int open file in c
#include <unistd.h> #include <fcntl.h> int main() { int filedesc = open("testfile.txt", O_WRONLY | O_APPEND); if(filedesc < 0) return 1; if(write(filedesc,"This will be output to testfile.txt\n", 36) != 36) { write(2,"There was an error writing to testfile.txt\n"); // strictly not an error, it is allowable for fewer characters than requested to be written. return 1; } return 0; }