an error. The error message produced by perror is platform-depend. You can also print your own error message also. printf. The general purpose of the function is to print message user defined and continue the execution.

The perror() function prints an error message to stderr. If string is not NULL and does not point to a null character, the string pointed to by string is printed to the standard error stream, followed by a colon and a space.