C - strerror() function

C strerror() function - Get error message string

Syntax:

char *strerror(int errnum)

The strerror() function is used to map the error number in errnum to an error message string.

Parameters:

Return value from strerror()

• Returns a pointer to the string.

Example: strerror() function.

#include <stdio.h>
#include <string.h>
#include <errno.h>
int main()
{
   FILE *stream;
    if ((stream = fopen("testt.txt", "r")) == NULL)
      printf("%s \n", strerror(errno));
    return 0; 
}

Output:

No such file or directory

Example: First fifty system error messages using strerror() function

#include <stdio.h>
#include <string.h>
#include <errno.h>
int main()
{
   FILE *stream;
    if ((stream = fopen("testt.txt", "r")) == NULL)
      printf("%s \n", strerror(errno));
    return 0; 
}

Output:

First 50 system error messages:
  1: Operation not permitted
  2: No such file or directory
  3: No such process
  4: Interrupted function call
  5: Input/output error
  6: No such device or address
  7: Arg list too long
  8: Exec format error
  9: Bad file descriptor
 10: No child processes
 11: Resource temporarily unavailable
 12: Not enough space
 13: Permission denied
 14: Bad address
 15: Unknown error
 16: Resource device
 17: File exists
 18: Improper link
 19: No such device
 20: Not a directory
 21: Is a directory
 22: Invalid argument
 23: Too many open files in system
 24: Too many open files
 25: Inappropriate I/O control operation
 26: Unknown error
 27: File too large
 28: No space left on device
 29: Invalid seek
 30: Read-only file system
 31: Too many links
 32: Broken pipe
 33: Domain error
 34: Result too large
 35: Unknown error
 36: Resource deadlock avoided
 37: Unknown error
 38: Filename too long
 39: No locks available
 40: Function not implemented
 41: Directory not empty
 42: Illegal byte sequence
 43: Unknown error
 44: Unknown error
 45: Unknown error
 46: Unknown error
 47: Unknown error
 48: Unknown error
 49: Unknown error
 50: Unknown error

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