The stdio.h header file declares functions that deal with standard input and output. One of these functions, fdopen(), is supported only in a POSIX program.
The stdio.h header file also declares these functions:
| clearerr() | clrmemf() | fclose() | fdelrec() | feof() |
| ferror() | fflush() | fgetc() | fgetpos() | fgets() |
| fldata() | flocate() | fopen() | fprintf() | fputc() |
| fputs() | fread() | freopen() | fscanf() | fseek() |
| fseeko() | fsetpos() | ftell() | ftello() | fupdate() |
| fwrite() | getc() | getchar() | gets() | perror() |
| printf() | putc() | putchar() | puts() | remove() |
| rename() | rewind() | scanf() | setbuf() | setvbuf() |
| sprintf() | sscanf() | svc99() | tmpfile() | tmpnam() |
| ungetc() | vfprintf() | vprintf() | vsprintf() |
The FILE type is defined in stdio.h. Stream functions use a pointer to the FILE type to get access to a given stream. The system uses the information in the FILE structure to maintain the stream. The C standard streams stdin, stdout, and stderr are also defined in stdio.h.
The type fpos_t is defined in stdio.h for use with fgetpos() and fsetpos().
The types __S99parms, __S99rbx_t, and __S99emparms_t are defined in stdio.h for use with the svc99() function.
The type fldata_t is defined in stdio.h for use with the fldata() function.
The types __amrc_type and __amrc2_type are defined in stdio.h for use in determining error information when I/O functions fail.
The macros SEEK_CUR, SEEK_END, and SEEK_SET expand to integral constant expressions and can be used as the third argument to fseek().
The macros _IOFBF, _IOLBF, and _IONBF expand to integral constant expressions with distinct values suitable for use as the third argument to the setvbuf() function.
The following macros expand to integer constant expressions suitable for interpreting values returned by fldata(), in the fldata_t structure.
| __APPEND | __BINARY | __BLOCKED | __DISK |
| __DUMMY | __ESDS | __ESDS_PATH | __HFS |
| __HIPERSPACE | __KSDS | __KSDS_PATH | __MEMORY |
| __MSGFILE | __NORLS | __NOTVSAM | __OTHER |
| __PRINTER | __READ | __RECORD | __RLS |
| __RSDS | __TAPE | __TDQ | __TERMINAL |
| __TEXT | __UPDATE | __WRITE |
The following macros expand to integral constant expressions suitable for use as the fourth argument to the flocate() function.
| __KEY_EQ | __KEY_EQ_BWD | __KEY_FIRST | __KEY_GE |
| __KEY_LAST | __RBA_EQ | __RBA_EQ_BWD |
The following macros expand to integral constant expressions suitable for use as the argument to the function clrmemf().
| __CURRENT | __CURRENT_LOWER | __LOWER |
The following macros expand to integral constant expressions suitable for use to determine the last operation reported in the __amrc_type structure. All these macros are described in z/OS XL C/C++ Programming Guide.
| __BSAM_BLDL | __BSAM_CLOSE | __BSAM_CLOSE_T |
| __BSAM_NOTE | __BSAM_OPEN | __BSAM_POINT |
| __BSAM_READ | __BSAM_STOW | __BSAM_WRITE |
| __C_CANNOT_EXTEND | __C_DBCS_SI_TRUNCATE | __C_DBCS_SO_TRUNCATE |
| __C_DBCS_TRUNCATE | __C_DBCS_UNEVEN | __C_FCBCHECK |
| __C_TRUNCATE | __CELMSGF_WRITE | __CICS_WRITEQ_TD |
| __HSP_CREATE | __HSP_DELETE | __HSP_EXTEND |
| __HSP_READ | __HSP_WRITE | __INTERCEPT_READ |
| __INTERCEPT_WRITE | __IO_CATALOG | __IO_DEVTYPE |
| __IO_INIT | __IO_LOCATE | __IO_OBTAIN |
| __IO_RDJFCB | __IO_RENAME | __IO_SCRATCH |
| __IO_TRKCALC | __IO_UNCATALOG | __LFS_CLOSE |
| __LFS_FSTAT | __LFS_LSEEK | __LFS_OPEN |
| __LFS_READ | __LFS_WRITE | __NOSEEK_REWIND |
| __OS_CLOSE | __OS_OPEN | __QSAM_FREEPOOL |
| __QSAM_GET | __QSAM_PUT | __QSAM_RELSE |
| __QSAM_TRUNC | __SVC99_ALLOC | __SVC99_ALLOC_NEW |
| __SVC99_UNALLOC | __TGET_READ | __TPUT_WRITE |
| __VSAM_CLOSE | __VSAM_ENDREQ | __VSAM_ERASE |
| __VSAM_GENCB | __VSAM_GET | __VSAM_MODCB |
| __VSAM_OPEN_ESDS | __VSAM_OPEN_ESDS_PATH | __VSAM_OPEN_FAIL |
| __VSAM_OPEN_KSDS | __VSAM_OPEN_KSDS_PATH | __VSAM_OPEN_RRDS |
| __VSAM_POINT | __VSAM_PUT | __VSAM_SHOWCB |
| __VSAM_TESTCB |