2 * Operating System Interface
4 * This provides access to useful OS routines for the sandbox architecture.
5 * They are kept in a separate file so we can include system headers.
7 * Copyright (c) 2011 The Chromium OS Authors.
8 * SPDX-License-Identifier: GPL-2.0+
14 #include <linux/types.h>
19 * Access to the OS read() system call
21 * \param fd File descriptor as returned by os_open()
22 * \param buf Buffer to place data
23 * \param count Number of bytes to read
24 * \return number of bytes read, or -1 on error
26 ssize_t os_read(int fd, void *buf, size_t count);
29 * Access to the OS read() system call with non-blocking access
31 * \param fd File descriptor as returned by os_open()
32 * \param buf Buffer to place data
33 * \param count Number of bytes to read
34 * \return number of bytes read, or -1 on error
36 ssize_t os_read_no_block(int fd, void *buf, size_t count);
39 * Access to the OS write() system call
41 * \param fd File descriptor as returned by os_open()
42 * \param buf Buffer containing data to write
43 * \param count Number of bytes to write
44 * \return number of bytes written, or -1 on error
46 ssize_t os_write(int fd, const void *buf, size_t count);
49 * Access to the OS lseek() system call
51 * \param fd File descriptor as returned by os_open()
52 * \param offset File offset (based on whence)
53 * \param whence Position offset is relative to (see below)
54 * \return new file offset
56 off_t os_lseek(int fd, off_t offset, int whence);
58 /* Defines for "whence" in os_lseek() */
64 * Access to the OS open() system call
66 * \param pathname Pathname of file to open
67 * \param flags Flags, like O_RDONLY, O_RDWR
68 * \return file descriptor, or -1 on error
70 int os_open(const char *pathname, int flags);
75 #define OS_O_MASK 3 /* Mask for read/write flags */
76 #define OS_O_CREAT 0100
79 * Access to the OS close() system call
81 * \param fd File descriptor to close
82 * \return 0 on success, -1 on error
87 * Access to the OS exit() system call
89 * This exits with the supplied return code, which should be 0 to indicate
92 * @param exit_code exit code for U-Boot
94 void os_exit(int exit_code) __attribute__((noreturn));
97 * Put tty into raw mode to mimic serial console better
99 void os_tty_raw(int fd);
102 * Acquires some memory from the underlying os.
104 * \param length Number of bytes to be allocated
105 * \return Pointer to length bytes or NULL on error
107 void *os_malloc(size_t length);
110 * Access to the usleep function of the os
112 * \param usec Time to sleep in micro seconds
114 void os_usleep(unsigned long usec);
117 * Gets a monotonic increasing number of nano seconds from the OS
119 * \return A monotonic increasing time scaled in nano seconds
121 uint64_t os_get_nsec(void);
124 * Parse arguments and update sandbox state.
126 * @param state Sandbox state to update
127 * @param argc Argument count
128 * @param argv Argument vector
129 * @return 0 if ok, and program should continue;
130 * 1 if ok, but program should stop;
131 * -1 on error: program should terminate.
133 int os_parse_args(struct sandbox_state *state, int argc, char *argv[]);
136 * Types of directory entry that we support. See also os_dirent_typename in
140 OS_FILET_REG, /* Regular file */
141 OS_FILET_LNK, /* Symbolic link */
142 OS_FILET_DIR, /* Directory */
143 OS_FILET_UNKNOWN, /* Something else */
148 /** A directory entry node, containing information about a single dirent */
149 struct os_dirent_node {
150 struct os_dirent_node *next; /* Pointer to next node, or NULL */
151 ulong size; /* Size of file in bytes */
152 enum os_dirent_t type; /* Type of entry */
153 char name[0]; /* Name of entry */
157 * Get a directionry listing
159 * This allocates and returns a linked list containing the directory listing.
161 * @param dirname Directory to examine
162 * @param headp Returns pointer to head of linked list, or NULL if none
163 * @return 0 if ok, -ve on error
165 int os_dirent_ls(const char *dirname, struct os_dirent_node **headp);
168 * Get the name of a directory entry type
170 * @param type Type to cehck
171 * @return string containing the name of that type, or "???" if none/invalid
173 const char *os_dirent_get_typename(enum os_dirent_t type);
176 * Get the size of a file
178 * @param fname Filename to check
179 * @return size of file, or -1 if an error ocurred
181 ssize_t os_get_filesize(const char *fname);