perror
perror
Defined in header <stdio.h> | ||
|---|---|---|
void perror( const char *s ); |
Prints to stderr the contents of the null-terminated character string pointed to by s (unless s is a null pointer), followed by the two characters ": ", followed by the implementation-defined error message describing the error code currently stored in the system variable errno (identical to the output of strerror(errno)), followed by '\n'.
Parameters
| s | - | pointer to a null-terminated string with explanatory message |
Return value
(none).
Example
#include <stdio.h>
int main(void)
{
FILE* f = fopen("non_existent", "r");
if (f == NULL) {
perror("open()");
} else {
fclose(f);
}
}Output:
open(): No such file or directory
References
- C11 standard (ISO/IEC 9899:2011):
- 7.21.10.4 The perror function (p: 339)
- C99 standard (ISO/IEC 9899:1999):
- 7.19.10.4 The perror function (p: 305)
- C89/C90 standard (ISO/IEC 9899:1990):
- 4.9.10.4 The perror function
See also
|
(C11)(C11) | returns a text version of a given error code (function) |
C++ documentation for perror |
|
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